Organic light emitting diode and organic light emitting device including same

Abstract

An organic light emitting diode and an organic light emitting device including the same are described. The organic light emitting diode includes: a first electrode; a second electrode facing the first electrode; and a first light emitting portion including a first blue light emitting material layer and positioned between the first electrode and the second electrode, the first blue light emitting material layer including a first blue light emitting layer and a second blue light emitting layer, wherein one of the first blue light emitting layer and the second blue light emitting layer includes a first p-type host represented by Formula 1 and a first n-type host represented by Formula 3 to provide exciplex characteristics, and the other of the first blue light emitting layer and the second blue light emitting layer includes a second p-type host represented by Formula 1 and a second n-type host represented by Formula 5 to provide delayed fluorescence characteristics.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2024 - 0010925, filed in Korea on January 24, 2024, which is hereby incorporated by reference in its entirety for all purposes. Technical field

[0003] The present disclosure relates to an organic light - emitting diode (OLED), and more particularly, to an organic light - emitting diode having an improved lifespan and an organic light - emitting device including the organic light - emitting diode. Background art

[0004] As the demand for display devices, especially display devices that occupy a small space, increases in various fields, organic light - emitting display devices (e.g., organic electroluminescent devices) including OLEDs have become the focus of recent research and development.

[0005] OLEDs can offer certain advantages over conventional display technologies. For example, organic light - emitting display devices can operate at low voltages, consume relatively less power, have excellent color, can be applied to flexible substrates, and can be provided in various sizes for various applications. Compared to liquid - crystal display (LCD) devices, OLED devices can have a wide viewing angle and high contrast, and do not require a backlight, making them lightweight and ultrathin.

[0006] An OLED is formed by disposing a plurality of intermediate layers such as a hole - injection layer, a hole - transport layer, a hole - transport assist layer, an electron - blocking layer, an electron - transport layer, an electron - injection layer, etc. between a cathode (electron - injection electrode) and an anode (hole - injection electrode). When a voltage is applied, an OLED emits light by injecting electrons from the cathode, which is an electron - injection electrode, and holes from the anode, which is a hole - injection electrode, into a light - emitting material layer (EML), where the electrons and holes combine to generate excitons, and the excitons emit light when transitioning from an excited state to a ground state.

[0007] Since fluorescent materials utilize only singlet excitons during the light - emitting process, there is a problem of low luminous efficiency. For example, in the case of fluorescent materials, only about 25% of the singlet excitons formed in the light - emitting layer are used to generate light, while 75% of the triplet excitons are mostly lost in the form of heat. Meanwhile, since phosphorescent materials use both triplet excitons and singlet excitons during the light - emitting process, they can exhibit high luminous efficiency. However, examples of phosphorescent materials include metal complexes, which have a short luminescence lifespan, which may be too short for commercial use.

[0008] Compared with conventional organic light-emitting diodes, there is still a technical need to improve the performance of organic light-emitting diodes by obtaining highly efficient phosphorescent dopant materials and applying hosts with optimal photophysical properties to improve the efficiency and lifetime of the device. SUMMARY OF THE INVENTION

[0009] Accordingly, one or more embodiments of the present disclosure relate to OLEDs and organic light-emitting devices that substantially eliminate one or more of the problems associated with the limitations and disadvantages of the related art.

[0010] One object of the present disclosure is to provide OLEDs and organic light-emitting devices having improved lifetimes.

[0011] Additional features and aspects will be set forth in the description which follows and in part will be apparent from the description, or may be learned by practice of the concepts of the present disclosure provided herein. Other features and aspects of the present disclosure concepts may be realized and obtained by means of the structures particularly pointed out in the written description or claims thereof as well as the appended drawings.

[0012] To achieve these and other advantages of the objects in accordance with one or more embodiments of the present disclosure, as described herein, one aspect of the present disclosure is an organic light-emitting diode including: a first electrode; a second electrode facing the first electrode; and a first light-emitting part including a first blue light-emitting material layer positioned between the first electrode and the second electrode, the first blue light-emitting material layer including a first blue light-emitting layer and a second blue light-emitting layer, wherein the first blue light-emitting layer contains a first p-type host, a first n-type host, and a first phosphorescent dopant, and the second blue light-emitting layer contains a second p-type host, a second n-type host, and a second phosphorescent dopant, wherein the first p-type host and the second p-type host are each independently represented by Formula 1:

[0013] [Formula 1]

[0014]

[0015] In Formula 1, a1 and a2 are each independently an integer from 0 to 4, n1 is 0 or 1. When a1 is 2 or greater, two or more R1s may be the same or different. When a2 is 2 or greater, two or more R2s may be the same or different. R1 and R2 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl.

[0016] M1 and M2 are each independently selected from Formula 1-1 and Formula 1-2:

[0017] [Formula 1-1]

[0018] and

[0019] [Formula 1-2]

[0020]

[0021] In Formula 1-1, a3 and a4 are each independently an integer from 0 to 4. When a3 is 2 or greater, two or more R3s may be the same or different. When a4 is 2 or greater, two or more R4s may be the same or different. R3 and R4 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl.

[0022] In Formula 1-2, a5, a7, a9, and a10 are each independently an integer from 0 to 4, a6 is an integer from 0 to 3, n2 is 0 or 1, when n2 is 0, a8 is an integer from 0 to 4, and when n2 is 1, a8 is an integer from 0 to 3. When a5 is 2 or greater, two or more R5s may be the same or different. When a6 is 2 or greater, two or more R6s may be the same or different. When a7 is 2 or greater, two or more R7s may be the same or different. When a8 is 2 or greater, two or more R8s may be the same or different. When a9 is 2 or greater, two or more R9s may be the same or different. When a10 is 2 or greater, two or more Rs 10 may be the same or different, and R5, R6, R7, R8, R9, and R 10 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl,

[0023] wherein the first n-type host is represented by Formula 3:

[0024] [Formula 3]

[0025]

[0026] In Formula 3, b1 is an integer from 0 to 4, b2, b3, and b4 are each independently an integer from 0 to 5. When b1 is 2 or greater, two or more Rs 21 may be the same or different. When b2 is 2 or greater, two or more Rs 22 may be the same or different. When b3 is 2 or greater, two or more Rs 23 may be the same or different. When b4 is 2 or greater, two or more Rs 24 may be the same or different. X2, X3, and X4 are each independently selected from N and CR 29 , and at least one of X2, X3, and X4 is N. R 21 , R 22 , R 23 and R 24Each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, R 29 Selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, Ar1 and Ar2 each independently selected from substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, and X5 is one of C, Si, and Ge,

[0027] Wherein the second n-type host is represented by Formula 5:

[0028] [Formula 5]

[0029]

[0030] In Formula 5, R 31 to R 41 One of them is represented by Formula 5-1, R 31 to R 41 At least one of them is represented by Formula 5-2, R 31 to R 41 The remainder of them are each independently selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, or optionally, R 31 to R 41The remaining adjacent ones among them combine to form a ring.

[0031] [Formula 5-1]

[0032] and

[0033] [Formula 5-2]

[0034]

[0035] In Formula 5-1, d0 is an integer from 0 to 4, d1, d2, and d3 are each independently an integer from 0 to 5. When d0 is 2 or greater, two or more Rs 50 are the same or different. When d1 is 2 or greater, two or more Rs 51 can be the same or different. When d2 is 2 or greater, two or more Rs 52 can be the same or different. When d3 is 2 or greater, two or more Rs 53 can be the same or different. R 50 、R 51 、R 52 and R 53 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, and X6 is one of C, Si, and Ge.

[0036] In Formula 5-2, n3 is 0 or 1, d4 and d6 are each independently an integer from 0 to 4, d5 is an integer from 0 to 2. When d4 is 2 or greater, two or more Rs 54 can be the same or different. When d5 is 2, two Rs 55 can be the same or different. When d6 is 2 or greater, two or more Rs 56 can be the same or different. R 54 、R 55 and R 56Each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, one of X7 and X8 is a single bond, and the other of X7 and X8 is selected from NR 57 、CR 58 R 59 、O and S, and R 57 、R 58 and R 59 Each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl.

[0037] In some embodiments, the first electrode is an anode, the second electrode is a cathode, and the second blue light-emitting layer is positioned between the first electrode and the first blue light-emitting layer.

[0038] In some embodiments, one of the first blue light-emitting layer and the second blue light-emitting layer contains a first p-type host represented by Formula 1 and a first n-type host represented by Formula 3 to provide exciplex characteristics, and the other of the first blue light-emitting layer and the second blue light-emitting layer contains a second p-type host represented by Formula 1 and a second n-type host represented by Formula 5 to provide delayed fluorescence characteristics. For example, one of the first blue light-emitting layer and the second blue light-emitting layer contains a first p-type host represented by Formula 2 as described below and a first n-type host represented by Formula 3a as described below to provide exciplex characteristics, and the other of the first blue light-emitting layer and the second blue light-emitting layer contains a second p-type host represented by Formula 2 as described below and a second n-type host represented by Formula 6 as described below to provide delayed fluorescence characteristics.

[0039] It should be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the claimed inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are included to provide a further understanding of the disclosure and which constitute a part of this application, illustrate some embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0041] Figure 1 is a schematic circuit diagram of an organic light emitting display device of the disclosure.

[0042] Figure 2 is a schematic cross-sectional view of an organic light emitting display device according to one or more embodiments of the disclosure.

[0043] Figure 3 is a schematic cross-sectional view of an OLED according to one or more embodiments of the disclosure.

[0044] Figure 4A and 4B is a diagram showing exciplex characteristics.

[0045] Figure 4C is a diagram illustrating the characteristics of a second p-type host and a second n-type host.

[0046] Figure 5 is a schematic cross-sectional view of an OLED according to one or more embodiments of the disclosure.

[0047] Figure 6 is a schematic cross-sectional view of an OLED according to one or more embodiments of the disclosure.

[0048] Figure 7 is a schematic cross-sectional view of an OLED according to one or more embodiments of the disclosure.

[0049] Figure 8 is a schematic cross-sectional view of an organic light emitting display device according to one or more embodiments of the disclosure.

[0050] Figure 9 is a schematic cross-sectional view of an organic light emitting display device according to one or more embodiments of the disclosure.

[0051] Figure 10 is a schematic cross-sectional view of an OLED according to one or more embodiments of the disclosure. Detailed Description

[0052] Reference will now be made in detail to aspects of the present disclosure, examples of which may be illustrated in the accompanying drawings. In the following description, when a detailed description of a known function or configuration related to this document makes the gist of the inventive concept unnecessarily obscure, its detailed description will be omitted. The described processing steps and / or operations are examples; however, except for steps and / or operations that must occur in a specific order, the order of steps and / or operations is not limited to the order set forth herein, but may be changed as known in the art. Throughout the text, the same reference numerals indicate the same elements. The names of the individual elements used in the following description are chosen only for the convenience of writing the specification and may thus be different from the names used in actual products. All components of all organic light emitting display devices according to all embodiments of the present disclosure are operably coupled and configured.

[0053] Advantages and features of the present disclosure and methods of achieving them will become apparent with reference to the aspects and the accompanying drawings described in detail below. However, the present disclosure is not limited to the aspects disclosed below, but may be implemented in various different forms, and only these aspects make the disclosure of the present disclosure complete. The present disclosure is provided to fully inform those skilled in the art of the field of the present disclosure of the scope of the present disclosure.

[0054] The shapes, sizes, proportions, angles, quantities, etc. disclosed in the accompanying drawings for illustrating aspects of the present disclosure are illustrative, and the present disclosure is not limited to the cases illustrated. Throughout the specification, the same reference numerals refer to the same elements. In addition, when describing the present disclosure, if it is determined that a detailed description of related known technologies makes the subject matter of the present disclosure unnecessarily obscure, its detailed description may be omitted. When using "comprising", "having", "consisting of", etc. in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, the case including the plural is also included unless a specific statement is described. In addition, the term "may" encompasses all meanings and scopes of the term "can".

[0055] When interpreting an element, although there is no clear description of the error or tolerance range, the element is interpreted as including such an error or tolerance range.

[0056] When describing a positional relationship, for example, when the positional relationship between two parts is described as, for example, "on", "above", "under", and "near", one or more other parts may be provided between the two parts unless a more restrictive term (such as "exactly" or "directly") is used.

[0057] When describing temporal relationships, for example, when a temporal order is described as, for example, "after", "subsequently", "then", and "before", discontinuous cases may be included unless more restrictive terms (such as "exactly", "immediately", or "directly") are used.

[0058] It will be understood that although the terms "first", "second", etc. may be used herein to describe multiple elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0059] The features of various aspects of the present disclosure may be partially or wholly coupled or combined with each other and may operate differently from each other and be technically driven as can be fully understood by those skilled in the art. The aspects of the present disclosure may be carried out independently of each other or may be carried out together in a mutually dependent relationship.

[0060] Reference will now be made in detail to some embodiments and some implementations shown in the accompanying drawings.

[0061] The present disclosure relates to an OLED in which adjacent blue light-emitting layers each have a different combination in terms of their compounds (materials), and an organic light-emitting device including the OLED. For example, the organic light-emitting device may be an organic light-emitting display device or an organic lighting device. As an example, an organic light-emitting display device including the OLED of the present disclosure will be mainly described.

[0062] Figure 1 is a schematic circuit diagram of the organic light-emitting display device of the present disclosure.

[0063] As Figure 1 shown, the organic light-emitting display device includes: a gate line GL, a data line DL, a power line PL, a switching thin-film transistor TFT Ts, a driving TFT Td, a storage capacitor Cst, and an OLED D. The gate line GL and the data line DL cross each other to define a pixel region P. The pixel region may include a red pixel region, a green pixel region, and a blue pixel region.

[0064] The switching TFT Ts is connected to the gate line GL and the data line DL, and the driving TFT Td and the storage capacitor Cst are connected to the switching TFT Ts and the power line PL. The OLED D is connected to the driving TFT Td.

[0065] In an organic light emitting display device, when a switching TFT Ts is turned on by a gate signal applied via a gate line GL, a data signal from a data line DL is applied to a gate electrode of a driving TFT Td and one electrode of a storage capacitor Cst.

[0066] When the driving TFT Td is turned on by the data signal, current is supplied from a power line PL to an OLED D. As a result, the OLED D emits light. In this case, when the driving TFT Td is turned on, the level of the current applied from the power line PL to the OLED D is determined such that the OLED D can generate gray levels.

[0067] The storage capacitor Cst is used to hold the voltage of the gate electrode of the driving TFT Td when the switching TFT Ts is turned off. Accordingly, even when the switching TFT Ts is turned off, the level of the current applied from the power line PL to the OLED D is maintained until the next frame.

[0068] Accordingly, the organic light emitting display device displays a desired image.

[0069] Figure 2 is a schematic cross-sectional view of an organic light emitting display device according to one or more embodiments of the present disclosure.

[0070] As Figure 2 shown, the organic light emitting display device 100 includes a substrate 110, a TFT Tr on or above the substrate 110, a planarization layer 150 covering the TFT Tr, and an OLED D on the planarization layer 150 and connected to the TFT Tr. A red pixel region, a green pixel region, and a blue pixel region may be defined on the substrate 110.

[0071] The substrate 110 may be a glass substrate or a flexible substrate. For example, the flexible substrate may be one of a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate, and a polycarbonate (PC) substrate.

[0072] A buffer layer 122 is formed on the substrate, and the TFT Tr is formed on the buffer layer 122. The buffer layer 122 may be omitted. For example, the buffer layer 122 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

[0073] A semiconductor layer 120 is formed on the buffer layer 122. The semiconductor layer 120 may include an oxide semiconductor material or polysilicon.

[0074] When the semiconductor layer 120 includes an oxide semiconductor material, a light-shielding pattern may be formed under the semiconductor layer 120. Light reaching the semiconductor layer 120 is blocked or obstructed by the light-shielding pattern, such that thermal degradation of the semiconductor layer 120 can be prevented. On the other hand, when the semiconductor layer 120 includes polysilicon, impurities may be doped into both sides of the semiconductor layer 120.

[0075] A gate insulating layer 124 is formed on the semiconductor layer 120. The gate insulating layer 124 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

[0076] A gate electrode 130 formed of a conductive material (e.g., metal) is formed on the gate insulating layer 124 corresponding to the center of the semiconductor layer 120. For example, the gate electrode 130 may be formed of a metal such as copper (Cu), molybdenum (Mo), titanium (Ti), aluminum (Al), gold (Au), or silver (Ag). The gate electrode 130 may have a single-layer structure or a multi-layer structure.

[0077] In Figure 2 the gate insulating layer 124 is formed on the entire surface of the substrate 110. Alternatively, the gate insulating layer 124 may be patterned to have the same shape as the gate electrode 130.

[0078] An interlayer insulating layer 132 is formed on the gate electrode 130 and above the entire surface of the substrate 110. The interlayer insulating layer 132 may be formed of an inorganic insulating material (e.g., silicon oxide or silicon nitride) or an organic insulating material (e.g., benzocyclobutene or photo-acryl).

[0079] The interlayer insulating layer 132 includes a first contact hole 134 and a second contact hole 136 that expose both sides of the semiconductor layer 120. The first contact hole 134 and the second contact hole 136 are positioned on both sides of the gate electrode 130 and spaced apart from the gate electrode 130.

[0080] The first contact hole 134 and the second contact hole 136 are formed to penetrate through the gate insulating layer 124 and the interlayer insulating layer 132. Alternatively, when the gate insulating layer 124 is patterned to have the same shape as the gate electrode 130, the first contact hole 134 and the second contact hole 136 are formed to penetrate only through the interlayer insulating layer 132.

[0081] A source electrode 144 and a drain electrode 146 formed of a conductive material (e.g., metal) are formed on the interlayer insulating layer 132. The source electrode 144 and the drain electrode 146 are spaced apart from each other with respect to the gate electrode 130, and contact both sides of the semiconductor layer 120 through the first contact hole 134 and the second contact hole 136, respectively.

[0082] For example, each of the source electrode 144 and the drain electrode 146 may be formed of a metal such as Cu, Mo, Ti, Al, Au, or Ag. Each of the source electrode 144 and the drain electrode 146 may have a single-layer structure or a multi-layer structure.

[0083] The semiconductor layer 120, the gate electrode 130, the source electrode 144, and the drain electrode 146 constitute the TFT Tr. The TFT Tr serves as a driving element. That is, the TFT Tr is the driving TFT Td of ( Figure 1 ).

[0084] In the TFT Tr, the gate electrode 130, the source electrode 144, and the drain electrode 146 are positioned above the semiconductor layer 120. That is, the TFT Tr has a coplanar structure.

[0085] Alternatively, in the TFT Tr, the gate electrode may be positioned below the semiconductor layer, and the source electrode and the drain electrode may be positioned above the semiconductor layer, such that the TFT Tr may have an inverted staggered structure. In this case, the semiconductor layer may include amorphous silicon.

[0086] In some embodiments, the gate line and the data line cross each other to define a pixel region, and the switching TFT is formed to be connected to the gate line and the data line. The switching TFT is connected to the TFT Tr that serves as a driving element. In addition, a power supply line and a storage capacitor may be formed. The power supply line may be formed to be parallel and spaced apart from one of the gate line and the data line. The storage capacitor is used to hold the voltage of the gate electrode of the TFT Tr in one frame.

[0087] The planarization layer 150 is formed on the entire surface of the substrate 110 to cover the source electrode 144 and the drain electrode 146. The planarization layer 150 provides a flat top surface and has a drain contact hole 152 that exposes the drain electrode 146 of the TFT Tr. The planarization layer 150 may be formed of an inorganic insulating material (e.g., silicon oxide or silicon nitride) or an organic insulating material (e.g., benzocyclobutene or photoacrylic).

[0088] The OLED D is disposed on the planarization layer 150 and includes a first electrode 210, an organic light-emitting layer 220, and a second electrode 230. The first electrode 210 is connected to the drain electrode 146 of the TFT Tr. The organic light-emitting layer 220 and the second electrode 230 are sequentially stacked on the first electrode 210. The OLED D is positioned in each of the red pixel region, the green pixel region, and the blue pixel region and emits red light, green light, and blue light, respectively.

[0089] The first electrode 210 is formed discretely in each pixel region. The first electrode 210 may be an anode and may include a transparent conductive oxide material layer, which may be formed of a conductive material having a relatively high work function, such as transparent conductive oxide (TCO). For example, the transparent conductive oxide material layer may be formed of one of the following: indium-tin-oxide (ITO), indium-zinc-oxide (IZO), indium-tin-zinc-oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium-copper-oxide (ICO), and aluminum-zinc-oxide (Al:ZnO, AZO).

[0090] The first electrode 210 may have a single-layer structure of a transparent conductive oxide material layer. That is, the first electrode 210 may be a transparent electrode.

[0091] Alternatively, the first electrode 210 may further include a reflective layer to have a bilayer structure or a trilayer structure. That is, the first electrode 210 may be a reflective electrode.

[0092] For example, the reflective layer may be formed of one of the following: silver (Ag), palladium (Pd), copper (Cu), indium (In), and an alloy of one of neodymium (Nd) and Ag, and an aluminum-palladium-copper (APC) alloy. For example, the first electrode 210 may have a bilayer structure of Ag / ITO or APC / ITO or a trilayer structure of ITO / Ag / ITO or ITO / APC / ITO.

[0093] In addition, a bank layer 160 is formed on the planarization layer 150 to cover the edge of the first electrode 210. That is, the bank layer 160 is positioned at the boundary of the pixel region and exposes the center of the first electrode 210 in the pixel region.

[0094] An organic light-emitting layer 220 including a light-emitting material layer (EML) is formed on the first electrode 210. The organic light-emitting layer 220 may further include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL) to have a multilayer structure.

[0095] In one aspect of the present disclosure, in the OLED D in the blue pixel region, the EML of the organic light-emitting layer 220 includes a first blue light-emitting layer and a second blue light-emitting layer.

[0096] In one aspect of the present disclosure, the organic light-emitting layer 220 of the OLED D in the blue pixel region may include a first blue light-emitting part and a second blue light-emitting part to have a tandem structure. The first blue light-emitting part includes a first blue EML, the second blue light-emitting part includes a second blue EML, and at least one of the first blue EML and the second blue EML may include a first blue light-emitting layer and a second blue light-emitting layer. In this case, the organic light-emitting layer 220 may further include a charge generation layer (CGL) between the first blue light-emitting part and the second blue light-emitting part.

[0097] As described below, in the OLED D in the blue pixel region, one of the first blue light-emitting layer and the second blue light-emitting layer includes a first host and a second host capable of providing delayed fluorescence characteristics, and a first phosphorescent dopant, and the other of the first blue light-emitting layer and the second blue light-emitting layer includes a third host and a fourth host capable of providing exciplex characteristics, and a second phosphorescent dopant. Therefore, the OLED and the organic light-emitting device including the same have improved lifetime.

[0098] For example, the first blue light-emitting layer closer to the first electrode serving as the anode includes a first host and a second host capable of providing delayed fluorescence characteristics, and a first phosphorescent dopant, and the second blue light-emitting layer closer to the second electrode serving as the cathode includes a third host and a fourth host capable of providing exciplex characteristics, and a second phosphorescent dopant.

[0099] A second electrode 230 is formed over the substrate 110 on which the organic light-emitting layer 220 is formed. The second electrode 230 covers the entire surface of the display region and may be formed of a conductive material having a relatively low work function to serve as a cathode. For example, the second electrode 230 may be formed of aluminum (Al), magnesium (Mg), calcium (Ca), silver (Ag), or an alloy thereof such as a Mg-Ag alloy (Mg:Ag).

[0100] In the top-emission type OLED D, the first electrode 210 serves as a reflective electrode, and the second electrode 230 has a thin profile to have a light-transmitting (or semi-light-transmitting) characteristic. That is, the visible light transmittance of the second electrode 230 may be greater than the visible light transmittance of the first electrode 210.

[0101] Alternatively, in the bottom-emission type OLED, the first electrode 210 serves as a transparent electrode, and the second electrode 230 serves as a reflective electrode. That is, the visible light transmittance of the second electrode 230 may be less than the visible light transmittance of the first electrode 210.

[0102] In the bottom-emitting type OLED D, the second electrode 230 may be formed of Al. In the top-emitting type OLED D, the second electrode 230 may be formed of Mg:Ag. In this case, the weight % ratio of Mg to Ag may be in the range of 1:9 to 9:1, preferably 1:9 to 3:7.

[0103] The top-emitting type OLED D may further include a cover layer on the second electrode 230. The luminous efficiency of the OLED D and the organic light-emitting display device 100 may be further improved by the cover layer.

[0104] An encapsulation layer (or encapsulation film) 170 is formed on the second electrode 230 to prevent moisture from penetrating into the OLED D. The encapsulation layer 170 includes a first inorganic insulating layer 172, an organic insulating layer 174, and a second inorganic insulating layer 176 stacked in sequence, but is not limited thereto.

[0105] In some embodiments, the organic light-emitting display device 100 may include a color filter layer corresponding to a red pixel region, a green pixel region, and a blue pixel region.

[0106] In the bottom-emitting type organic light-emitting display device 100, the color filter layer may be positioned between the substrate 110 and the OLED D. In the top-emitting type organic light-emitting display device 100, the color filter layer may be positioned above the OLED D. For example, in the top-emitting type organic light-emitting display device 100, the color filter layer may be positioned on the encapsulation layer 170.

[0107] In the bottom-emitting type organic light-emitting display device 100, the organic light-emitting display device 100 may further include a metal plate on or above the encapsulation layer 170.

[0108] The organic light-emitting display device 100 may further include a polarizing plate for reducing ambient light reflection. For example, the polarizing plate may be a circular polarizing plate. In the bottom-emitting type organic light-emitting display device 100, the polarizing plate may be disposed below the substrate 110. In the top-emitting type organic light-emitting display device 100, the polarizing plate may be disposed on or above the encapsulation layer 170.

[0109] In addition, the organic light-emitting display device 100 may further include a cover window on or above the encapsulation layer 170 or the polarizing plate. In this case, the substrate 110 and the cover window have flexible characteristics, so that a flexible organic light-emitting display device can be provided.

[0110] Figure 3 is a schematic cross-sectional view of an OLED according to one or more embodiments of the present disclosure.

[0111] As Figure 3As shown, the OLED D1 includes a first electrode 210 and a second electrode 230 facing each other, and an organic light-emitting layer 220 therebetween. The organic light-emitting layer 220 includes a blue light-emitting material layer (EML) 240, and the blue EML 240 includes a first blue light-emitting layer 250 and a second blue light-emitting layer 260. The top-emission type OLED D1 may further include a cover layer on the second electrode 230 to improve light extraction efficiency.

[0112] ( Figure 2 The organic light-emitting display device 100 may include a red pixel region, a green pixel region, and a blue pixel region, and the OLED D1 may be positioned in the blue pixel region.

[0113] One of the first electrode 210 and the second electrode 230 is an anode, and the other of the first electrode 210 and the second electrode 230 is a cathode. One of the first electrode 210 and the second electrode 230 may be a reflective electrode, and the other of the first electrode 210 and the second electrode 230 may be a transparent (or semi-transparent) electrode.

[0114] In the top-emission type OLED D1, the first electrode 210 may be a reflective electrode and may have a structure of ITO / Ag / ITO, and the second electrode 230 may be a transparent electrode and may be formed of Mg:Ag with a weight ratio of 1:9.

[0115] In the bottom-emission type OLED D1, the first electrode 210 may be a transparent electrode and may be formed of ITO, and the second electrode 230 may be a reflective electrode and may be formed of Al.

[0116] In the blue EML 240, the second blue light-emitting layer 260 contacts the first blue light-emitting layer 250 and is disposed on the first blue light-emitting layer 250, such that the blue EML 240 has a bilayer structure. The first blue light-emitting layer 250 is disposed closer to the first electrode 210, which is the anode, than the second blue light-emitting layer 260, and the second blue light-emitting layer 260 is disposed closer to the second electrode 230, which is the cathode, than the first blue light-emitting layer 250.

[0117] The first blue light-emitting layer 250 includes a first p-type host 252, a first n-type host 254, and a first phosphorescent dopant 256, and the second blue light-emitting layer 260 includes a second p-type host 262, a second n-type host 264, and a second phosphorescent dopant 266. For example, the first phosphorescent dopant 256 may be referred to as the first emitter, and the second phosphorescent dopant 266 may be referred to as the second emitter.

[0118] The first p-type host 252 and the second p-type host 262 are each independently represented by Formula 1.

[0119] [Formula 1]

[0120]

[0121] In Formula 1, a1 and a2 are each independently an integer from 0 to 4, and n1 is 0 or 1.

[0122] When a1 is 2 or greater, two or more R1s may be the same or different, and when a2 is 2 or greater, two or more R2s may be the same or different.

[0123] R1 and R2 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl.

[0124] M1 and M2 are each independently selected from Formula 1-1 and Formula 1-2:

[0125] [Formula 1-1]

[0126]

[0127] [Formula 1-2]

[0128]

[0129] In Formula 1-1, a3 and a4 are each independently an integer from 0 to 4.

[0130] When a3 is 2 or greater, two or more R3s may be the same or different, and when a4 is 2 or greater, two or more R4s may be the same or different.

[0131] R3 and R4 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl.

[0132] In Formula 1-2, a5, a7, a9, and a10 are each independently an integer from 0 to 4, a6 is an integer from 0 to 3, n2 is 0 or 1, when n2 is 0, a8 is an integer from 0 to 4, and when n2 is 1, a8 is an integer from 0 to 3.

[0133] When a5 is 2 or greater, two or more R5s may be the same or different; when a6 is 2 or greater, two or more R6s may be the same or different; when a7 is 2 or greater, two or more R7s may be the same or different; when a8 is 2 or greater, two or more R8s may be the same or different; when a9 is 2 or greater, two or more R9s may be the same or different; when a10 is 2 or greater, two or more Rs 10 may be the same or different, and

[0134] R5, R6, R7, R8, R9, and R 10 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl.

[0135] In each of Formula 1-1 and Formula 1-2, the "*" mark indicates the bonding site.

[0136] In the present disclosure, unless otherwise specifically defined, the substituents of alkyl, alkoxy, cycloalkyl, alkylamino, alkylsilyl, alkylgermyl, alkenyl, alkynyl, arylamino, arylsilyl, aryloxy, arylgermyl, aryl, and heteroaryl may be selected from: deuterium; halogen; cyano; alkyl which is unsubstituted or substituted with at least one of deuterium and halogen; alkoxy which is unsubstituted or substituted with at least one of deuterium and halogen; alkylsilyl which is unsubstituted or substituted with at least one of deuterium and halogen; alkoxysilyl which is unsubstituted or substituted with at least one of deuterium and halogen; cycloalkyl which is unsubstituted or substituted with at least one of deuterium, halogen, and C1-C20 alkyl; arylsilyl which is unsubstituted or substituted with at least one of deuterium, halogen, and C1-C20 alkyl; aryl which is unsubstituted or substituted with at least one of deuterium, halogen, and C1-C20 alkyl; and heteroaryl which is unsubstituted or substituted with at least one of deuterium, halogen, and C1-C20 alkyl.

[0137] In the present disclosure, unless otherwise specifically defined, C1-C20 alkyl may include C1-C10 alkyl, and may include linear alkyl and branched alkyl. For example, C1-C20 alkyl or C1-C10 alkyl may be selected from methyl, ethyl, propyl, and butyl, such as n-butyl or tert-butyl.

[0138] In the present disclosure, unless otherwise specifically defined, C3-C30 cycloalkyl may include C3-C20 cycloalkyl, and may be selected from cyclopropyl, cyclobutyl, cyclohexyl, and adamantyl.

[0139] In the present disclosure, unless otherwise specifically defined, C6-C30 arylsilyl may be triphenylsilyl. In the present disclosure, unless otherwise specifically defined, C6-C60 arylamino may include C6-C30 arylamino, such as diphenylamino.

[0140] In the present disclosure, unless otherwise specifically defined, the ring formed by two adjacent substituents (or groups) may be one of a substituted or unsubstituted C3-C30 alicyclic ring, a substituted or unsubstituted C6-C30 aromatic ring, and a substituted or unsubstituted C3-C30 heteroaromatic ring.

[0141] In the present disclosure, unless otherwise specifically defined, C6-C30 aryl may include C6-C20 aryl, and may be selected from phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, cyclopentadienyl, indenyl, indenoindene, heptalene, biphenylenyl, indacenyl, phenanthryl, benzophenanthryl, dibenzophenanthryl, azulyl, pyrenyl, fluoranthenyl, triphenylenyl, Groups, tetraphenyl, tetracenyl, picenyl, pentaphenyl, pentacenyl, fluorenyl, indeno[1,2-b]fluorene, and spirofluorene.

[0142] In the present disclosure, unless otherwise specifically defined, C3 to C60 heteroaryl may include C3 to C30 heteroaryl or C3 to C20 heteroaryl, and may be selected from pyrrolyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, tetrazinyl, imidazolyl, pyrazolyl, indolyl, isoindolyl, indazolyl, indolizinyl, pyrrolizinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, indolocarbazolyl, indeno[1,2-b]carbazolyl, benzofuro[3,2-b]carbazolyl, benzothieno[3,2-b]carbazolyl, quinolinyl, isoquinolinyl, phthalazinyl, quinoxalinyl, cinnolinyl, quinazolinyl, quinazolinyl, purinyl, phthalazinyl, quinoxalinyl, benzoquinolinyl, benzoisoquinolinyl, benzopyrazinyl, benzopyridazinyl, acridinyl, phenanthrolinyl, pyridyl, phenanthridinyl, pteridinyl, naphthyridinyl, furyl, azinyl, azolyl, diazolyl, triazolyl, di dioxynyl, benzofuryl, dibenzofuryl, thianthrenyl, xanthenyl, chromanyl, isochromanyl, thiazinyl, thienyl, benzothienyl, dibenzothienyl, difuro[3,2-b]pyrazinyl, benzofuro[3,2-b]dibenzofuryl, benzothieno[3,2-b]benzothienyl, benzothieno[3,2-b]dibenzothienyl, benzothieno[3,2-b]benzofuryl, and benzothieno[3,2-b]dibenzofuryl.

[0143] In one aspect of the present disclosure, R1 to R 10 may each independently be deuterium or a structure of Formula 1-3:

[0144] [Formula 1-3]

[0145]

[0146] In Formula 1-3,

[0147] a11, a12, and a13 are each independently an integer from 0 to 5,

[0148] when a11 is 2 or greater, two or more Rs 11 may be the same or different, when a12 is 2 or greater, two or more Rs 12 may be the same or different, when a13 is 2 or greater, two or more Rs 13 may be the same or different,

[0149] R 11 、R 12 and R 13Each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, and

[0150] X1 is one of C, Si, and Ge.

[0151] In Formula 1-3, the "*" mark represents the bonding site.

[0152] In one aspect of the present disclosure, X1 can be Si.

[0153] In one aspect of the present disclosure, a1 and a2 can each be 0.

[0154] In one aspect of the present disclosure, a1 can be 1, and R1 can be selected from C1-C20 alkyl substituted with substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C6-C30 arylsilyl, and substituted or unsubstituted C6-C30 arylgermyl. For example, R1 can be selected from triphenylmethyl, triphenylsilyl, and triphenylgermyl ((C6H5)3Ge).

[0155] In one aspect of the present disclosure, a1 can be 4, and R1 can be deuterium.

[0156] In one aspect of the present disclosure, a2 can be 4, and R2 can be deuterium.

[0157] In one aspect of the present disclosure, a3 and a4 can each be 0.

[0158] In one aspect of the present disclosure, a3 can be 1, and R3 can be selected from C1-C20 alkyl substituted with substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C6-C30 arylsilyl, and substituted or unsubstituted C6-C30 arylgermyl. For example, R3 can be selected from triphenylmethyl, triphenylsilyl, and triphenylgermyl ((C6H5)3Ge).

[0159] In one aspect of the present disclosure, a3 and a4 can each be 4, and R3 and R4 can each be deuterium.

[0160] In one aspect of the present disclosure, a5 and a6 can each be 0.

[0161] In one aspect of the present disclosure, a5 can be 1, and R5 can be selected from C1-C20 alkyl substituted with a substituted or unsubstituted C6-C30 aryl, a substituted or unsubstituted C6-C30 arylsilyl, and a substituted or unsubstituted C6-C30 arylgermyl. For example, R5 can be selected from triphenylmethyl, triphenylsilyl, and triphenylgermyl ((C6H5)3Ge).

[0162] In one aspect of the present disclosure, a5 can be 4, a6 can be 3, and R5 and R6 can each be deuterium.

[0163] In one aspect of the present disclosure, a7 and a8 can each be 0.

[0164] In one aspect of the present disclosure, a7 can be 1, and R7 can be selected from C1-C20 alkyl substituted with a substituted or unsubstituted C6-C30 aryl, a substituted or unsubstituted C6-C30 arylsilyl, and a substituted or unsubstituted C6-C30 arylgermyl. For example, R7 can be selected from triphenylmethyl, triphenylsilyl, and triphenylgermyl ((C6H5)3Ge).

[0165] In one aspect of the present disclosure, a7 can be 4, a8 can be 3, and R7 and R8 can each be deuterium.

[0166] In one aspect of the present disclosure, a9 and a10 can each be 0.

[0167] In one aspect of the present disclosure, a9 can be 1, and R9 can be selected from C1-C20 alkyl substituted with a substituted or unsubstituted C6-C30 aryl, a substituted or unsubstituted C6-C30 arylsilyl, and a substituted or unsubstituted C6-C30 arylgermyl. For example, R9 can be selected from triphenylmethyl, triphenylsilyl, and triphenylgermyl ((C6H5)3Ge).

[0168] In one aspect of the present disclosure, a9 can be 4, and R9 can be deuterium.

[0169] In one aspect of the present disclosure, a10 can be 4, and R 10 can be deuterium.

[0170] In Formula 1-2, the bonding position of the carbazole moiety can be specifically specified. For example, Formula 1-2 can be represented by one of Formula 1-2a, Formula 1-2b, Formula 1-2c, and Formula 1-2d.

[0171] [Formula 1-2a]

[0172]

[0173] [Formula 1-2b]

[0174]

[0175] [Formula 1-2c]

[0176]

[0177] [Formula 1-2d]

[0178]

[0179] In each of Formulae 1-2a to 1-2d, a5 to a10, R5 to R 10 and n2 are defined in the same manner as those in Formula 1-2.

[0180] For example, each of the first p-type host 252 and the second p-type host 262 can independently be one of the compounds of Formula 2. The first p-type host 252 and the second p-type host 262 may be the same or different.

[0181] [Formula 2]

[0182]

[0183]

[0184] One of the first n-type host 254 and the second n-type host 264 is represented by Formula 3.

[0185] [Formula 3]

[0186]

[0187] In Formula 3, b1 is an integer from 0 to 4, and b2, b3 and b4 are each independently an integer from 0 to 5,

[0188] when b1 is 2 or greater, two or more Rs 21 may be the same or different, when b2 is 2 or greater, two or more Rs 22 may be the same or different, when b3 is 2 or greater, two or more Rs 23 may be the same or different, when b4 is 2 or greater, two or more Rs 24 may be the same or different,

[0189] X2, X3 and X4 are each independently selected from N and CR 29 and at least one of X2, X3 and X4 is N,

[0190] R 21 、R 22 、R23 and R 24 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl,

[0191] R 29 is selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl,

[0192] Ar1 and Ar2 are each independently selected from substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, and

[0193] X5 is one of C, Si, and Ge.

[0194] In one aspect of the present disclosure, each of b1 to b4 can be 0.

[0195] In one aspect of the present disclosure, b1 can be 4, each of b2 to b4 can be 5, and R 21 to R 24 can each be deuterium.

[0196] In one aspect of the present disclosure, each of X2, X3, and X4 can be N.

[0197] In one aspect of the present disclosure, X5 can be Si.

[0198] In one aspect of the present disclosure, Ar1 and Ar2 can each independently be selected from substituted or unsubstituted C6-C30 aryl (e.g., phenyl) and substituted or unsubstituted C3-C30 heteroaryl (e.g., carbazolyl).

[0199] For example, Formula 3 can be represented by Formula 3a.

[0200] [Formula 3a]

[0201]

[0202] In Formula 3a, b1 to b4, R 21 to R 24 , and X2 to X5 are defined the same as those in Formula 3,

[0203] b5, b6, b7, and b8 are each independently an integer from 0 to 4,

[0204] When b5 is 2 or greater, two or more R 25 may be the same or different, when b6 is 2 or greater, two or more R 26 may be the same or different, when b7 is 2 or greater, two or more R 27 may be the same or different, when b8 is 2 or greater, two or more R 28 may be the same or different, and

[0205] R 25 , R 26 , R 27 and R 28 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, or optionally, R 25 , R 26 , R 27 and R 28 adjacent to each other combine to form a ring.

[0206] In one aspect of the present disclosure, b5 to b8 may each be 0.

[0207] In one aspect of the present disclosure, b5 to b8 may each be 4, and R 25 to R 28 may each be deuterium.

[0208] In one aspect of the present disclosure, b5 may be 1, and R 25 may be substituted or unsubstituted C3-C30 heteroaryl, such as carbazolyl.

[0209] For example, the compound represented by Formula 3 can be one of the compounds of Formula 4.

[0210] [Formula 4]

[0211]

[0212] The other of the first n-type host 254 and the second n-type host 264 is represented by Formula 5.

[0213] [Formula 5]

[0214]

[0215] In Formula 5,

[0216] R 31 to R 41 One of them is represented by Formula 5-1, and at least one of R 31 to R 41 is represented by Formula 5-2,

[0217] R 31 to R 41 The remaining ones are each independently selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, or optionally, 31 to R 41 Two adjacent ones of the remaining ones combine to form a ring,

[0218] [Formula 5-1]

[0219]

[0220] [Formula 5-2]

[0221]

[0222] In Formula 5-1, d0 is an integer from 0 to 4, and d1, d2, and d3 are each independently an integer from 0 to 5.

[0223] When d0 is 2 or greater, two or more R 50 can be the same or different, and when d1 is 2 or greater, two or more R 51can be the same or different. When d2 is 2 or greater, two or more R 52 can be the same or different. When d3 is 2 or greater, two or more R 53 Can be the same or different,

[0224] R 50 , R 51 , R 52 and R 53 are each independently selected from deuterium, substituted or unsubstituted C1 to C20 alkyl, substituted or unsubstituted C1 to C20 alkoxy, substituted or unsubstituted C3 to C30 cycloalkyl, substituted or unsubstituted C1 to C20 alkylamino, substituted or unsubstituted C6 to C30 aryloxy, substituted or unsubstituted C2 to C20 alkenyl, substituted or unsubstituted C2 to C20 alkynyl, substituted or unsubstituted C6 to C30 arylamino, substituted or unsubstituted C6 to C30 aryl, and substituted or unsubstituted C3 to C30 heteroaryl, and

[0225] X6 is one of C, Si and Ge,

[0226] In Formula 5-2, n3 is 0 or 1, d4 and d6 are each independently an integer from 0 to 4, d5 is an integer from 0 to 2,

[0227] When d4 is 2 or more, two or more R 54 Can be the same or different. When d5 is 2, the two R 55 can be the same or different. When d6 is 2 or greater, two or more R 56 Can be the same or different,

[0228] R 54 , R 55 and R 56 each independently selected from deuterium, substituted or unsubstituted C1 to C20 alkyl, substituted or unsubstituted C1 to C20 alkoxy, substituted or unsubstituted C3 to C30 cycloalkyl, substituted or unsubstituted C1 to C20 alkylamino, substituted or unsubstituted C6 to C30 aryloxy, substituted or unsubstituted C2 to C20 alkenyl, substituted or unsubstituted C2 to C20 alkynyl, substituted or unsubstituted C6 to C30 arylamino, substituted or unsubstituted C6 to C30 aryl, and substituted or unsubstituted C3 to C30 heteroaryl,

[0229] One of X7 and X8 is a single bond, and the other of X7 and X8 is selected from NR 57 , CR 58 R 59 , O and S, and

[0230] R 57 , R 58 and R 59 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl.

[0231] In each of Formula 5-1 and Formula 5-2, the "*" mark represents a bonding site.

[0232] In one aspect of the present disclosure, one or both of R 31 to R 41 can be represented by Formula 5-2.

[0233] In one aspect of the present disclosure, two adjacent ones of R 31 to R 41 can respectively have the structure of Formula 5-1 and the structure of Formula 5-2.

[0234] In one aspect of the present disclosure, one of R 31 to R 34 can have the structure of Formula 5-1, and one of R 31 to R 34 can have the structure of Formula 5-2.

[0235] In one aspect of the present disclosure, R 32 can have the structure of Formula 5-2, and R 31 or R 33 can have the structure of Formula 5-1. That is, the carbazole moiety or fused carbazole moiety of Formula 5-2 can be bonded to the para position relative to the boron atom, and the structure of Formula 5-1 can be bonded to the ortho position relative to the moiety of Formula 5-2. The lifetimes of the OLED D1 and the organic light-emitting display device 100 each containing a compound having the above structure can be significantly increased.

[0236] In one aspect of the present disclosure, one of R 31 to R 34 can have the structure of Formula 5-1, and two of R 31 to R 34 can have the structure of Formula 5-2.

[0237] In one aspect of the present disclosure, R39 to R 41 one of which may have the structure of Formula 5-1, and R 31 to R 34 the other of which may have the structure of Formula 5-2.

[0238] In one aspect of the present disclosure, R 31 to R 34 one of which may have the structure of Formula 5-1, and R 31 to R 34 the other of which, and R 39 to R 41 one of which may have the structure of Formula 5-2.

[0239] In one aspect of the present disclosure, R 31 to R 34 one of which may have the structure of Formula 5-1, and R 31 to R 34 the other of which, and R 35 to R 38 one of which may have the structure of Formula 5-2.

[0240] In one aspect of the present disclosure, R 31 to R 34 one of which may have one of the structures of Formula 5-1 and Formula 5-2, and R 35 to R 38 one of which may have the other of the structures of Formula 5-1 and Formula 5-2.

[0241] In one aspect of the present disclosure, R 31 to R 34 one of which may have one of the structures of Formula 5-1 and Formula 5-2, and R 39 to R 41 one of which may have the other of the structures of Formula 5-1 and Formula 5-2.

[0242] In one aspect of the present disclosure, one of X7 and X8 may be a single bond, and the other of X7 and X8 may be NR 57 .

[0243] In one aspect of the present disclosure, d1 to d3 may each be 0.

[0244] In one aspect of the present disclosure, d4 to d6 may each be 0.

[0245] In one aspect of the present disclosure, d4 may be 1, and R 54 may be a substituted or unsubstituted C3 to C30 heteroaryl, such as carbazolyl.

[0246] For example, the compound represented by Formula 5 can be one of the compounds of Formula 6.

[0247] [Formula 6]

[0248]

[0249]

[0250] The first phosphorescent dopant 256 and the second phosphorescent dopant 266 are each independently represented by Formula 7.

[0251] [Formula 7]

[0252]

[0253] In Formula 7, e1, e2, and e3 are each independently an integer from 0 to 4, e4 is an integer from 0 to 3, e5 is an integer from 0 to 2,

[0254] When e1 is 2 or greater, two or more Rs 61 can be the same or different. When e2 is 2 or greater, two or more Rs 62 can be the same or different. When e3 is 2 or greater, two or more Rs 63 can be the same or different. When e4 is 2 or greater, two or more Rs 64 can be the same or different. When e5 is 2, the two Rs 65 can be the same or different,

[0255] R 61 to R 65 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, and

[0256] R 66Selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl.

[0257] In one aspect of the present disclosure, R 61 to R 66 may each independently be selected from substituted or unsubstituted C1-C20 alkyl, such as methyl or tert-butyl; substituted or unsubstituted C3-C20 cycloalkyl, such as adamantyl; substituted or unsubstituted C6-C30 aryl, such as phenyl or terphenyl; and substituted or unsubstituted C3-C30 heteroaryl, such as carbazolyl.

[0258] In one aspect of the present disclosure, at least one of e1 to e5 may be a positive integer.

[0259] The maximum emission wavelength of the compound represented by Formula 7 may be in the range of 450 nm to 470 nm. The ratio of the intensity of the second emission peak to the intensity of the first emission peak may be 0.7 or less. For example, the maximum emission wavelength of the compound represented by Formula 7 may be 460 nm, and the ratio of the intensity of the second emission peak to the intensity of the first emission peak may be 0.56. In this case, the intensity of the first emission peak may be the emission intensity at the maximum emission wavelength, and the intensity of the second emission peak may be the emission intensity at the peak having the second highest emission wavelength.

[0260] For example, each of the first phosphorescent dopant 256 and the second phosphorescent dopant 266 may independently be one of the compounds of Formula 8. The first phosphorescent dopant 256 and the second phosphorescent dopant 266 may be the same or different.

[0261] [Formula 8]

[0262]

[0263] In one aspect of the present disclosure, the first n-type host 254 in the first blue light-emitting layer 250 may be a compound represented by Formula 3, and the second n-type host 264 in the second blue light-emitting layer 260 may be a compound represented by Formula 5.

[0264] In the first blue light-emitting layer 250, the maximum emission wavelength (λmax_ (PH1:NH1)) can be 480 nm or less, and the maximum emission wavelength (λmax_ of the first n-type host 254 NH1 ) can be shorter than (e.g., less than) the maximum emission wavelength (λmax_ of the mixture of the first p-type host 252 and the first n-type host 254 (PH1:NH1) ) and longer than (e.g., greater than) the maximum emission wavelength (λmax_ of the first p-type host 252 PH1 )(480 nm > λmax_ (PH1:NH1) > λmax_ NH1 > λmax_ PH1 ).

[0265] In addition, in the first blue light-emitting layer 250, the difference between the lowest unoccupied molecular orbital (LUMO) energy level (LUMO_ of the first p-type host 252 PH1 ) and the LUMO energy level (LUMO_ of the first n-type host 254 NH1 ) can be greater than 0.3 eV, and the difference between the highest occupied molecular orbital (HOMO) energy level (HOMO_ of the first p-type host 252 PH1 ) and the HOMO energy level (HOMO_ of the first n-type host 254 NH1 ) can be greater than 0.3 eV (LUMO PH1 –LUMO NH1 > 0.3 eV, HOMO PH1 –HOMO NH1 > 0.3 eV).

[0266] In the second blue light-emitting layer 260, the difference (ΔE_ between the singlet energy level and the triplet energy level of the second n-type host 264 ST ) can be less than 0.3 eV. In addition, the LUMO energy level (LUMO_ of the second n-type host 264 NH2 ) can be less than the LUMO energy level (LUMO_ of the second p-type host 262 PH2 ) and can be equal to or greater than the LUMO energy level (LUMO_ of the second phosphorescent dopant 266 PD2 )(LUMO PH2 >LUMO NH2 ≥LUMO PD2 ). For example, the LUMO energy level (LUMO_ of the second phosphorescent dopant 266 PD2 ) can be -2.6 eV.

[0267] In addition, in the second blue light-emitting layer 260, the maximum emission wavelength (λmax_ of the mixture of the second p-type host 262 and the second n-type host 264 (PH2:NH2) ) can be less than the maximum emission wavelength (λmax_ of the second n-type host 264 NH2) and is greater than the maximum emission wavelength (λmax PH2 )(λmax NH2 > λmax (PH2:NH2) > λmax PH2 ) of the second p-type host 262. In addition, the triplet energy levels of the second p-type host 262, the second n-type host 264, and the second phosphorescent dopant 266 can each be greater than 2.7 eV.

[0268] In this case, exciplex characteristics can be provided by the first p-type host 252 and the first n-type host 254 in the first blue light-emitting layer 250, and delayed fluorescence characteristics can be provided by the second p-type host 262 and the second n-type host 264 in the second blue light-emitting layer 260.

[0269] Measure the PL spectra of the compound PH-1 of Formula 2 and the compound NH1-1 of Formula 4, the PL spectrum of the mixture of the compound PH-1 of Formula 2 and the compound NH1-1 of Formula 4, and show them in Figure 4A Measure the PL spectra of the compound PH-2 of Formula 2 and the compound NH1-1 of Formula 4, the PL spectrum of the mixture of the compound PH-2 of Formula 2 and the compound NH1-1 of Formula 4, and show them in Figure 4B respectively.

[0270] As Figure 4A shown, the maximum emission wavelength in the PL spectrum of the mixture of the compound PH-1 of Formula 2 and the compound NH1-1 of Formula 4 is longer than each of the maximum emission wavelengths in the PL spectrum of the compound PH-1 of Formula 2 and the PL spectrum of the compound NH1-1 of Formula 4.

[0271] As Figure 4B shown, the maximum emission wavelength in the PL spectrum of the mixture of the compound PH-2 of Formula 2 and the compound NH1-1 of Formula 4 is longer than each of the maximum emission wavelengths in the PL spectrum of the compound PH-2 of Formula 2 and the PL spectrum of the compound NH1-1 of Formula 4.

[0272] That is, exciplex characteristics are provided by the combination of the p-type host represented by Formula 1 and selected from the compounds of Formula 2 and the n-type host represented by Formula 3 and selected from the compounds of Formula 4.

[0273] Measure the PL spectra of the compound PH-1 of Formula 2 and the compound NH2-1 of Formula 6, the PL spectrum of the mixture of the compound PH-1 of Formula 2 and the compound NH2-1 of Formula 6, and show them in Figure 4C respectively.

[0274] As Figure 4CAs shown, the maximum emission wavelength in the PL spectrum of the mixture of the compound PH-1 in Formula 2 and the compound NH2-1 in Formula 6 is longer than the maximum emission wavelength in the PL spectrum of the compound PH-1 in Formula 2 and shorter than the maximum emission wavelength in the PL spectrum of the compound NH2-1 in Formula 6. That is, the combination of a p-type host represented by Formula 1 and selected from the compounds in Formula 2 and an n-type host represented by Formula 5 and selected from the compounds in Formula 6 cannot provide exciplex characteristics, while the combination of a p-type host represented by Formula 1 and selected from the compounds in Formula 2 and an n-type host represented by Formula 5 and selected from the compounds in Formula 6 (e.g., the compound NH2-1) provides delayed fluorescence characteristics.

[0275] In one aspect of the present disclosure, the first n-type host 254 in the first blue light-emitting layer 250 disposed closer to the first electrode 210 that is the anode may be a compound represented by Formula 5, and the second n-type host 264 in the second blue light-emitting layer 260 disposed closer to the second electrode 230 that is the cathode may be a compound represented by Formula 3.

[0276] In the first blue light-emitting layer 250, the difference (ΔE ST ) between the singlet energy level and the triplet energy level of the first n-type host 254 may be less than 0.3 eV. In addition, the LUMO energy level (LUMO NH1 ) of the first n-type host 254 may be less than the LUMO energy level (LUMO PH1 ) of the first p-type host 252, and may be equal to or greater than the LUMO energy level (LUMO PD1 ) of the first phosphorescent dopant 256 (LUMO PH1 >LUMO NH1 ≥LUMO PD1 ). For example, the LUMO energy level (LUMO PD1 ) of the first phosphorescent dopant 256 may be -2.6 eV.

[0277] In addition, in the first blue light-emitting layer 250, the maximum emission wavelength (λmax_ (PH1:NH1) ) of the mixture of the first p-type host 252 and the first n-type host 254 may be shorter than the maximum emission wavelength (λmax_ NH1 ) of the first n-type host 254 and may be longer than the maximum emission wavelength (λmax_ PH1 ) of the first p-type host 252 (λmax NH1 >λmax (PH1:NH1) >λmax PH1 ). The triplet energy levels of the first p-type host 252, the first n-type host 254, and the first phosphorescent dopant 256 may be greater than 2.7 eV.

[0278] In the second blue light-emitting layer 260, the maximum emission wavelength (λmax_ (PH2:NH2) ) of the mixture of the second p-type host 262 and the second n-type host 264 can be 480 nm or less, and the maximum emission wavelength (λmax_ NH2 ) of the second n-type host 264 can be shorter than the maximum emission wavelength (λmax_ (PH2:NH2) ) of the mixture of the second p-type host 262 and the second n-type host 264 and longer than the maximum emission wavelength (λmax_ PH2 ) of the second p-type host 262 (480 nm > λmax_ (PH2:NH2) > λmax_ NH2 > λmax_ PH2 ).

[0279] In addition, in the second blue light-emitting layer 260, the difference between the LUMO energy level (LUMO PH2 ) of the second p-type host 262 and the LUMO energy level (LUMO NH2 ) of the second n-type host 264 can be greater than 0.3 eV, and the difference between the HOMO energy level (HOMO PH2 ) of the second p-type host 262 and the HOMO energy level (HOMO NH2 ) of the second n-type host 264 can be greater than 0.3 eV (LUMO PH2 – LUMO NH2 > 0.3 eV, HOMO PH2 – HOMO NH2 > 0.3 eV).

[0280] In this case, the delayed fluorescence characteristics can be provided by the first p-type host 252 and the first n-type host 254 in the first blue light-emitting layer 250, and the exciplex characteristics can be provided by the second p-type host 262 and the second n-type host 264 in the second blue light-emitting layer 260.

[0281] The PL spectrum can be measured at room temperature (i.e., 25 °C) using an organic solvent such as toluene. For example, after forming a film with a thickness of 30 nm using a solution in which the compound is dissolved at about 1 × 10 -5 M in an organic solvent (such as toluene), the PL spectrum can be measured using a photoluminescence (PL) detection and fluorescence spectrometer such as an FS-5 fluorescence spectrometer (Edinburgh Instruments).

[0282] Various methods for determining the HOMO energy level are known to those skilled in the art. For example, a conventional surface analyzer such as the AC3 surface analyzer manufactured by RKI instruments can be used to determine the HOMO energy level. The surface analyzer can be used to detect a monolayer film (pure film) of a compound with a thickness of 50 nm. The LUMO energy level can be calculated as follows:

[0283] LUMO energy level (eV) = HOMO energy level (eV) - bandgap energy level (eV).

[0284] The bandgap can be measured using a SCINCO S-3100 spectrophotometer. The HOMO and LUMO values of the compounds of the examples and embodiments disclosed herein can be determined in this way. That is, the HOMO and LUMO values can be experimentally determined values or empirically determined values for a thin film such as a 50 nm film.

[0285] The thickness of each of the first blue light-emitting layer 250 and the second blue light-emitting layer 260 can be 5 nm to 30 nm, for example, 10 nm to 20 nm. For example, the thickness of each of the first blue light-emitting layer 250 and the second blue light-emitting layer 260 can be 10 nm, 15 nm, or 20 nm.

[0286] The thickness of the first blue light-emitting layer 250 and the thickness of the second blue light-emitting layer 260 can be the same or different. In one aspect of the present disclosure, the thickness of the first blue light-emitting layer 250 and the thickness of the second blue light-emitting layer 260 can be the same.

[0287] In the first blue light-emitting layer 250, the weight percentage of each of the first p-type host 252 and the first n-type host 254 can be greater than the weight percentage of the first phosphorescent dopant 256, and the weight percentage of the first p-type host 252 and the weight percentage of the first n-type host 254 can be the same or different. For example, the weight percentage of the first p-type host 252 and the weight percentage of the first n-type host 254 can be the same.

[0288] In one aspect of the present disclosure, the first p-type host 252 can be 25 wt% to 50 wt%, the first n-type host 254 can be 25 wt% to 50 wt%, and the first phosphorescent dopant 256 can be 4 wt% to 25 wt%. In one aspect of the present disclosure, the first p-type host 252 can be 44 wt%, the first n-type host 254 can be 44 wt%, and the first phosphorescent dopant 256 can be 12 wt%.

[0289] In the second blue light-emitting layer 260, the weight percentages of the second p-type host 262 and the second n-type host 264 can each be greater than the weight percentage of the second phosphorescent dopant 266, and the weight percentages of the second p-type host 262 and the second n-type host 264 can be the same or different. For example, the weight percentages of the second p-type host 262 and the second n-type host 264 can be the same.

[0290] In one aspect of the present disclosure, the second p-type host 262 can be 25 wt% to 50 wt%, the second n-type host 264 can be 25 wt% to 50 wt%, and the second phosphorescent dopant 266 can be 4 wt% to 25 wt%. In one aspect of the present disclosure, the second p-type host 262 can be 44 wt%, the second n-type host 264 can be 44 wt%, and the second phosphorescent dopant 266 can be 12 wt%.

[0291] The weight percentage of the first p-type host 252 in the first blue light-emitting layer 250 and the weight percentage of the second p-type host 262 in the second blue light-emitting layer 260 can be the same or different. The weight percentage of the first n-type host 254 in the first blue light-emitting layer 250 and the weight percentage of the second n-type host 264 in the second blue light-emitting layer 260 can be the same or different. The weight percentage of the first phosphorescent dopant 256 in the first blue light-emitting layer 250 and the weight percentage of the second phosphorescent dopant 266 in the second blue light-emitting layer 260 can be the same or different.

[0292] The light-emitting layer 220 further includes at least one of a hole transport layer (HTL) 274 between the first electrode 210 and the EML 240 and an electron transport layer (ETL) 282 between the second electrode 230 and the EML 240.

[0293] In addition, the light-emitting layer 220 can further include at least one of a hole injection layer (HIL) 272 between the first electrode 210 and the HTL 274 and an electron injection layer (EIL) 284 between the second electrode 230 and the ETL 282.

[0294] In addition, the light-emitting layer 220 can further include at least one of an electron blocking layer (EBL) 276 between the HTL 274 and the EML 240 and a hole blocking layer (HBL) 286 between the EML 240 and the ETL 282.

[0295] For example, the OLED D1 may have a structure in which a first electrode 210 as an anode, a HIL 272, an HTL 274, an EBL 276, a first blue light-emitting layer 250, a second blue light-emitting layer 260, a HBL 286, an ETL 282, an EIL 284, and a second electrode 230 as a cathode are sequentially stacked. In this configuration, a first surface of the first blue light-emitting layer 250 contacts the second blue light-emitting layer 260, and a second surface of the first blue light-emitting layer 250 contacts the EBL 276. A first surface of the second blue light-emitting layer 260 contacts the first blue light-emitting layer 250, and a second surface of the second blue light-emitting layer 260 contacts the HBL 286.

[0296] For example, the HIL 272 may include a hole injection material selected from the following: 4,4’,4”-tris(3-methylphenylamino)triphenylamine (MTDATA), 4,4’,4”-tris(N,N-diphenyl-amino)triphenylamine (NATA), 4,4’,4”-tris(N-(naphthalen-1-yl)-N-phenyl-amino)triphenylamine (1T-NATA), 4,4’,4”-tris(N-(naphthalen-2-yl)-N-phenyl-amino)triphenylamine (2T-NATA), copper phthalocyanine (CuPc), tris(4-carbazol-9-yl-phenyl)amine (TCTA), N,N’-diphenyl-N,N’-bis(1-naphthyl)-1,1’-biphenyl-4,4”-diamine (NPB or NPD), 1,4,5,8,9,11-hexaazatriphenylene hexanitrile (dipyrazino[2,3-f:2’3’-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile) (HAT-CN), 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT / PSS), and N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine. Alternatively, the hole injection material of the HIL 272 may include a compound of Formula 9 as a host and a compound of Formula 10 as a dopant. In this case, the weight % of the compound of Formula 10 may be 1 to 10. For example, the thickness of the HIL 272 may be 1 nm to 30 nm.

[0297] HTL 274 may include a hole transport material selected from the following: N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD), NPB (NPD), 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP), poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)-benzidine] (poly-TPD), poly[(9,9-dioctylfluorene-2,7-diyl)-co-(4,4'-(N-(4-sec-butylphenyl)diphenylamine))] (TFB), di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC), 3,5-bis(9H-carbazol-9-yl)-N,N-diphenylaniline (DCDPA), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, and N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine. Alternatively, the hole transport material of HTL 274 may include a compound of Formula 9. The thickness of HTL 274 may be from 20 nm to 60 nm, preferably from 30 nm to 40 nm.

[0298] ETL 282 may include an electron transport material selected from the following: tris(8-hydroxyquinoline)aluminum (Alq3), 2-biphenyl-4-yl-5-(4-tert-butylphenyl)-1,3,4- Diazole (PBD), spiro-PBD, lithium quinolate (Liq), 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBi), bis(2-methyl-8-hydroxyquinolinato-N1,O8)-(1,1'-biphenyl-4-ol)aluminum (BAlq), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline (NBphen), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 1,3,5-tris(pyridin-3-yl-phenyl)benzene (TpPyPB), 2,4,6-tris(3'-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (TmPPPyTz), poly[9,9-bis(3'-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene]-alternating-2,7-(9,9-dioctylfluorene) (PFNBr), tris(phenylquinoxaline) (TPQ), and diphenyl-4-triphenylsilylphenylphosphine oxide (TSPO1). Alternatively, the electron transport material of ETL 282 may comprise the compound of Formula 11. For example, the thickness of ETL 282 may be from 10 nm to 50 nm, preferably from 20 nm to 40 nm.

[0299] EIL 284 may comprise an electron injection material selected from: alkali halide compounds such as LiF, CsF, NaF, or BaF2; and organometallic compounds such as Liq, lithium benzoate, or sodium stearate. For example, the thickness of EIL 284 may be from 0.1 nm to 10 nm, preferably from 0.5 nm to 2 nm.

[0300] The EBL 276 may include an electron blocking material selected from the following: TCTA, tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, TAPC, MTDATA, 1,3-bis(carbazol-9-yl)benzene (mCP), 3,3'-bis(N-carbazolyl)-1,1'-biphenyl (mCBP), CuPc, N,N'-bis[4-(bis(3-methylphenyl)amino)phenyl]-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (DNTPD), TDAPB, DCDPA, and 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzothiophene. Alternatively, the electron blocking material of the EBL 276 may be the same as the first p-type host 252 in the first blue light-emitting layer 250 or the second p-type host 262 in the second blue light-emitting layer 260. In one aspect of the present disclosure, the electron blocking material of the EBL 276 may be the same as the first p-type host 252 in the first blue light-emitting layer 250. For example, the thickness of the EBL 276 may be 5 nm to 40 nm, preferably 10 nm to 20 nm.

[0301] The HBL 286 may include a hole blocking material selected from the following: BCP, BAlq, Alq3, PBD, spiro-PBD, Liq, bis-4,6-(3,5-di-3-pyridylphenyl)-2-methylpyrimidine (B3PYMPM), bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO), 9-(6-9H-carbazol-9-yl)pyridin-3-yl)-9H-3,9'-bicarbazole, and TSPO1. Alternatively, the hole blocking material of the HBL 286 may be the same as the first n-type host 254 in the first blue light-emitting layer 250 or the second n-type host 264 in the second blue light-emitting layer 260. In one aspect of the present disclosure, the hole blocking material of the HBL 286 may be the same as the second n-type host 264 in the second blue light-emitting layer 260. For example, the thickness of the HBL 286 may be 1 nm to 20 nm, preferably 1 nm to 10 nm.

[0302] The cover layer may include the above hole transport material and may have a thickness of 50 nm to 100 nm, preferably 70 nm to 80 nm.

[0303] In the OLED D1 of the present disclosure, the blue EML 240 includes a first blue light-emitting layer 250 and a second blue light-emitting layer 260. The first blue light-emitting layer 250 includes a first p-type host 252 represented by Formula 1, a first n-type host 254 represented by one of Formula 3 and Formula 5, and a first phosphorescent dopant 256 represented by Formula 7. The second blue light-emitting layer 260 includes a second p-type host 262 represented by Formula 1, a second n-type host 264 represented by the other of Formula 3 and Formula 5, and a second phosphorescent dopant 266 represented by Formula 7. Therefore, the lifetimes of the OLED D1 and the organic light-emitting display device 100 are improved.

[0304] For example, when a blue EML having a single-layer structure includes a p-type host represented by Formula 1, an n-type host represented by one of Formula 3 and Formula 5, and a phosphorescent dopant represented by Formula 7, the recombination region in the blue EML moves toward the first electrode or the second electrode, such that a triplet-polaron quenching problem may occur at the interface between the blue EML and an adjacent layer (e.g., the EBL or the HBL). Therefore, the lifetimes of the OLED and the organic light-emitting display device may be reduced.

[0305] However, in the OLED D1 of the present disclosure, since the blue EML 240 has a bilayer structure including a phosphorescent light-emitting layer having delayed fluorescence characteristics and a phosphorescent light-emitting layer having exciplex characteristics, the recombination region shifts toward the center of the blue EML 240, such that the triplet-polaron quenching problem can be prevented. Therefore, the service life of the OLED D1 and the organic light-emitting display device 100 can be improved.

[0306] In addition, when the phosphorescent light-emitting layer having exciplex characteristics is disposed closer to the cathode, the lifetimes of the OLED D1 and the organic light-emitting display device 100 can be further improved.

[0307] In addition, when the phosphorescent light-emitting layer having delayed fluorescence characteristics and the phosphorescent light-emitting layer having exciplex characteristics have the same thickness, the lifetimes of the OLED D1 and the organic light-emitting display device 100 can be further improved.

[0308] Examples

[0309] The following examples are illustrative and not intended to be limiting. The above disclosure provides many different embodiments for implementing the features of the present invention, and the following examples describe certain embodiments. It will be understood that other modifications and methods known to those of ordinary skill in the art can also be applied to the following experimental procedures without departing from the scope of the present invention.

[0310] [OLED1]

[0311] The anode (ITO, 50 nm), HIL (the compound of Formula 9 and the compound of Formula 10 (5 wt% doped), 10 nm), HTL (the compound of Formula 9, 40 nm), EBL (15 nm), blue EML, HBL (5 nm), ETL (the compound of Formula 11, 30 nm), EIL (LiF, 1 nm), and cathode (Al, 100 nm) were deposited sequentially to form a bottom-emitting blue OLED.

[0312] [Formula 9]

[0313]

[0314] [Formula 10]

[0315]

[0316] [Formula 11]

[0317]

[0318] 1. [Comparative Example]

[0319] (1) Comparative Example 1 (Ref1)

[0320] The blue EML (30 nm) was formed using the compound PH-1 of Formula 2 (44 wt%), the compound NH1-1 of Formula 4 (44 wt%), and the compound PD-1 of Formula 8 (12 wt%). The compound PH-1 of Formula 2 was used to form the EBL, and the compound NH1-1 of Formula 4 was used to form the HBL.

[0321] (2) Comparative Example 2 (Ref2)

[0322] The blue EML (30 nm) was formed using the compound PH-1 of Formula 2 (44 wt%), the compound NH2-1 of Formula 6 (44 wt%), and the compound PD-1 of Formula 8 (12 wt%). The compound PH-1 of Formula 2 was used to form the EBL, and the compound NH2-1 of Formula 6 was used to form the HBL.

[0323] (3) Comparative Example 3 (Ref3)

[0324] The first blue light-emitting layer (10 nm) is formed on the EBL using the compound PH-1 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) is formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-1 in Formula 2, and the HBL is formed using the compound NH2-1 in Formula 6.

[0325] (4) Comparative Example 4 (Ref4)

[0326] The first blue light-emitting layer (15 nm) is formed on the EBL using the compound PH-1 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) is formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-1 in Formula 2, and the HBL is formed using the compound NH2-1 in Formula 6.

[0327] (5) Comparative Example 5 (Ref5)

[0328] The first blue light-emitting layer (20 nm) is formed on the EBL using the compound PH-1 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) is formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-1 in Formula 2, and the HBL is formed using the compound NH2-1 in Formula 6.

[0329] 2. Examples

[0330] (1) Example 1 (Ex1)

[0331] The first blue light-emitting layer (7.5 nm) was formed on the EBL using the compound PH-1 (44 wt%) of Formula 2, the compound NH2-1 (44 wt%) of Formula 6, and the compound PD-1 (12 wt%) of Formula 8, and the second blue light-emitting layer (22.5 nm) was formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) of Formula 2, the compound NH1-1 (44 wt%) of Formula 4, and the compound PD-1 (12 wt%) of Formula 8. The EBL was formed using the compound PH-1 of Formula 2, and the HBL was formed using the compound NH1-1 of Formula 4.

[0332] (2) Example 2 (Ex2)

[0333] The first blue light-emitting layer (10 nm) was formed on the EBL using the compound PH-1 (44 wt%) of Formula 2, the compound NH2-1 (44 wt%) of Formula 6, and the compound PD-1 (12 wt%) of Formula 8, and the second blue light-emitting layer (20 nm) was formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) of Formula 2, the compound NH1-1 (44 wt%) of Formula 4, and the compound PD-1 (12 wt%) of Formula 8. The EBL was formed using the compound PH-1 of Formula 2, and the HBL was formed using the compound NH1-1 of Formula 4.

[0334] (3) Example 3 (Ex3)

[0335] The first blue light-emitting layer (15 nm) was formed on the EBL using the compound PH-1 (44 wt%) of Formula 2, the compound NH2-1 (44 wt%) of Formula 6, and the compound PD-1 (12 wt%) of Formula 8, and the second blue light-emitting layer (15 nm) was formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) of Formula 2, the compound NH1-1 (44 wt%) of Formula 4, and the compound PD-1 (12 wt%) of Formula 8. The EBL was formed using the compound PH-1 of Formula 2, and the HBL was formed using the compound NH1-1 of Formula 4.

[0336] (4) Example 4 (Ex4)

[0337] The first blue light-emitting layer (20 nm) is formed on the EBL using the compound PH-1 (44 wt%) of Formula 2, the compound NH2-1 (44 wt%) of Formula 6, and the compound PD-1 (12 wt%) of Formula 8, and the second blue light-emitting layer (10 nm) is formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) of Formula 2, the compound NH1-1 (44 wt%) of Formula 4, and the compound PD-1 (12 wt%) of Formula 8. The EBL is formed using the compound PH-1 of Formula 2, and the HBL is formed using the compound NH1-1 of Formula 4.

[0338] (5) Example 5 (Ex5)

[0339] The first blue light-emitting layer (22.5 nm) is formed on the EBL using the compound PH-1 (44 wt%) of Formula 2, the compound NH2-1 (44 wt%) of Formula 6, and the compound PD-1 (12 wt%) of Formula 8, and the second blue light-emitting layer (7.5 nm) is formed on the first blue light-emitting layer using the compound PH-1 (44 wt%) of Formula 2, the compound NH1-1 (44 wt%) of Formula 4, and the compound PD-1 (12 wt%) of Formula 8. The EBL is formed using the compound PH-1 of Formula 2, and the HBL is formed using the compound NH1-1 of Formula 4.

[0340] A part of the structures of the OLEDs of Comparative Examples 1 to 5 and Examples 1 to 5 are listed in Table 1, and the light-emitting characteristics of the OLEDs of Comparative Examples 1 to 5 and Examples 1 to 5, namely the driving voltage (V, %), the external quantum efficiency (EQE, %), the color coordinate index (CIEy), the maximum emission wavelength (λ 最大 , nm), and the lifetime (LT95), are measured and listed in Table 2. The characteristics of the OLEDs are measured under the condition of 8.6 mA / cm 2 . The driving voltage and the lifetime are relative values with respect to Comparative Example 1.

[0341] Table 1

[0342]

[0343] Table 2

[0344] V EQE [%] CIEy <![CDATA[λ 最大 > LT95 Ref1 100％ 20.3 0.151 462 100％ Ref2 95％ 19.4 0.159 462 128％ Ref3 99％ 19.6 0.154 462 61％ Ref4 98％ 19.7 0.154 462 93％ Ref5 99％ 19.9 0.156 462 76％ Ex1 99％ 19.8 0.154 462 127％ Ex2 100％ 20.0 0.153 462 143％ Ex3 98％ 20.1 0.153 462 171％ Ex4 97％ 19.7 0.155 462 151％ Ex5 97％ 19.7 0.154 462 125％

[0345] As shown in Table 2, compared with the OLEDs of Comparative Examples 1 to 5, the OLEDs of Examples 1 to 5 provide improved lifetimes.

[0346] The blue EMLs in the OLEDs of Comparative Examples 1 and 2 have a single-layer structure. On the other hand, the blue EMLs in the OLEDs of Examples 1 to 5 have a double-layer structure including a first blue light-emitting layer adjacent to the anode and a second blue light-emitting layer adjacent to the cathode. In this case, the first blue light-emitting layer contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 5, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 3, and a second phosphorescent dopant represented by Formula 7.

[0347] Compared with Comparative Examples 1 and 2, the lifetimes of the OLEDs of Examples 1 to 5 are significantly improved.

[0348] Compared with the OLEDs of Comparative Examples 3 to 5 (where the blue EML has a double-layer structure including a first blue light-emitting layer adjacent to the anode and containing a first p-type host represented by Formula 1, a first n-type host represented by Formula 3, and a first phosphorescent dopant represented by Formula 7, and a second blue light-emitting layer adjacent to the cathode and containing a second p-type host represented by Formula 1, a second n-type host represented by Formula 5, and a second phosphorescent dopant represented by Formula 7), the lifetimes of the OLEDs of Examples 1 to 5 are significantly improved. That is, when the blue EML has a double-layer structure including a blue light-emitting layer having delayed fluorescence characteristics and a blue light-emitting layer having exciplex characteristics and the blue light-emitting layer having exciplex characteristics is arranged closer to the cathode, the lifetime of the OLED increases.

[0349] In addition, compared with the OLEDs of Examples 1, 2, 4, and 5 in which the blue light-emitting layer having delayed fluorescence characteristics and the blue light-emitting layer having exciplex characteristics have different thicknesses, the lifetime of the OLED of Example 3 in which the blue light-emitting layer having delayed fluorescence characteristics and the blue light-emitting layer having exciplex characteristics have the same thickness is further improved.

[0350] 3. [Comparative Examples]

[0351] (1) Comparative Example 6 (Ref6)

[0352] The blue EML (30 nm) was formed using the compound PH-2 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-2 in Formula 2, and the HBL was formed using the compound NH1-1 in Formula 4.

[0353] (2) Comparative Example 7 (Ref7)

[0354] Form a blue EML (30 nm) using the compound PH-2 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. Form an EBL using the compound PH-2 in Formula 2, and form an HBL using the compound NH2-1 in Formula 6.

[0355] (3) Comparative Example 8 (Ref8)

[0356] Form a first blue light-emitting layer (10 nm) on the EBL using the compound PH-2 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and form a second blue light-emitting layer (20 nm) on the first blue light-emitting layer using the compound PH-2 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. Form an EBL using the compound PH-2 in Formula 2, and form an HBL using the compound NH2-1 in Formula 6.

[0357] (4) Comparative Example 9 (Ref9)

[0358] Form a first blue light-emitting layer (15 nm) on the EBL using the compound PH-2 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and form a second blue light-emitting layer (15 nm) on the first blue light-emitting layer using the compound PH-2 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. Form an EBL using the compound PH-2 in Formula 2, and form an HBL using the compound NH2-1 in Formula 6.

[0359] (5) Comparative Example 10 (Ref10)

[0360] Form a first blue light-emitting layer (20 nm) on the EBL using the compound PH-2 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and form a second blue light-emitting layer (10 nm) on the first blue light-emitting layer using the compound PH-2 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. Form an EBL using the compound PH-2 in Formula 2, and form an HBL using the compound NH2-1 in Formula 6.

[0361] 4. Examples

[0362] (1) Example 6 (Ex6)

[0363] The first blue light-emitting layer (10 nm) was formed on the EBL using compound PH-2 (44 wt%) in Formula 2, compound NH2-1 (44 wt%) in Formula 6, and compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) was formed on the first blue light-emitting layer using compound PH-2 (44 wt%) in Formula 2, compound NH1-1 (44 wt%) in Formula 4, and compound PD-1 (12 wt%) in Formula 8. Compound PH-2 in Formula 2 was used to form the EBL, and compound NH1-1 in Formula 4 was used to form the HBL.

[0364] (2) Example 7 (Ex7)

[0365] The first blue light-emitting layer (15 nm) was formed on the EBL using compound PH-2 (44 wt%) in Formula 2, compound NH2-1 (44 wt%) in Formula 6, and compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) was formed on the first blue light-emitting layer using compound PH-2 (44 wt%) in Formula 2, compound NH1-1 (44 wt%) in Formula 4, and compound PD-1 (12 wt%) in Formula 8. Compound PH-2 in Formula 2 was used to form the EBL, and compound NH1-1 in Formula 4 was used to form the HBL.

[0366] (3) Example 8 (Ex8)

[0367] The first blue light-emitting layer (20 nm) was formed on the EBL using compound PH-2 (44 wt%) in Formula 2, compound NH2-1 (44 wt%) in Formula 6, and compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) was formed on the first blue light-emitting layer using compound PH-2 (44 wt%) in Formula 2, compound NH1-1 (44 wt%) in Formula 4, and compound PD-1 (12 wt%) in Formula 8. Compound PH-2 in Formula 2 was used to form the EBL, and compound NH1-1 in Formula 4 was used to form the HBL.

[0368] A part of the structures of the OLEDs of Comparative Examples 6 to 10 and Examples 6 to 8 is listed in Table 3, and the light-emitting characteristics of the OLEDs of Comparative Examples 6 to 10 and Examples 6 to 8, namely, driving voltage (V, %), external quantum efficiency (EQE, %), chromaticity coordinate index (CIEy), maximum emission wavelength (λ 最大 , nm), and lifetime (LT95(1) and LT95), were measured and listed in Table 4. The characteristics of the OLEDs were measured at 8.6 mA / cm 2Measured under the conditions. The driving voltage and lifetime (LT95(1)) are relative values with respect to Comparative Example 1, and the lifetime (LT95) is a relative value with respect to Comparative Example 6.

[0369] Table 3

[0370]

[0371] Table 4

[0372] V EQE [%] CIEy <![CDATA[λ 最大 > LT95(1) LT95 Ref6 104％ 17.9 0.153 462 85％ 100％ Ref7 99％ 16.2 0.161 462 93％ 109％ Ref8 100％ 17.4 0.158 462 54％ 64％ Ref9 101％ 17.5 0.156 462 65％ 76％ Ref10 103％ 17.8 0.156 462 49％ 58％ Ex6 103％ 17.8 0.158 462 98％ 115％ Ex7 103％ 17.7 0.159 462 121％ 142％ Ex8 102％ 16.8 0.159 462 105％ 124％

[0373] As shown in Table 4, compared with the OLEDs of Comparative Examples 6 to 10, the OLEDs of Examples 6 to 8 provide improved lifetime.

[0374] The blue EML in the OLEDs of Comparative Examples 6 and 7 has a single-layer structure. On the other hand, the blue EML in the OLEDs of Examples 6 to 8 has a double-layer structure including a first blue light-emitting layer adjacent to the anode and a second blue light-emitting layer adjacent to the cathode. In this case, the first blue light-emitting layer contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 5, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 3, and a second phosphorescent dopant represented by Formula 7.

[0375] Compared with Comparative Examples 6 and 7, the lifetimes of the OLEDs of Examples 6 to 8 are significantly improved.

[0376] Compared with the OLEDs of Comparative Examples 8 to 10 (where the blue EML has a double-layer structure including a first blue light-emitting layer adjacent to the anode and containing a first p-type host represented by Formula 1, a first n-type host represented by Formula 3, and a first phosphorescent dopant represented by Formula 7 and a second blue light-emitting layer adjacent to the cathode and containing a second p-type host represented by Formula 1, a second n-type host represented by Formula 5, and a second phosphorescent dopant represented by Formula 7), the lifetimes of the OLEDs of Examples 6 to 8 are significantly improved. That is, when the blue EML has a double-layer structure including a blue light-emitting layer with delayed fluorescence characteristics and a blue light-emitting layer with exciplex characteristics and the blue light-emitting layer with exciplex characteristics is arranged closer to the cathode, the lifetime of the OLED increases.

[0377] Furthermore, compared with the OLEDs of Examples 6 and 8 in which the blue light-emitting layer with delayed fluorescence characteristics and the blue light-emitting layer with exciplex characteristics have different thicknesses, the lifetime of the OLED of Example 7 in which the blue light-emitting layer with delayed fluorescence characteristics and the blue light-emitting layer with exciplex characteristics have the same thickness is further improved.

[0378] 5. [Comparative Example]

[0379] (1) Comparative Example 11 (Ref11)

[0380] The blue EML (30 nm) was formed using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH1-1 in Formula 4.

[0381] (2) Comparative Example 12 (Ref12)

[0382] The blue EML (30 nm) was formed using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH2-1 in Formula 6.

[0383] (3) Comparative Example 13 (Ref13)

[0384] The first blue light-emitting layer (10 nm) was formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) was formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%). The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH2-1 in Formula 6.

[0385] (4) Comparative Example 14 (Ref14)

[0386] The first blue light-emitting layer (15 nm) was formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) was formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%). The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH2-1 in Formula 6.

[0387] (5) Comparative Example 15 (Ref15)

[0388] The first blue light-emitting layer (20 nm) was formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) was formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH2-1 in Formula 6.

[0389] 6. Examples

[0390] (1) Example 9 (Ex9)

[0391] The first blue light-emitting layer (10 nm) was formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) was formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH1-1 in Formula 4.

[0392] (2) Example 10 (Ex10)

[0393] The first blue light-emitting layer (15 nm) was formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) was formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH1-1 in Formula 4.

[0394] (3) Example 11 (Ex11)

[0395] The first blue light-emitting layer (20 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0396] A part of the structure of the OLEDs of Comparative Examples 11 to 15 and Examples 9 to 11 is listed in Table 5, and the light-emitting characteristics of the OLEDs of Comparative Examples 11 to 15 and Examples 9 to 11, namely, the driving voltage (V, %), the external quantum efficiency (EQE, %), the color coordinate index (CIEy), the maximum emission wavelength (λ 最大 , nm), and the lifetime (LT95(1) and LT95), are measured and listed in Table 6. The characteristics of the OLEDs are measured under the condition of 8.6 mA / cm 2 . The driving voltage and the lifetime (LT95(1)) are relative values with respect to Comparative Example 1, and the lifetime (LT95) is a relative value with respect to Comparative Example 11.

[0397] Table 5

[0398]

[0399] Table 6

[0400]

[0401]

[0402] As shown in Table 6, the OLEDs of Examples 9 to 11 provide an improved lifetime compared to the OLEDs of Comparative Examples 11 to 15.

[0403] The blue EML in the OLEDs of Comparative Examples 11 and 12 has a single-layer structure. On the other hand, the blue EML in the OLEDs of Examples 9 to 11 has a double-layer structure including a first blue light-emitting layer adjacent to the anode and a second blue light-emitting layer adjacent to the cathode. In this case, the first blue light-emitting layer contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 5, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 3, and a second phosphorescent dopant represented by Formula 7.

[0404] Compared with Comparative Examples 11 and 12, the lifetime of the OLEDs of Examples 9 to 11 is significantly improved.

[0405] Compared with the OLEDs of Comparative Examples 13 to 15, in which the blue EML has a double-layer structure including a first blue light-emitting layer and a second blue light-emitting layer, the first blue light-emitting layer is adjacent to the anode and contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 3, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer is adjacent to the cathode and contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 5, and a second phosphorescent dopant represented by Formula 7, the lifetimes of the OLEDs of Examples 9 to 11 are significantly improved. That is, when the blue EML has a double-layer structure including a blue light-emitting layer with delayed fluorescence characteristics and a blue light-emitting layer with exciplex characteristics and the blue light-emitting layer with exciplex characteristics is arranged closer to the cathode, the lifetime of the OLED increases.

[0406] In addition, compared with the OLEDs of Examples 9 and 11 in which the blue light-emitting layer with delayed fluorescence characteristics and the blue light-emitting layer with exciplex characteristics have different thicknesses, the lifetime of the OLED of Example 10 in which the blue light-emitting layer with delayed fluorescence characteristics and the blue light-emitting layer with exciplex characteristics have the same thickness is further improved.

[0407] 7. [Comparative Examples]

[0408] (1) Comparative Example 16 (Ref16)

[0409] A blue EML (30 nm) was formed using the compound PH-3 in Formula 2 (44 wt%), the compound NH-A in Formula 12 (44 wt%), and the compound PD-1 in Formula 8 (12 wt%). The compound PH-3 in Formula 2 was used to form the EBL, and the compound NH-A in Formula 12 was used to form the HBL.

[0410] (2) Comparative Example 17 (Ref17)

[0411] A first blue light-emitting layer (10 nm) was formed on the EBL using the compound PH-3 in Formula 2 (44 wt%), the compound NH-A in Formula 12 (44 wt%), and the compound PD-1 in Formula 8 (12 wt%), and a second blue light-emitting layer (20 nm) was formed on the first blue light-emitting layer using the compound PH-3 in Formula 2 (44 wt%), the compound NH1-1 in Formula 4 (44 wt%), and the compound PD-1 in Formula 8 (12 wt%). The compound PH-3 in Formula 2 was used to form the EBL, and the compound NH1-1 in Formula 4 was used to form the HBL.

[0412] (3) Comparative Example 18 (Ref18)

[0413] The first blue light-emitting layer (15 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH-A (44 wt%) in Formula 12, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0414] (4) Comparative Example 19 (Ref19)

[0415] The first blue light-emitting layer (20 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH-A (44 wt%) in Formula 12, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0416] (5) Comparative Example 20 (Ref20)

[0417] The first blue light-emitting layer (10 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH-A (44 wt%) in Formula 12, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH-A in Formula 12.

[0418] (6) Comparative Example 21 (Ref21)

[0419] The first blue light-emitting layer (15 nm) was formed on the EBL using compound PH-3 (44 wt%) in Formula 2, compound NH1-1 (44 wt%) in Formula 4, and compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) was formed on the first blue light-emitting layer using compound PH-3 (44 wt%) in Formula 2, compound NH-A (44 wt%) in Formula 12, and compound PD-1 (12 wt%) in Formula 8. The EBL was formed using compound PH-3 in Formula 2, and the HBL was formed using compound NH-A in Formula 12.

[0420] (7) Comparative Example 22 (Ref22)

[0421] The first blue light-emitting layer (20 nm) was formed on the EBL using compound PH-3 (44 wt%) in Formula 2, compound NH1-1 (44 wt%) in Formula 4, and compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) was formed on the first blue light-emitting layer using compound PH-3 (44 wt%) in Formula 2, compound NH-A (44 wt%) in Formula 12, and compound PD-1 (12 wt%) in Formula 8. The EBL was formed using compound PH-3 in Formula 2, and the HBL was formed using compound NH-A in Formula 12.

[0422] [Formula 12]

[0423]

[0424] A part of the structures of the OLEDs of Comparative Examples 11 and 16 to 22 and Examples 9 to 11 is listed in Table 7, and the light-emitting characteristics of the OLEDs of Comparative Examples 11 and 16 to 22 and Examples 9 to 11 were measured, namely, the driving voltage (V, %), the external quantum efficiency (EQE, %), the chromaticity coordinate index (CIEy), the maximum emission wavelength (λ 最大 , nm), and the lifetimes (LT95(1) and LT95), and they are listed in Table 8. The characteristics of the OLEDs were measured under the condition of 8.6 mA / cm 2 . The driving voltage and the lifetime (LT95(1)) are relative values with respect to Comparative Example 1, and the lifetime (LT95) is a relative value with respect to Comparative Example 11.

[0425] Table 7

[0426]

[0427] Table 8

[0428]

[0429] As shown in Table 8, the lifetimes of the OLEDs of Comparative Examples 16 to 22 were significantly reduced compared to those of Comparative Example 11 and Examples 9 to 11.

[0430] That is, the compound NH-A in Formula 12 has a structure similar to that of the compound NH2-1 in Formula 6, but does not contain a triphenylsilyl moiety. The lifetimes of the OLEDs of Comparative Examples 16 to 22 were significantly reduced due to the above structural differences.

[0431] Although the OLEDs of Examples 9 to 11 and the OLEDs of Comparative Examples 17 to 19 have the same blue light-emitting layer structure, due to the structural differences of the n-type host, an increase in the lifetime of the OLEDs of Comparative Examples 17 to 19 cannot be provided.

[0432] 8. [Comparative Example]

[0433] (1) Comparative Example 23 (Ref23)

[0434] A blue EML (30 nm) was formed using the compound PH-4 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The compound PH-4 in Formula 2 was used to form the EBL, and the compound NH1-1 in Formula 4 was used to form the HBL.

[0435] (2) Comparative Example 24 (Ref24)

[0436] A blue EML (30 nm) was formed using the compound PH-4 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The compound PH-4 in Formula 2 was used to form the EBL, and the compound NH2-1 in Formula 6 was used to form the HBL.

[0437] 9. Example

[0438] (1) Example 12 (Ex12)

[0439] A first blue light-emitting layer (10 nm) was formed on the EBL using the compound PH-4 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%), and a second blue light-emitting layer (20 nm) was formed on the first blue light-emitting layer using the compound PH-4 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%). The compound PH-4 in Formula 2 was used to form the EBL, and the compound NH1-1 in Formula 4 was used to form the HBL.

[0440] (2) Example 13 (Ex13)

[0441] The first blue light-emitting layer (15 nm) was formed on the EBL using the compound PH-4 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) was formed on the first blue light-emitting layer using the compound PH-4 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-4 in Formula 2, and the HBL was formed using the compound NH1-1 in Formula 4.

[0442] (3) Example 14 (Ex14)

[0443] The first blue light-emitting layer (20 nm) was formed on the EBL using the compound PH-4 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) was formed on the first blue light-emitting layer using the compound PH-4 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-4 in Formula 2, and the HBL was formed using the compound NH1-1 in Formula 4.

[0444] A part of the structures of the OLEDs of Comparative Examples 23 and 24 and Examples 12 to 14 are listed in Table 9, and the light-emitting characteristics of the OLEDs of Comparative Examples 23 and 24 and Examples 12 to 14 were measured, namely, the driving voltage (V, %), the external quantum efficiency (EQE, %), the chromaticity coordinate index (CIEy), the maximum emission wavelength (λ 最大 , nm), and the lifetime (LT95(1) and LT95), and they are listed in Table 10. The characteristics of the OLEDs were measured under the condition of 8.6 mA / cm 2 . The driving voltage and the lifetime (LT95(1)) are relative values with respect to Comparative Example 1, and the lifetime (LT95) is a relative value with respect to Comparative Example 23.

[0445] Table 9

[0446]

[0447] Table 10

[0448] V EQE [%] CIEy <![CDATA[λ 最大 > LT95(1) LT95 Ref23 106％ 21.3 0.151 462 131％ 100％ Ref24 102％ 19.1 0.158 462 135％ 103％ Ex12 104％ 20.8 0.153 462 141％ 108％ Ex13 106％ 20.6 0.154 462 159％ 121％ Ex14 105％ 19.7 0.156 462 147％ 112％

[0449] As shown in Table 10, compared with the OLEDs of Comparative Examples 23 and 24, the OLEDs of Examples 12 to 14 provided improved lifetimes.

[0450] The blue EML in the OLEDs of Comparative Examples 23 and 24 has a single-layer structure. On the other hand, the blue EML in the OLEDs of Examples 12 to 14 has a double-layer structure including a first blue light-emitting layer adjacent to the anode and a second blue light-emitting layer adjacent to the cathode. In this case, the first blue light-emitting layer contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 5, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 3, and a second phosphorescent dopant represented by Formula 7.

[0451] Compared with Comparative Examples 23 and 24, the lifetime of the OLEDs of Examples 12 to 14 is significantly improved.

[0452] Furthermore, compared with the OLEDs of Examples 12 and 14 in which the blue light-emitting layer having delayed fluorescence characteristics and the blue light-emitting layer having exciplex characteristics have different thicknesses, the lifetime of the OLED of Example 13 in which the blue light-emitting layer having delayed fluorescence characteristics and the blue light-emitting layer having exciplex characteristics have the same thickness is further improved.

[0453] 10. [Comparative Example]

[0454] (1) Comparative Example 25 (Ref25)

[0455] A blue EML (30 nm) is formed using the compound PH-5 in Formula 2 (44 wt%), the compound NH1-1 in Formula 4 (44 wt%), and the compound PD-1 in Formula 8 (12 wt%). The compound PH-5 in Formula 2 is used to form the EBL, and the compound NH1-1 in Formula 4 is used to form the HBL.

[0456] (2) Comparative Example 26 (Ref26)

[0457] A blue EML (30 nm) is formed using the compound PH-5 in Formula 2 (44 wt%), the compound NH2-1 in Formula 6 (44 wt%), and the compound PD-1 in Formula 8 (12 wt%). The compound PH-5 in Formula 2 is used to form the EBL, and the compound NH2-1 in Formula 6 is used to form the HBL.

[0458] 11. Example

[0459] (1) Example 15 (Ex15)

[0460] The first blue light-emitting layer (10 nm) is formed on the EBL using the compound PH-5 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) is formed on the first blue light-emitting layer using the compound PH-5 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-5 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0461] (2) Example 16 (Ex16)

[0462] The first blue light-emitting layer (15 nm) is formed on the EBL using the compound PH-5 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) is formed on the first blue light-emitting layer using the compound PH-5 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-5 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0463] (3) Example 17 (Ex17)

[0464] The first blue light-emitting layer (20 nm) is formed on the EBL using the compound PH-5 (44 wt%) in Formula 2, the compound NH2-1 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) is formed on the first blue light-emitting layer using the compound PH-5 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-5 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0465] A part of the structures of the OLEDs of Comparative Examples 25 and 26 and Examples 15 to 17 are listed in Table 11, and the light-emitting characteristics of the OLEDs of Comparative Examples 25 and 26 and Examples 15 to 17, namely, the driving voltage (V, %), the external quantum efficiency (EQE, %), the chromaticity coordinate index (CIEy), the maximum emission wavelength (λ 最大 , nm), and the lifetime (LT95(1) and LT95), are measured and listed in Table 12. The characteristics of the OLEDs are at 8.6 mA / cm 2Measured under the conditions. The driving voltage and the lifetime (LT95(1)) are relative values with respect to Comparative Example 1, and the lifetime (LT95) is a relative value with respect to Comparative Example 25.

[0466] Table 11

[0467]

[0468]

[0469] Table 12

[0470] V EQE [%] CIEy <![CDATA[λ 最大 > LT95(1) LT95 Ref25 95％ 21.0 0.150 462 83％ 00％ Ref26 92％ 17.8 0.157 462 92％ 11％ Ex15 96％ 20.3 0.152 462 98％ 18％ Ex16 94％ 19.5 0.154 462 119％ 43％ Ex17 94％ 18.9 0.155 462 101％ 22％

[0471] As shown in Table 12, compared with the OLEDs of Comparative Examples 25 and 26, the OLEDs of Examples 15 to 17 provide improved lifetime.

[0472] The blue EML in the OLEDs of Comparative Examples 25 and 26 has a single-layer structure. On the other hand, the blue EML in the OLEDs of Examples 15 to 17 has a double-layer structure including a first blue light-emitting layer adjacent to the anode and a second blue light-emitting layer adjacent to the cathode. In this case, the first blue light-emitting layer contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 5, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 3, and a second phosphorescent dopant represented by Formula 7.

[0473] Compared with Comparative Examples 25 and 26, the lifetime of the OLEDs of Examples 15 to 17 is significantly improved.

[0474] Furthermore, compared with the OLEDs of Examples 15 and 17 in which the blue light-emitting layer having delayed fluorescence characteristics and the blue light-emitting layer having exciplex characteristics have different thicknesses, the lifetime of the OLED of Example 16 in which the blue light-emitting layer having delayed fluorescence characteristics and the blue light-emitting layer having exciplex characteristics have the same thickness is further improved.

[0475] 12. Comparative Example 27 (Ref27)

[0476] The blue EML (30 nm) was formed using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-2 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8. The EBL was formed using the compound PH-3 in Formula 2, and the HBL was formed using the compound NH2-2 in Formula 6.

[0477] 13. Examples

[0478] (1) Example 18 (Ex18)

[0479] The first blue light-emitting layer (10 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-2 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (20 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0480] (2) Example 19 (Ex19)

[0481] The first blue light-emitting layer (15 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-2 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (15 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0482] (3) Example 20 (Ex20)

[0483] The first blue light-emitting layer (20 nm) is formed on the EBL using the compound PH-3 (44 wt%) in Formula 2, the compound NH2-2 (44 wt%) in Formula 6, and the compound PD-1 (12 wt%) in Formula 8, and the second blue light-emitting layer (10 nm) is formed on the first blue light-emitting layer using the compound PH-3 (44 wt%) in Formula 2, the compound NH1-1 (44 wt%) in Formula 4, and the compound PD-1 (12 wt%) in Formula 8. The EBL is formed using the compound PH-3 in Formula 2, and the HBL is formed using the compound NH1-1 in Formula 4.

[0484] A part of the structures of the OLEDs of Comparative Examples 11 and 27 and Examples 18 to 20 are listed in Table 13, and the light-emitting characteristics of the OLEDs of Comparative Examples 11 and 27 and Examples 18 to 20, namely, the driving voltage (V, %), the external quantum efficiency (EQE, %), the color coordinate index (CIEy), the maximum emission wavelength (λ 最大 , nm), and the lifetime (LT95(1) and LT95), are measured and listed in Table 14. The characteristics of the OLEDs are measured at 8.6 mA / cm 2Measured under the conditions. The driving voltage and lifetime (LT95(1)) are relative values with respect to Comparative Example 1, and the lifetime (LT95) is a relative value with respect to Comparative Example 11.

[0485] Table 13

[0486]

[0487] Table 14

[0488] V EQE [%] CIEy <![CDATA[λ 最大 > LT95(1) LT95 Ref11 103％ 20.7 0.151 462 106％ 100％ Ref27 96％ 18.3 0.158 462 118％ 111％ Ex18 103％ 19.5 0.153 462 132％ 125％ Ex19 102％ 19.9 0.154 462 155％ 146％ Ex20 102％ 19.6 0.156 462 131％ 124％

[0489] As shown in Table 14, the OLEDs of Examples 18 to 20 provide improved lifetimes compared to the OLEDs of Comparative Examples 11 and 27.

[0490] The blue EMLs in the OLEDs of Comparative Examples 11 and 27 have a single-layer structure. On the other hand, the blue EMLs in the OLEDs of Examples 18 to 20 have a double-layer structure including a first blue light-emitting layer adjacent to the anode and a second blue light-emitting layer adjacent to the cathode. In this case, the first blue light-emitting layer contains a first p-type host represented by Formula 1, a first n-type host represented by Formula 5, and a first phosphorescent dopant represented by Formula 7, and the second blue light-emitting layer contains a second p-type host represented by Formula 1, a second n-type host represented by Formula 3, and a second phosphorescent dopant represented by Formula 7.

[0491] Compared to Comparative Examples 11 and 27, the lifetimes of the OLEDs of Examples 18 to 20 are significantly improved.

[0492] Furthermore, compared to the OLEDs of Examples 18 and 20 in which the blue light-emitting layers with delayed fluorescence characteristics and the blue light-emitting layers with exciplex characteristics have different thicknesses, the lifetime of the OLED of Example 19 in which the blue light-emitting layers with delayed fluorescence characteristics and the blue light-emitting layers with exciplex characteristics have the same thickness is further improved.

[0493] Figure 5 is a schematic cross-sectional view of an OLED according to one or more embodiments of the present disclosure.

[0494] As Figure 5 shown, the OLED D2 includes a first electrode 210 and a second electrode 230 facing each other and an organic light-emitting layer 220 therebetween. The organic light-emitting layer 220 includes a first light-emitting portion ST1 and a second light-emitting portion ST2. The first light-emitting portion ST1 includes a first blue EML 310, and the second light-emitting portion ST2 includes a second blue EML 350. The organic light-emitting layer 220 may include a CGL 390 between the first light-emitting portion ST1 and the second light-emitting portion ST2. The top-emitting OLED D2 may further include a cover layer on the second electrode 230 to improve light extraction efficiency.

[0495] The organic light emitting display device 100 may include a red pixel region, a green pixel region, and a blue pixel region, and the OLED D2 may be positioned in the blue pixel region.

[0496] One of the first electrode 210 and the second electrode 230 may be an anode, and the other of the first electrode 210 and the second electrode 230 may be a cathode. One of the first electrode 210 and the second electrode 230 may be a reflective electrode, and the other of the first electrode 210 and the second electrode 230 may be a transparent (or semi-transparent) electrode.

[0497] In the top-emitting type OLED D2, the first electrode 210 may be a reflective electrode and may have a structure of ITO / Ag / ITO, and the second electrode 230 may be a transparent electrode and may be formed of Mg:Ag having a weight % ratio of 1:9.

[0498] In the bottom-emitting type OLED D2, the first electrode 210 may be a transparent electrode and may be formed of ITO, and the second electrode 230 may be a reflective electrode and may be formed of Al.

[0499] The first blue EML 310 in the first light emitting portion ST1 includes a first blue light emitting layer 320 and a second blue light emitting layer 330. In the first blue EML 310, the second blue light emitting layer 330 contacts the first blue light emitting layer 320 and is disposed on the first blue light emitting layer 320, such that the first blue EML 310 has a bilayer structure. The first blue light emitting layer 320 is disposed closer to the first electrode 210 which is the anode than the second blue light emitting layer 330, and the second blue light emitting layer 330 is disposed closer to the second electrode 230 which is the cathode than the first blue light emitting layer 320.

[0500] The first blue light emitting layer 320 includes a first p-type host 322, a first n-type host 324, and a first phosphorescent dopant 326, and the second blue light emitting layer 330 includes a second p-type host 332, a second n-type host 334, and a second phosphorescent dopant 336. For example, the first phosphorescent dopant 326 may be referred to as the first emitter, and the second phosphorescent dopant 336 may be referred to as the second emitter.

[0501] The first p-type host 322 and the second p-type host 332 are each represented by Formula 1 and are independently selected from the compounds of Formula 2. The first p-type host 322 and the second p-type host 332 may be the same or different.

[0502] One of the first n-type host 324 and the second n-type host 334 is represented by Formula 3 and is selected from the compounds of Formula 4. The other of the first n-type host 324 and the second n-type host 334 is represented by Formula 5 and is selected from the compounds of Formula 6.

[0503] Each of the first phosphorescent dopant 326 and the second phosphorescent dopant 336 is represented by Formula 7 and is independently selected from the compounds of Formula 8. The first phosphorescent dopant 326 and the second phosphorescent dopant 336 may be the same or different.

[0504] The thickness of each of the first blue light-emitting layer 320 and the second blue light-emitting layer 330 may be 5 nm to 30 nm, for example, 10 nm to 20 nm. For example, the thickness of each of the first blue light-emitting layer 320 and the second blue light-emitting layer 330 may be 10 nm, 15 nm, or 20 nm.

[0505] The thickness of the first blue light-emitting layer 320 and the thickness of the second blue light-emitting layer 330 may be the same or different. In one aspect of the present disclosure, the thickness of the first blue light-emitting layer 320 and the thickness of the second blue light-emitting layer 330 may be the same.

[0506] In the first blue light-emitting layer 320, the weight percentages of the first p-type host 322 and the first n-type host 324 may be greater than the weight percentage of the first phosphorescent dopant 326, and the weight percentages of the first p-type host 322 and the first n-type host 324 may be the same or different. For example, the weight percentages of the first p-type host 322 and the first n-type host 324 may be the same.

[0507] In one aspect of the present disclosure, the first p-type host 322 may be 25 wt% to 50 wt%, the first n-type host 324 may be 25 wt% to 50 wt%, and the first phosphorescent dopant 326 may be 4 wt% to 25 wt%. In one aspect of the present disclosure, the first p-type host 322 may be 44 wt%, the first n-type host 324 may be 44 wt%, and the first phosphorescent dopant 326 may be 12 wt%.

[0508] In the second blue light-emitting layer 330, the weight percentages of the second p-type host 332 and the second n-type host 334 may be greater than the weight percentage of the second phosphorescent dopant 336, and the weight percentages of the second p-type host 332 and the second n-type host 334 may be the same or different. For example, the weight percentages of the second p-type host 332 and the second n-type host 334 may be the same.

[0509] In one aspect of the present disclosure, the second p-type host 332 may be 25 wt% to 50 wt%, the second n-type host 334 may be 25 wt% to 50 wt%, and the second phosphorescent dopant 336 may be 4 wt% to 25 wt%. In one aspect of the present disclosure, the second p-type host 332 may be 44 wt%, the second n-type host 334 may be 44 wt%, and the second phosphorescent dopant 336 may be 12 wt%.

[0510] The weight percentage of the first p-type host 322 in the first blue light-emitting layer 320 and the weight percentage of the second p-type host 332 in the second blue light-emitting layer 330 may be the same or different. The weight percentage of the first n-type host 324 in the first blue light-emitting layer 320 and the weight percentage of the second n-type host 334 in the second blue light-emitting layer 330 may be the same or different. The weight percentage of the first phosphorescent dopant 326 in the first blue light-emitting layer 320 and the weight percentage of the second phosphorescent dopant 336 in the second blue light-emitting layer 330 may be the same or different.

[0511] In the present disclosure, the first n-type host 324 included in the first blue light-emitting layer 320 disposed closer to the first electrode 210 as the anode may be represented by Formula 5 and selected from the compounds of Formula 6, and the second n-type host 334 included in the second blue light-emitting layer 330 disposed closer to the second electrode 230 as the cathode may be represented by Formula 3 and selected from the compounds of Formula 4. In this case, the delayed fluorescence characteristics may be provided by the first blue light-emitting layer 320, and the exciplex characteristics may be provided by the second blue light-emitting layer 330. Accordingly, the lifetime of the OLED D2 and the organic light-emitting display device 100 including the same may be significantly increased.

[0512] The first light-emitting unit ST1 may further include at least one of a first HTL 344 below the first blue EML 310 and a first ETL 346 above the first blue EML 310.

[0513] In addition, the first light-emitting unit ST1 may further include a HIL 342 between the first electrode 210 and the first HTL 344.

[0514] In addition, the first light-emitting unit ST1 may further include at least one of a first EBL between the first HTL 344 and the first blue EML 310 and a first HBL between the first blue EML 310 and the first ETL 346.

[0515] The second blue EML 350 may have a single-layer structure. The thickness of the second blue EML 350 may be 10 nm to 60 nm.

[0516] The second blue EML 350 may include a blue host 352 and a blue dopant (e.g., an emitter) 354. The second blue EML 350 may also include a co-dopant (or co-host). In the second blue EML 350, the weight % of the blue dopant 354 may be less than the weight % of each of the blue host 352 and the co-dopant.

[0517] For example, the blue host 352 may be selected from mCP, 9-(3-(9H-carbazol-9-yl)phenyl)-9H-carbazole-3-carbonitrile (mCP-CN), mCBP, CBP-CN, 9-(3-(9H-carbazol-9-yl)phenyl)-3-(diphenylphosphoryl)-9H-carbazole (mCPPO1), 3,5-bis(9H-carbazol-9-yl)biphenyl (Ph-mCP), TSPO1, 9-(3’-(9H-carbazol-9-yl)-[1,1’-biphenyl]-3-yl)-9H-pyrido[2,3-b]indole (CzBPCb), bis(2-methylphenyl)diphenylsilane (UGH-1), 1,4-bis(triphenylsilyl)benzene (UGH-2), 1,3-bis(triphenylsilyl)benzene (UGH-3), 9,9-spirobifluorene-2-yl-diphenyl-phosphine oxide (SPPO1), and 9,9’-(5-(triphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (SimCP).

[0518] For example, the blue dopant 354 may be selected from perylene, 4,4’-bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi), 4-(di-p-tolylamino)-4,4’-[(di-p-tolylamino)styryl]stilbene (DPAVB), 4,4’-bis[4-(diphenylamino)styryl]biphenyl (BDAVBi), 2,7-bis(4-diphenylaminostyryl)-9,9-spirobifluorene (spiro-DPVBi), [1,4-bis[2-[4-[N,N-di(p-tolyl)amino]phenyl]vinyl]benzene (DSB), 1,4-di-[4-(N,N-diphenyl)amino]styryl-benzene (DSA), 2,5,8,11-tetra-tert-butylperylene (TBPe), bis(2-hydroxyphenyl)-pyridine)beryllium (Bepp2), and 9-(9-phenylcarbazol-3-yl)-10-(naphthalen-1-yl)anthracene (PCAN).

[0519] In one aspect of the present disclosure, the blue host 352 may include at least one of the compounds in Formula 13.

[0520] [Formula 13]

[0521]

[0522] In one aspect of the present disclosure, the blue dopant 354 may be a fluorescent compound selected from the compounds of Formula 14.

[0523] [Formula 14]

[0524]

[0525] In one aspect of the present disclosure, the co-dopant may be a phosphorescent compound or a delayed fluorescence compound. For example, the co-dopant may be selected from the compounds of Formula 15.

[0526] [Formula 15]

[0527]

[0528] In one aspect of the present disclosure, the second blue EML 350 may be a fluorescent emitting layer comprising the compound H-1 of Formula 13 and the compound FD-1 of Formula 14.

[0529] In one aspect of the present disclosure, the second blue EML 350 may be a phosphor-sensitized fluorescence (PSF) emitting layer comprising the compound H-2 of Formula 13, the compound H-3 of Formula 13, the compound FD-2 of Formula 14, and the compound A-1 of Formula 15.

[0530] In one aspect of the present disclosure, the second blue EML 350 may be a hyperfluorescent emitting layer comprising the compound H-2 of Formula 13, the compound H-3 of Formula 13, the compound FD-2 of Formula 14, and the compound A-2 of Formula 15.

[0531] The second light emitting portion ST2 may further include at least one of a second HTL 382 below the second blue EML 350 and a second ETL 384 above the second blue EML 350.

[0532] In addition, the second light emitting portion ST2 may further include an EIL 386 between the second electrode 230 and the second ETL 384.

[0533] In addition, the second light emitting portion ST2 may further include at least one of a second EBL between the second HTL 382 and the second blue EML 350 and a second HBL between the second blue EML 350 and the second ETL 384.

[0534] For example, the HIL 342 may contain the above hole injection material and may have a thickness of 1 nm to 30 nm, preferably 5 nm to 15 nm.

[0535] The first HTL 344 and the second HTL 382 may each contain the above hole transport material and may have a thickness of 20 nm to 60 nm, preferably 30 nm to 40 nm.

[0536] The first ETL 346 and the second ETL 384 may each contain the above electron transport material and may have a thickness of 10 nm to 50 nm, preferably 20 nm to 40 nm.

[0537] The EIL 386 may contain the above electron injection material and may have a thickness of 0.1 nm to 10 nm, preferably 0.5 nm to 2 nm.

[0538] The first EBL and the second EBL may each contain the above electron blocking material and may have a thickness of 5 nm to 40 nm, preferably 10 nm to 20 nm.

[0539] The first HBL and the second HBL may each contain the above hole blocking material and may have a thickness of 1 nm to 20 nm, preferably 1 nm to 10 nm.

[0540] The CGL 390 is positioned between the first light emitting part ST1 and the second light emitting part ST2. That is, the first light emitting part ST1 and the second light emitting part ST2 are connected to each other through the CGL 390. The CGL 390 may be a PN junction CGL of an N-type CGL 392 and a P-type CGL 394.

[0541] The N-type CGL 392 is positioned between the first ETL 346 and the second HTL 382, and the P-type CGL 394 is positioned between the N-type CGL 392 and the second HTL 382.

[0542] The N-type CGL 392 supplies electrons to the first blue EML 310 of the first light emitting part ST1, and the P-type CGL 394 supplies holes to the second blue EML 350 of the second light emitting part ST2.

[0543] The N-type CGL 392 may be an organic layer doped with an alkali metal (such as Li, Na, K, and Cs) and / or an alkaline earth metal (such as Mg, Sr, Ba, and Ra). For example, the N-type CGL 392 may be formed of an N-type charge generation material, the N-type charge generation material includes a host which is an organic material (such as 4,7-diphenyl-1,10-phenanthroline (Bphen) and MTDATA), a dopant which is an alkali metal and / or an alkaline earth metal, and the dopant may be doped at 0.01 to 30 wt%.

[0544] The P-type CGL 394 can be formed of a P-type charge generation material, and the P-type charge generation material includes inorganic materials such as tungsten oxide (WOx), molybdenum oxide (MoOx), beryllium oxide (Be2O3), or vanadium oxide (V2O5); organic materials such as NPD, HAT-CN, F4TCNQ, TPD, TNB, TCTA, N,N'-dioctyl-3,4,9,10-perylene diimide (PTCDI-C8), or a combination thereof.

[0545] The cover layer may include the above hole transport material and may have a thickness of 50 nm to 100 nm, preferably 70 nm to 80 nm.

[0546] In the blue pixel region, the organic light emitting layer 220 of the OLED D2 includes a first blue EML 310 and a second blue EML 350 to have a tandem structure.

[0547] The first blue EML 310 includes a first blue light emitting layer 320 and a second blue light emitting layer 330. The first blue light emitting layer 320 includes a first p-type host 322, a first n-type host 324, and a first phosphorescent dopant 326. The second blue light emitting layer 330 includes a second p-type host 332, a second n-type host 334, and a second phosphorescent dopant 336. The first p-type host 322 and the second p-type host 332 are each a compound represented by Formula 1, and the first phosphorescent dopant 326 and the second phosphorescent dopant 336 are each a compound represented by Formula 7. One of the first n-type host 324 and the second n-type host 334 is a compound represented by Formula 3, and the other of the first n-type host 324 and the second n-type host 334 is a compound represented by Formula 5.

[0548] Therefore, the lifespan of the OLED D2 and the organic light emitting display device 100 of the present disclosure is increased.

[0549] Figure 6 is a schematic cross-sectional view of an OLED according to one or more embodiments of the present disclosure.

[0550] As Figure 6 shown, the OLED D3 includes a first electrode 210 and a second electrode 230 facing each other and an organic light emitting layer 220 therebetween. The organic light emitting layer 220 includes a first light emitting portion ST1 and a second light emitting portion ST2. The first light emitting portion ST1 includes a first blue EML 410, and the second light emitting portion ST2 includes a second blue EML 450. The organic light emitting layer 220 may include a CGL 490 between the first light emitting portion ST1 and the second light emitting portion ST2. The top-emitting type OLED D3 may further include a cover layer on the second electrode 230 to improve light extraction efficiency.

[0551] ( Figure 2 The organic light-emitting display device 100 may include a red pixel region, a green pixel region, and a blue pixel region, and the OLED D3 may be positioned in the blue pixel region.

[0552] One of the first electrode 210 and the second electrode 230 may be an anode, and the other of the first electrode 210 and the second electrode 230 may be a cathode. One of the first electrode 210 and the second electrode 230 may be a reflective electrode, and the other of the first electrode 210 and the second electrode 230 may be a transparent (or semi-transparent) electrode.

[0553] In the top-emitting OLED D3, the first electrode 210 may be a reflective electrode and may have a structure of ITO / Ag / ITO, and the second electrode 230 may be a transparent electrode and may be formed of Mg:Ag with a weight percentage ratio of 1:9.

[0554] In the bottom-emitting OLED D3, the first electrode 210 may be a transparent electrode and may be formed of ITO, and the second electrode 230 may be a reflective electrode and may be formed of Al.

[0555] The first light-emitting unit ST1 may further include at least one of a first HTL 444 below the first blue EML 410 and a first ETL 446 above the first blue EML 410.

[0556] In addition, the first light-emitting unit ST1 may further include a HIL 442 between the first electrode 210 and the first HTL 444.

[0557] In addition, the first light-emitting unit ST1 may further include at least one of a first EBL between the first HTL 444 and the first blue EML 410 and a first HBL between the first blue EML 410 and the first ETL 446.

[0558] The second light-emitting unit ST2 may further include at least one of a second HTL 482 below the second blue EML 450 and a second ETL 484 above the second blue EML 450.

[0559] In addition, the second light-emitting unit ST2 may further include an EIL 486 between the second electrode 230 and the second ETL 484.

[0560] In addition, the second light-emitting unit ST2 may further include at least one of a second EBL between the second HTL 482 and the second blue EML 450 and a second HBL between the second blue EML 450 and the second ETL 484.

[0561] For example, the HIL 442 may include the above-described hole injection material and may have a thickness of 1 nm to 30 nm, preferably 5 nm to 15 nm.

[0562] The first HTL 444 and the second HTL 482 may each include the above-described hole transport material and may have a thickness of 20 nm to 60 nm, preferably 30 nm to 40 nm.

[0563] The first ETL 446 and the second ETL 484 may each include the above-described electron transport material and may have a thickness of 10 nm to 100 nm, preferably 20 nm to 40 nm.

[0564] The EIL 486 may include the above-described electron injection material and may have a thickness of 0.1 nm to 10 nm, preferably 0.5 nm to 2 nm.

[0565] The first EBL and the second EBL may each include the above-described electron blocking material and may have a thickness of 5 nm to 40 nm, preferably 10 nm to 20 nm.

[0566] The first HBL and the second HBL may each include the above-described hole blocking material and may have a thickness of 1 nm to 20 nm, preferably 1 nm to 10 nm.

[0567] The CGL 490 is positioned between the first light emitting portion ST1 and the second light emitting portion ST2. That is, the first light emitting portion ST1 and the second light emitting portion ST2 are connected to each other through the CGL 490. The CGL 490 may be a PN junction CGL of an N-type CGL 492 and a P-type CGL 494.

[0568] The N-type CGL 492 is positioned between the first ETL 446 and the second HTL 482, and the P-type CGL 494 is positioned between the N-type CGL 492 and the second HTL 482.

[0569] The N-type CGL 492 supplies electrons to the first blue EML 410 of the first light emitting portion ST1, and the P-type CGL 494 supplies holes to the second blue EML 450 of the second light emitting portion ST2.

[0570] The N-type CGL 492 may include the above-described N-type charge generation material, and the P-type CGL 494 may include the above-described P-type charge generation material.

[0571] The cover layer may include the above-described hole transport material and may have a thickness of 50 nm to 100 nm, preferably 70 nm to 80 nm.

[0572] The first blue EML 410 in the first light-emitting part ST1 may have a single-layer structure. The thickness of the first blue EML 410 may be from 10 nm to 60 nm.

[0573] The first blue EML 410 may include a blue host 412 and a blue dopant (e.g., emitter) 414. The first blue EML 410 may further include a co-dopant (or co-host). In the first blue EML 410, the weight % of the blue dopant 414 may be less than the weight % of each of the blue host 412 and the co-dopant.

[0574] For example, the first blue EML 410 may be a fluorescent light-emitting layer including the compound H-1 in Formula 13 and the compound FD-1 in Formula 14.

[0575] In one aspect of the present disclosure, the first blue EML 410 may be a phosphor-sensitized fluorescence (PSF) light-emitting layer including the compound H-1 in Formula 13, the compound H-3 in Formula 13, the compound FD-2 in Formula 14, and the compound A-1 in Formula 15.

[0576] In one aspect of the present disclosure, the first blue EML 410 may be a hyperfluorescent light-emitting layer including the compound H-2 in Formula 13, the compound H-3 in Formula 13, the compound FD-2 in Formula 14, and the compound A-2 in Formula 15.

[0577] The second blue EML 450 in the second light-emitting part ST2 includes a first blue light-emitting layer 460 and a second blue light-emitting layer 470. In the second blue EML 450, the second blue light-emitting layer 470 contacts the first blue light-emitting layer 460 and is disposed on the first blue light-emitting layer 460, such that the second blue EML 450 has a bilayer structure. The first blue light-emitting layer 460 is disposed closer to the first electrode 210 as the anode than the second blue light-emitting layer 470, and the second blue light-emitting layer 470 is disposed closer to the second electrode 230 as the cathode than the first blue light-emitting layer 460.

[0578] The first blue light-emitting layer 460 includes a first p-type host 462, a first n-type host 464, and a first phosphorescent dopant 466, and the second blue light-emitting layer 470 includes a second p-type host 472, a second n-type host 474, and a second phosphorescent dopant 476. For example, the first phosphorescent dopant 466 may be referred to as the first emitter, and the second phosphorescent dopant 476 may be referred to as the second emitter.

[0579] Each of the first p-type host 462 and the second p-type host 472 is represented by Formula 1 and is independently selected from the compounds in Formula 2. The first p-type host 462 and the second p-type host 472 may be the same or different.

[0580] One of the first n-type host 464 and the second n-type host 474 is represented by Formula 3 and is selected from the compounds of Formula 4. The other of the first n-type host 464 and the second n-type host 474 is represented by Formula 5 and is selected from the compounds of Formula 6.

[0581] Each of the first phosphorescent dopant 466 and the second phosphorescent dopant 476 is represented by Formula 7 and is independently selected from the compounds of Formula 8. The first phosphorescent dopant 466 and the second phosphorescent dopant 476 may be the same or different.

[0582] The thickness of each of the first blue light-emitting layer 460 and the second blue light-emitting layer 470 may be 5 nm to 30 nm, for example, 10 nm to 20 nm. For example, the thickness of each of the first blue light-emitting layer 460 and the second blue light-emitting layer 470 may be 10 nm, 15 nm, or 20 nm.

[0583] The thickness of the first blue light-emitting layer 460 and the thickness of the second blue light-emitting layer 470 may be the same or different. In one aspect of the present disclosure, the thickness of the first blue light-emitting layer 460 and the thickness of the second blue light-emitting layer 470 may be the same.

[0584] In the first blue light-emitting layer 460, the weight percentages of the first p-type host 462 and the first n-type host 464 may be greater than the weight percentage of the first phosphorescent dopant 466, and the weight percentages of the first p-type host 462 and the first n-type host 464 may be the same or different. For example, the weight percentages of the first p-type host 462 and the first n-type host 464 may be the same.

[0585] In one aspect of the present disclosure, the first p-type host 462 may be 25 wt% to 50 wt%, the first n-type host 464 may be 25 wt% to 50 wt%, and the first phosphorescent dopant 466 may be 4 wt% to 25 wt%. In one aspect of the present disclosure, the first p-type host 462 may be 44 wt%, the first n-type host 464 may be 44 wt%, and the first phosphorescent dopant 466 may be 12 wt%.

[0586] In the second blue light-emitting layer 470, the weight percentages of the second p-type host 472 and the second n-type host 474 may be greater than the weight percentage of the second phosphorescent dopant 476, and the weight percentages of the second p-type host 472 and the second n-type host 474 may be the same or different. For example, the weight percentages of the second p-type host 472 and the second n-type host 474 may be the same.

[0587] In one aspect of the present disclosure, the second p-type host 472 may be from 25 wt% to 50 wt%, the second n-type host 474 may be from 25 wt% to 50 wt%, and the second phosphorescent dopant 476 may be from 4 wt% to 25 wt%. In one aspect of the present disclosure, the second p-type host 472 may be 44 wt%, the second n-type host 474 may be 44 wt%, and the second phosphorescent dopant 476 may be 12 wt%.

[0588] The weight percentage of the first p-type host 462 in the first blue light-emitting layer 460 and the weight percentage of the second p-type host 472 in the second blue light-emitting layer 470 may be the same or different. The weight percentage of the first n-type host 464 in the first blue light-emitting layer 460 and the weight percentage of the second n-type host 474 in the second blue light-emitting layer 470 may be the same or different. The weight percentage of the first phosphorescent dopant 466 in the first blue light-emitting layer 460 and the weight percentage of the second phosphorescent dopant 476 in the second blue light-emitting layer 470 may be the same or different.

[0589] In the present disclosure, the first n-type host 464 included in the first blue light-emitting layer 460 disposed closer to the first electrode 210 as the anode may be represented by Formula 5 and selected from the compounds of Formula 6, and the second n-type host 474 included in the second blue light-emitting layer 470 disposed closer to the second electrode 230 as the cathode may be represented by Formula 3 and selected from the compounds of Formula 4. In this case, the delayed fluorescence characteristic may be provided by the first blue light-emitting layer 460, and the exciplex characteristic may be provided by the second blue light-emitting layer 470. Therefore, the lifetime of the OLED D3 and the organic light-emitting display device 100 including the same may be significantly increased.

[0590] In the blue pixel region, the organic light-emitting layer 220 of the OLED D3 includes a first blue EML 410 and a second blue EML 450 to have a tandem structure.

[0591] The second blue EML 450 includes a first blue light-emitting layer 460 and a second blue light-emitting layer 470. The first blue light-emitting layer 460 includes a first p-type host 462, a first n-type host 464, and a first phosphorescent dopant 466, and the second blue light-emitting layer 470 includes a second p-type host 472, a second n-type host 474, and a second phosphorescent dopant 476. The first p-type host 462 and the second p-type host 472 are each a compound represented by Formula 1, and the first phosphorescent dopant 466 and the second phosphorescent dopant 476 are each a compound represented by Formula 7. One of the first n-type host 464 and the second n-type host 474 is a compound represented by Formula 3, and the other of the first n-type host 464 and the second n-type host 474 is a compound represented by Formula 5.

[0592] Accordingly, the lifetimes of the OLED D3 and the organic light emitting display device 100 of the present disclosure are increased.

[0593] Figure 7 is a schematic cross-sectional view of an OLED according to one or more embodiments of the present disclosure.

[0594] As Figure 7 shown, the OLED D4 includes a first electrode 210 and a second electrode 230 facing each other and an organic light emitting layer 220 therebetween. The organic light emitting layer 220 includes a first light emitting portion ST1 and a second light emitting portion ST2. The first light emitting portion ST1 includes a first blue EML 510, and the second light emitting portion ST2 includes a second blue EML 550. The organic light emitting layer 220 may include a CGL 590 between the first light emitting portion ST1 and the second light emitting portion ST2. The top-emitting type OLED D4 may further include a cover layer on the second electrode 230 to improve light extraction efficiency.

[0595] The organic light emitting display device 100 may include a red pixel region, a green pixel region, and a blue pixel region, and the OLED D4 may be positioned in the blue pixel region.

[0596] One of the first electrode 210 and the second electrode 230 may be an anode, and the other of the first electrode 210 and the second electrode 230 may be a cathode. One of the first electrode 210 and the second electrode 230 may be a reflective electrode, and the other of the first electrode 210 and the second electrode 230 may be a transparent (or semi-transparent) electrode.

[0597] In the top-emitting type OLED D4, the first electrode 210 may be a reflective electrode and may have a structure of ITO / Ag / ITO, and the second electrode 230 may be a transparent electrode and may be formed of Mg:Ag with a weight percentage ratio of 1:9.

[0598] In the bottom-emitting type OLED D4, the first electrode 210 may be a transparent electrode and may be formed of ITO, and the second electrode 230 may be a reflective electrode and may be formed of Al.

[0599] The first light emitting portion ST1 may further include at least one of a first HTL 544 below the first blue EML 510 and a first ETL 546 above the first blue EML 510.

[0600] In addition, the first light emitting portion ST1 may further include a HIL 542 between the first electrode 210 and the first HTL 544.

[0601] In addition, the first light-emitting unit ST1 may further include at least one of a first EBL between the first HTL 544 and the first blue EML 510 and a first HBL between the first blue EML 510 and the first ETL 546.

[0602] The second light-emitting unit ST2 may further include at least one of a second HTL 582 below the second blue EML 550 and a second ETL 584 above the second blue EML 550.

[0603] In addition, the second light-emitting unit ST2 may further include an EIL 586 between the second electrode 230 and the second ETL 584.

[0604] In addition, the second light-emitting unit ST2 may further include at least one of a second EBL between the second HTL 582 and the second blue EML 550 and a second HBL between the second blue EML 550 and the second ETL 584.

[0605] For example, the HIL 542 may contain the above hole injection material and may have a thickness of 1 nm to 30 nm, preferably 5 nm to 15 nm.

[0606] Each of the first HTL 544 and the second HTL 582 may contain the above hole transport material and may have a thickness of 20 nm to 60 nm, preferably 30 nm to 40 nm.

[0607] Each of the first ETL 546 and the second ETL 584 may contain the above electron transport material and may have a thickness of 10 nm to 100 nm, preferably 20 nm to 40 nm.

[0608] The EIL 586 may contain the above electron injection material and may have a thickness of 0.1 nm to 10 nm, preferably 0.5 nm to 2 nm.

[0609] Each of the first EBL and the second EBL may contain the above electron blocking material and may have a thickness of 5 nm to 40 nm, preferably 10 nm to 20 nm.

[0610] Each of the first HBL and the second HBL may contain the above hole blocking material and may have a thickness of 1 nm to 20 nm, preferably 1 nm to 10 nm.

[0611] The CGL 590 is positioned between the first light-emitting unit ST1 and the second light-emitting unit ST2. That is, the first light-emitting unit ST1 and the second light-emitting unit ST2 are connected to each other through the CGL 590. The CGL 590 may be a PN junction CGL of an N-type CGL 592 and a P-type CGL 594.

[0612] The N-type CGL 592 is positioned between the first ETL 546 and the second HTL 582, and the P-type CGL 594 is positioned between the N-type CGL 592 and the second HTL 582.

[0613] The N-type CGL 592 supplies electrons to the first blue EML 510 of the first light-emitting part ST1, and the P-type CGL 594 supplies holes to the second blue EML 550 of the second light-emitting part ST2.

[0614] The N-type CGL 592 may include the above-mentioned N-type charge generation material, and the P-type CGL 594 may include the above-mentioned P-type charge generation material.

[0615] The cover layer may include the above-mentioned hole transport material and may have a thickness of 50 nm to 100 nm, preferably 70 nm to 80 nm.

[0616] The first blue EML 510 in the first light-emitting part ST1 includes a first blue light-emitting layer 520 and a second blue light-emitting layer 530. In the first blue EML 510, the second blue light-emitting layer 530 contacts the first blue light-emitting layer 520 and is disposed on the first blue light-emitting layer 520, such that the first blue EML 510 has a bilayer structure. The first blue light-emitting layer 520 is disposed closer to the first electrode 210 as the anode than the second blue light-emitting layer 530, and the second blue light-emitting layer 530 is disposed closer to the second electrode 230 as the cathode than the first blue light-emitting layer 520.

[0617] The first blue light-emitting layer 520 includes a first p-type host 522, a first n-type host 524, and a first phosphorescent dopant 526, and the second blue light-emitting layer 530 includes a second p-type host 532, a second n-type host 534, and a second phosphorescent dopant 536. For example, the first phosphorescent dopant 526 may be referred to as the first emitter, and the second phosphorescent dopant 536 may be referred to as the second emitter.

[0618] Each of the first p-type host 522 and the second p-type host 532 is represented by Formula 1 and is independently selected from the compounds of Formula 2. The first p-type host 522 and the second p-type host 532 may be the same or different.

[0619] One of the first n-type host 524 and the second n-type host 534 is represented by Formula 3 and is selected from the compounds of Formula 4. The other of the first n-type host 524 and the second n-type host 534 is represented by Formula 5 and is selected from the compounds of Formula 6.

[0620] The first phosphorescent dopant 526 and the second phosphorescent dopant 536 are each represented by Formula 7 and are independently selected from the compounds of Formula 8. The first phosphorescent dopant 526 and the second phosphorescent dopant 536 may be the same or different.

[0621] The thickness of each of the first blue light-emitting layer 520 and the second blue light-emitting layer 530 may be from 5 nm to 30 nm, for example, from 10 nm to 20 nm. For example, the thickness of each of the first blue light-emitting layer 520 and the second blue light-emitting layer 530 may be 10 nm, 15 nm, or 20 nm.

[0622] The thickness of the first blue light-emitting layer 520 and the thickness of the second blue light-emitting layer 530 may be the same or different. In one aspect of the present disclosure, the thickness of the first blue light-emitting layer 520 and the thickness of the second blue light-emitting layer 530 may be the same.

[0623] In the first blue light-emitting layer 520, the weight percentages of the first p-type host 522 and the first n-type host 524 may each be greater than the weight percentage of the first phosphorescent dopant 526, and the weight percentage of the first p-type host 522 and the weight percentage of the first n-type host 524 may be the same or different. For example, the weight percentage of the first p-type host 522 and the weight percentage of the first n-type host 524 may be the same.

[0624] In one aspect of the present disclosure, the first p-type host 522 may be from 25 wt% to 50 wt%, the first n-type host 524 may be from 25 wt% to 50 wt%, and the first phosphorescent dopant 526 may be from 4 wt% to 25 wt%. In one aspect of the present disclosure, the first p-type host 522 may be 44 wt%, the first n-type host 524 may be 44 wt%, and the first phosphorescent dopant 526 may be 12 wt%.

[0625] In the second blue light-emitting layer 530, the weight percentages of the second p-type host 532 and the second n-type host 534 may each be greater than the weight percentage of the second phosphorescent dopant 536, and the weight percentage of the second p-type host 532 and the weight percentage of the second n-type host 534 may be the same or different. For example, the weight percentage of the second p-type host 532 and the weight percentage of the second n-type host 534 may be the same.

[0626] In one aspect of the present disclosure, the second p-type host 532 may be from 25 wt% to 50 wt%, the second n-type host 534 may be from 25 wt% to 50 wt%, and the second phosphorescent dopant 536 may be from 4 wt% to 25 wt%. In one aspect of the present disclosure, the second p-type host 532 may be 44 wt%, the second n-type host 534 may be 44 wt%, and the second phosphorescent dopant 536 may be 12 wt%.

[0627] The weight percentages of the first p-type host 522 in the first blue light-emitting layer 520 and the second p-type host 532 in the second blue light-emitting layer 530 may be the same or different. The weight percentages of the first n-type host 524 in the first blue light-emitting layer 520 and the second n-type host 534 in the second blue light-emitting layer 530 may be the same or different. The weight percentages of the first phosphorescent dopant 526 in the first blue light-emitting layer 520 and the second phosphorescent dopant 536 in the second blue light-emitting layer 530 may be the same or different.

[0628] In the present disclosure, the first n-type host 524 included in the first blue light-emitting layer 520 disposed closer to the first electrode 210 as an anode may be represented by Formula 5 and selected from the compounds in Formula 6, and the second n-type host 534 included in the second blue light-emitting layer 530 disposed closer to the second electrode 230 as a cathode may be represented by Formula 3 and selected from the compounds in Formula 4. In this case, the delayed fluorescence characteristic may be provided by the first blue light-emitting layer 520, and the exciplex characteristic may be provided by the second blue light-emitting layer 530. Accordingly, the lifespan of the OLED D4 and the organic light-emitting display device 100 including the same may be significantly increased.

[0629] The second blue EML 550 in the second light-emitting unit ST2 includes a third blue light-emitting layer 560 and a fourth blue light-emitting layer 570. In the second blue EML 550, the fourth blue light-emitting layer 570 contacts the third blue light-emitting layer 560 and is disposed on the third blue light-emitting layer 560 such that the second blue EML 550 has a bilayer structure. The third blue light-emitting layer 560 is disposed closer to the first electrode 210 as an anode than the fourth blue light-emitting layer 570, and the fourth blue light-emitting layer 570 is disposed closer to the second electrode 230 as a cathode than the third blue light-emitting layer 560.

[0630] The third blue light-emitting layer 560 includes a third p-type host 562, a third n-type host 564, and a third phosphorescent dopant 566, and the fourth blue light-emitting layer 570 includes a fourth p-type host 572, a fourth n-type host 574, and a fourth phosphorescent dopant 576. For example, the third phosphorescent dopant 566 may be referred to as a first emitter, and the fourth phosphorescent dopant 576 may be referred to as a second emitter.

[0631] Each of the third p-type host 562 and the fourth p-type host 572 is represented by Formula 1 and independently selected from the compounds in Formula 2. The third p-type host 562 and the fourth p-type host 572 may be the same or different.

[0632] One of the third n-type host 564 and the fourth n-type host 574 is represented by Formula 3 and is selected from the compounds of Formula 4. The other of the third n-type host 564 and the fourth n-type host 574 is represented by Formula 5 and is selected from the compounds of Formula 6.

[0633] Each of the third phosphorescent dopant 566 and the fourth phosphorescent dopant 576 is represented by Formula 7 and is independently selected from the compounds of Formula 8. The third phosphorescent dopant 566 and the fourth phosphorescent dopant 576 may be the same or different.

[0634] The thickness of each of the third blue light-emitting layer 560 and the fourth blue light-emitting layer 570 may be 5 nm to 30 nm, for example, 10 nm to 20 nm. For example, the thickness of each of the third blue light-emitting layer 560 and the fourth blue light-emitting layer 570 may be 10 nm, 15 nm, or 20 nm.

[0635] The thickness of the third blue light-emitting layer 560 and the thickness of the fourth blue light-emitting layer 570 may be the same or different. In one aspect of the present disclosure, the thickness of the third blue light-emitting layer 560 and the thickness of the fourth blue light-emitting layer 570 may be the same.

[0636] In the third blue light-emitting layer 560, the weight percentage of each of the third p-type host 562 and the third n-type host 564 may be greater than the weight percentage of the third phosphorescent dopant 566, and the weight percentage of the third p-type host 562 and the weight percentage of the third n-type host 564 may be the same or different. For example, the weight percentage of the third p-type host 562 and the weight percentage of the third n-type host 564 may be the same.

[0637] In one aspect of the present disclosure, the third p-type host 562 may be 25 wt% to 50 wt%, the third n-type host 564 may be 25 wt% to 50 wt%, and the third phosphorescent dopant 566 may be 4 wt% to 25 wt%. In one aspect of the present disclosure, the third p-type host 562 may be 44 wt%, the third n-type host 564 may be 44 wt%, and the third phosphorescent dopant 566 may be 12 wt%.

[0638] In the fourth blue light-emitting layer 570, the weight percentage of each of the fourth p-type host 572 and the fourth n-type host 574 may be greater than the weight percentage of the fourth phosphorescent dopant 576, and the weight percentage of the fourth p-type host 572 and the weight percentage of the fourth n-type host 574 may be the same or different. For example, the weight percentage of the fourth p-type host 572 and the weight percentage of the fourth n-type host 574 may be the same.

[0639] In one aspect of the present disclosure, the fourth p-type host 572 can be 25 wt% to 50 wt%, the fourth n-type host 574 can be 25 wt% to 50 wt%, and the fourth phosphorescent dopant 576 can be 4 wt% to 25 wt%. In one aspect of the present disclosure, the fourth p-type host 572 can be 44 wt%, the fourth n-type host 574 can be 44 wt%, and the fourth phosphorescent dopant 576 can be 12 wt%.

[0640] The wt% of the third p-type host 562 in the third blue-emitting layer 560 and the wt% of the fourth p-type host 572 in the fourth blue-emitting layer 570 can be the same or different. The wt% of the third n-type host 564 in the third blue-emitting layer 560 and the wt% of the fourth n-type host 574 in the fourth blue-emitting layer 570 can be the same or different. The wt% of the third phosphorescent dopant 566 in the third blue-emitting layer 560 and the wt% of the fourth phosphorescent dopant 576 in the fourth blue-emitting layer 570 can be the same or different.

[0641] In the present disclosure, the third n-type host 564 included in the third blue-emitting layer 560 disposed closer to the first electrode 210 as the anode can be represented by Formula 5 and selected from the compounds of Formula 6, and the fourth n-type host 574 included in the fourth blue-emitting layer 570 disposed closer to the second electrode 230 as the cathode can be represented by Formula 3 and selected from the compounds of Formula 4. In this case, the delayed fluorescence characteristic can be provided by the third blue-emitting layer 560, and the exciplex characteristic can be provided by the fourth blue-emitting layer 570. Accordingly, the lifespan of the OLED D4 and the organic light-emitting display device 100 including the same can be significantly increased.

[0642] In the blue pixel region, the organic light-emitting layer 220 of the OLED D4 includes the first blue EML 510 and the second blue EML 550 to have a tandem structure.

[0643] The first blue EML 510 includes a first blue-emitting layer 520 and a second blue-emitting layer 530. The first blue-emitting layer 520 includes a first p-type host 522, a first n-type host 524, and a first phosphorescent dopant 526. The second blue-emitting layer 530 includes a second p-type host 532, a second n-type host 534, and a second phosphorescent dopant 536. The first p-type host 522 and the second p-type host 532 are each a compound represented by Formula 1, and the first phosphorescent dopant 526 and the second phosphorescent dopant 536 are each a compound represented by Formula 7. One of the first n-type host 524 and the second n-type host 534 is a compound represented by Formula 3, and the other of the first n-type host 524 and the second n-type host 534 is a compound represented by Formula 5.

[0644] The second blue EML 550 includes a third blue light-emitting layer 560 and a fourth blue light-emitting layer 570. The third blue light-emitting layer 560 includes a third p-type host 562, a third n-type host 564, and a third phosphorescent dopant 566. The fourth blue light-emitting layer 570 includes a fourth p-type host 572, a fourth n-type host 574, and a fourth phosphorescent dopant 576. Each of the third p-type host 562 and the fourth p-type host 572 is a compound represented by Formula 1. Each of the third phosphorescent dopant 566 and the fourth phosphorescent dopant 576 is a compound represented by Formula 7. One of the third n-type host 564 and the fourth n-type host 574 is a compound represented by Formula 3, and the other of the third n-type host 564 and the fourth n-type host 574 is a compound represented by Formula 5.

[0645] Therefore, the lifetimes of the OLED D4 and the organic light-emitting display device 100 of the present disclosure are increased.

[0646] Figure 8 is a schematic cross-sectional view showing an organic light-emitting display device according to one or more embodiments of the present disclosure.

[0647] As Figure 8 shown, the organic light-emitting display device 600 includes: a first substrate 610 in which a red pixel region RP, a green pixel region GP, and a blue pixel region BP are defined; a second substrate 670 facing the first substrate 610; an OLED D positioned between the first substrate 610 and the second substrate 670 and providing blue light emission; and a color conversion layer 680 between the OLED D and the second substrate 670.

[0648] In some embodiments, a color filter may be formed between the second substrate 670 and each color conversion layer 680.

[0649] Each of the first substrate 610 and the second substrate 670 may be a glass substrate or a flexible substrate. For example, the flexible substrate may be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate, or a polycarbonate (PC) substrate.

[0650] On the first substrate 610, TFTs Tr corresponding to each of the red pixel region RP, the green pixel region GP, and the blue pixel region BP are formed, and a planarization layer 650 (which has a drain contact hole 652 exposing an electrode (e.g., a drain electrode) of the TFT Tr) is formed to cover the TFT Tr.

[0651] An OLED D including a first electrode 210, an organic light-emitting layer 220, and a second electrode 230 is formed on a planarization layer 650. In this case, the first electrode 210 may be connected to the drain electrode of the TFT Tr through a drain contact hole 652.

[0652] One of the first electrode 210 and the second electrode 230 may be an anode, and the other of the first electrode 210 and the second electrode 230 may be a cathode. One of the first electrode 210 and the second electrode 230 may be a reflective electrode, and the other of the first electrode 210 and the second electrode 230 may be a transparent (or semi-transparent) electrode.

[0653] In a top-emission type OLED D, the first electrode 210 may be a reflective electrode and may have a structure of ITO / Ag / ITO, and the second electrode may be a transparent electrode and may be formed of Mg:Ag with a weight ratio of 1:9. In a bottom-emission type OLED D, the first electrode 210 may be a transparent electrode and may be formed of ITO, and the second electrode may be a reflective electrode and may be formed of Al.

[0654] A bank layer 666 is formed on the planarization layer 650 to cover the edge of the first electrode 210. That is, the bank layer 666 is positioned at the boundary of each of the red pixel region, the green pixel region, and the blue pixel region and exposes the center of the first electrode 210 in each of the red pixel region RP, the green pixel region GP, and the blue pixel region BP.

[0655] The OLED D emits blue light and may have Figure 3 、 Figure 5 、 Figure 6 and Figure 7 the structure shown in. That is, the OLED D is formed in each of the red pixel region RP, the green pixel region GP, and the blue pixel region BP and provides blue light.

[0656] For example, referring to Figure 3 , the organic light-emitting layer 220 of the OLED D includes a blue EML 240, and the blue EML 240 includes a first blue light-emitting layer 250 and a second blue light-emitting layer 260. The first blue light-emitting layer 250 contains a first p-type host 252, a first n-type host 254, and a first phosphorescent dopant 256, and the second blue light-emitting layer 260 contains a second p-type host 262, a second n-type host 264, and a second phosphorescent dopant 266.

[0657] The first p-type host 252 in the first blue light-emitting layer 250 and the second p-type host 262 in the second blue light-emitting layer 260 are each a compound represented by Formula 1 and are independently selected from the compounds in Formula 2. One of the first n-type host 254 in the first blue light-emitting layer 250 and the second n-type host 264 in the second blue light-emitting layer 260 is a compound represented by Formula 3 and is selected from the compounds in Formula 4. The other of the first n-type host 254 in the first blue light-emitting layer 250 and the second n-type host 264 in the second blue light-emitting layer 260 is a compound represented by Formula 5 and is selected from the compounds in Formula 6. The first phosphorescent dopant 256 and the second phosphorescent dopant 266 are each represented by Formula 7 and are independently selected from the compounds in Formula 8.

[0658] Since the OLED D emits blue light in each of the red pixel region RP, the green pixel region GP, and the blue pixel region BP, the organic light-emitting layer 220 can be integrally formed as a common layer in the red pixel region RP, the green pixel region GP, and the blue pixel region BP without separation. The bank layer 666 can be formed to prevent current leakage at the edge of the first electrode 210 and can be omitted.

[0659] The color conversion layer 680 includes a first color conversion layer 682 corresponding to the red pixel region RP and a second color conversion layer 684 corresponding to the green pixel region GP. For example, the color conversion layer 680 may include an inorganic color conversion material such as quantum dots. There is no color conversion layer in the blue pixel region BP so that the OLED D in the blue pixel region BP can directly face the second substrate 670.

[0660] The blue light from the OLED D is converted into red light by the first color conversion layer 682 in the red pixel region RP, and the blue light from the OLED D is converted into green light by the second color conversion layer 684 in the green pixel region GP.

[0661] Therefore, the organic light-emitting display device 600 can display a full-color image.

[0662] When the light from the OLED D passes through the first substrate 610 to display an image, the color conversion layer 680 may be disposed between the OLED D and the first substrate 610.

[0663] Figure 9 is a schematic cross-sectional view showing an organic light-emitting display device according to one or more embodiments of the present disclosure.

[0664] As Figure 9As shown, the organic light-emitting display device 700 includes: a first substrate 710 in which a red pixel region RP, a green pixel region GP, and a blue pixel region BP are defined; a second substrate 770 facing the first substrate 710; an OLED D positioned between the first substrate 710 and the second substrate 770 and providing white light emission; and a color filter layer 780 between the OLED D and the second substrate 770.

[0665] Each of the first substrate 710 and the second substrate 770 may be a glass substrate or a flexible substrate. For example, the flexible substrate may be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate, or a polycarbonate (PC) substrate.

[0666] A buffer layer 720 is formed on the first substrate 710, and a TFT Tr corresponding to each of the red pixel region RP, the green pixel region GP, and the blue pixel region BP is formed on the buffer layer 720. The buffer layer 720 may be omitted.

[0667] A semiconductor layer 722 is formed on the buffer layer 720. The semiconductor layer 722 may include an oxide semiconductor material or polysilicon.

[0668] A gate insulating layer 724 is formed on the semiconductor layer 722. The gate insulating layer 724 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

[0669] A gate electrode 730 formed of a conductive material (e.g., metal) is formed on the gate insulating layer 724 corresponding to the center of the semiconductor layer 722.

[0670] An interlayer insulating layer 732 formed of an insulating material is formed on the gate electrode 730. The interlayer insulating layer 732 may be formed of an inorganic insulating material (e.g., silicon oxide or silicon nitride) or an organic insulating material (e.g., benzocyclobutene or photoacrylic).

[0671] The interlayer insulating layer 732 includes a first contact hole 734 and a second contact hole 736 that expose both sides of the semiconductor layer 722. The first contact hole 734 and the second contact hole 736 are positioned on both sides of the gate electrode 730 and spaced apart from the gate electrode 730.

[0672] A source electrode 740 and a drain electrode 742 formed of a conductive material (e.g., metal) are formed on the interlayer insulating layer 732.

[0673] The source electrode 740 and the drain electrode 742 are spaced apart from each other with respect to the gate electrode 730, and contact both sides of the semiconductor layer 722 through the first contact hole 734 and the second contact hole 736, respectively.

[0674] The semiconductor layer 722, the gate electrode 730, the source electrode 740, and the drain electrode 742 constitute the TFT Tr. The TFT Tr serves as a driving element. That is, the TFT Tr can correspond to the driving TFT Td of ( Figure 1 ).

[0675] In some embodiments, the gate line and the data line cross each other to define a pixel region, and the switching TFT is formed to be connected to the gate line and the data line. The switching TFT is connected to the TFT Tr that serves as a driving element.

[0676] In addition, a power supply line and a storage capacitor can be formed. The power supply line can be formed to be parallel to and spaced apart from one of the gate line and the data line. The storage capacitor is used to hold the voltage of the gate electrode of the TFT Tr in one frame.

[0677] A planarization layer 750 is formed to cover the TFT Tr. The planarization layer 750 includes a drain contact hole 752 that exposes the drain electrode 742 of the TFT Tr.

[0678] The first electrode 810 connected to the drain electrode 742 of the TFT Tr through the drain contact hole 752 is separately formed in each pixel region and formed on the planarization layer 750. The first electrode 810 can be an anode and can be formed of a conductive material having a relatively high work function. For example, the first electrode 810 can include a transparent conductive oxide layer and a reflective layer formed of a transparent conductive oxide (TCO).

[0679] For example, the transparent conductive oxide material layer of the first electrode 810 can be formed of one of the following: indium-tin oxide (ITO), indium-zinc oxide (IZO), indium-tin-zinc oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium-copper oxide (ICO), and aluminum-zinc oxide (Al:ZnO, AZO).

[0680] For example, the reflective layer can be formed of one of the following: silver (Ag), palladium (Pd), copper (Cu), indium (In), and an alloy of one of neodymium (Nd) and Ag, and an aluminum-palladium-copper (APC) alloy. For example, the first electrode 210 can have a bilayer structure of Ag / ITO or APC / ITO or a trilayer structure of ITO / Ag / ITO or ITO / APC / ITO.

[0681] On the planarization layer 750, a bank layer 766 is formed to cover the edges of the first electrode 810. That is, the bank layer 766 is positioned at the boundary of the pixel region and exposes the center of the first electrode 810 in the pixel region. Since the OLED D emits blue light in each of the red pixel region RP, the green pixel region GP, and the blue pixel region BP, the organic light-emitting layer 820 can be integrally formed as a common layer in the red pixel region RP, the green pixel region GP, and the blue pixel region BP without separation. The bank layer 766 can be formed to prevent current leakage at the edges of the first electrode 810, and it can be omitted.

[0682] An organic light-emitting layer 820 is formed on the first electrode 810.

[0683] Above the first substrate 710 in which the organic light-emitting layer 820 is formed, a second electrode 830 is formed. The second electrode 830 is disposed above the entire surface of the display device and can be formed of a conductive material having a relatively low work function to be used as a cathode. For example, the second electrode 830 can be formed of Al, Mg, Ca, Ag, or an alloy thereof such as Mg:Ag.

[0684] In the organic light-emitting display device 700, since the light emitted from the organic light-emitting layer 820 is incident on the color filter layer 780 through the second electrode 830, the second electrode 830 has a thin profile for light transmission.

[0685] The first electrode 810, the organic light-emitting layer 820, and the second electrode 830 constitute the OLED D.

[0686] The color filter layer 780 is positioned above the OLED D and includes a red color filter 782, a green color filter 784, and a blue color filter 786 corresponding to the red pixel region RP, the green pixel region GP, and the blue pixel region BP, respectively. The red color filter 782 contains at least one of a red dye and a red pigment, the green color filter 784 contains at least one of a green dye and a green pigment, and the blue color filter 786 contains at least one of a blue dye and a blue pigment.

[0687] The color filter layer 780 can be attached to the OLED D using an adhesive layer. Alternatively, the color filter layer 780 can be directly formed on the OLED D. When a encapsulation layer (or encapsulation film) is formed to cover the OLED D, the color filter layer 780 can be formed on the encapsulation layer.

[0688] An encapsulation layer (or encapsulation film) can be formed to prevent moisture from penetrating into the OLED D. For example, the encapsulation film can include a first inorganic insulating layer, an organic insulating layer, and a second inorganic insulating layer stacked in sequence, but is not limited thereto. The encapsulation film can be omitted.

[0689] A polarizing plate for reducing ambient light reflection can be provided above the outside of the second substrate 770 of the top-emitting type OLED D. For example, the polarizing plate can be a circular polarizing plate.

[0690] In Figure 9 the OLED D, the first electrode 810 and the second electrode 830 are a reflective electrode and a transparent (or semi-transparent) electrode, respectively, and the color filter layer 780 is provided above the OLED D.

[0691] Alternatively, the first electrode 810 and the second electrode 830 can be a transparent (or semi-transparent) electrode and a reflective electrode, respectively, and the color filter layer 780 can be provided between the OLED D and the first substrate 710. In this case, the first electrode 810 can have a single-layer structure of a transparent conductive oxide layer.

[0692] A color conversion layer can be formed between the OLED D and the color filter layer 780. The color conversion layer can include a red color conversion layer, a green color conversion layer, and a blue color conversion layer corresponding to a red pixel region RP, a green pixel region GP, and a blue pixel region BP, respectively. The white light from the OLED D is converted into red light, green light, and blue light through the red color conversion layer, the green color conversion layer, and the blue color conversion layer, respectively.

[0693] The color conversion layer can be included instead of the color filter layer 780.

[0694] As described above, in the organic light-emitting display device 700, the OLED D in the red pixel region RP, the green pixel region GP, and the blue pixel region BP emits white light, and the white light from the organic light-emitting diode D passes through the red color filter 782, the green color filter 784, and the blue color filter 786. As a result, red light, green light, and blue light are provided by the red pixel region RP, the green pixel region GP, and the blue pixel region BP, respectively.

[0695] In Figure 9 the OLED D that emits white light is used for a display device. Alternatively, the OLED D can be formed on the entire surface of the substrate without at least one of a driving element and a color filter layer for a lighting device. A display device and a lighting device each including the OLED D of the present disclosure can be referred to as an organic light-emitting device.

[0696] Figure 10 is a schematic cross-sectional view of an OLED according to one or more embodiments of the present disclosure.

[0697] As Figure 10As shown, the OLED D5 includes a first electrode 810 and a second electrode 830 facing each other, and an organic light-emitting layer 820 therebetween. The organic light-emitting layer 820 includes a first light-emitting portion ST1, a second light-emitting portion ST2, and a third light-emitting portion ST3. The first light-emitting portion ST1 includes a first EML (e.g., a first blue EML) 910, the second light-emitting portion ST2 includes a second EML (e.g., a second blue EML) 940, and the third light-emitting portion ST3 includes a third EML 970. The organic light-emitting layer 820 may further include a first CGL 980 between the first light-emitting portion ST1 and the third light-emitting portion ST3 and a second CGL 990 between the second light-emitting portion ST2 and the third light-emitting portion ST3. The top-emission type OLED D5 may further include a cover layer on the second electrode 830 to improve light extraction efficiency.

[0698] The organic light-emitting display device 700 may include a red pixel region RP, a green pixel region GP, and a blue pixel region BP, and the OLED D5 may be positioned in the red pixel region RP, the green pixel region GP, and the blue pixel region BP and emit white light.

[0699] One of the first electrode 810 and the second electrode 830 may be an anode, and the other of the first electrode 810 and the second electrode 830 may be a cathode. One of the first electrode 810 and the second electrode 830 may be a reflective electrode, and the other of the first electrode 810 and the second electrode 830 may be a transparent (or semi-transparent) electrode.

[0700] In the top-emission type OLED D5, the first electrode 810 may be a reflective electrode and may have a structure of ITO / Ag / ITO, and the second electrode 830 may be a transparent electrode and may be formed of Mg:Ag with a weight percentage ratio of 1:9.

[0701] In the bottom-emission type OLED D5, the first electrode 810 may be a transparent electrode and may be formed of ITO, and the second electrode 830 may be a reflective electrode and may be formed of Al.

[0702] The first light-emitting portion ST1 may further include at least one of a first HTL 914 below the first blue EML 910 and a first ETL 916 above the first blue EML 910.

[0703] In addition, the first light-emitting portion ST1 may further include a HIL 912 between the first electrode 810 and the first HTL 914.

[0704] In addition, the first light-emitting unit ST1 may further include at least one of a first EBL between the first HTL 914 and the first blue EML 910 and a first HBL between the first blue EML 910 and the first ETL 916.

[0705] The second light-emitting unit ST2 may further include at least one of a second HTL 942 under the second blue EML 940 and a second ETL 944 above the second blue EML 940.

[0706] In addition, the second light-emitting unit ST2 may further include an EIL 946 between the second electrode 830 and the second ETL 944.

[0707] In addition, the second light-emitting unit ST2 may further include at least one of a second EBL between the second HTL 942 and the second EML 940 and a second HBL between the second EML 940 and the second ETL 944.

[0708] In the third light-emitting unit ST3, the third EML 970 may include a red EML 970a, a yellow-green EML 970c, and a green EML 970b. In this case, the yellow-green EML 970c is disposed between the red EML 970a and the green EML 970b. Alternatively, the yellow-green EML 970c may be omitted, and the third EML 970 may have a double-layer structure including the red EML 970a and the green EML 970b.

[0709] The red EML 970a includes a red host and a red dopant, the green EML 970b includes a green host and a green dopant, and the yellow-green EML 970c includes a yellow-green host and a yellow-green dopant. Each of the red dopant, the green dopant, and the yellow-green dopant may be one of a fluorescent compound, a phosphorescent compound, and a delayed fluorescence compound.

[0710] For example, the red host can be selected from mCP-CN, CBP, mCBP, mCP, DPEPO, 2,8-bis(diphenylphosphoryl)dibenzothiophene (PPT), 1,3,5-tris[(3-pyridinyl)-benz-3-yl]benzene (TmPyPB), 2,6-bis(9H-carbazol-9-yl)pyridine (PYD-2Cz), 2,8-bis(9H-carbazol-9-yl)dibenzothiophene (DCzDBT), 3’,5’-bis(carbazol-9-yl)-[1,1’-biphenyl]-3,5-dicarbonitrile (DCzTPA), 4’-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (pCzB-2CN), 3’-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (mCzB-2CN), TSPO1, 9-(9-phenyl-9H-carbazol-6-yl)-9H-carbazole (CCP), 4-(3-(triphenylene-2-yl)phenyl)dibenzothiophene, 9-(4-(9H-carbazol-9-yl)phenyl)-9H-3,9’-bicarbazole, 9-(3-(9H-carbazol-9-yl)phenyl)-9H-3,9’-bicarbazole, 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-9H-3,9’-bicarbazole, 9,9’-diphenyl-9H,9’H-3,3’-bicarbazole (BCzPh), 1,3,5-tris(carbazol-9-yl)benzene (TCP), TCTA, 4,4’-bis(carbazol-9-yl)-2,2’-dimethylbiphenyl (CDBP), 2,7-bis(carbazol-9-yl)-9,9-dimethylfluorene (DMFL-CBP), 2,2’,7,7’-tetrakis(carbazol-9-yl)-9,9-spirobifluorene (spiro-CBP), and 3,6-bis(carbazol-9-yl)-9-(2-ethyl-hexyl)-9H-carbazole (TCz1), but not limited thereto.

[0711] The red dopant may be selected from bis(2-(4,6-dimethyl)phenylquinoline)(2,2,6,6-tetramethylheptane-3,5-dionato)iridium(III), bis[2-(4-n-hexylphenyl)quinoline](acetylacetonate)iridium(III)(Hex-Ir(phq)2(acac)), tris[2-(4-n-hexylphenyl)quinoline]iridium(III)(Hex-Ir(phq)3), tris[2-phenyl-4-methylquinoline]iridium(III)(Ir(Mphq)3), bis(2-phenylquinoline)(2,2,6,6-tetramethylheptene-3,5-dionato)iridium(III)(Ir(dpm)PQ2), bis(phenylisoquinoline)(2,2,6,6-tetramethylheptene-3,5-dionato)iridium(III)(Ir(dpm)(piq)2), bis[(4-n-hexylphenyl)isoquinoline](acetylacetonate)iridium(III)(Hex-Ir(piq)2(acac)), tris[2-(4-n-hexylphenyl)isoquinoline]iridium(III)(Hex-Ir(piq)3), tris(2-(3-methylphenyl)-7-methyl-quinoline)iridium(Ir(dmpq)3), bis[2-(2-methylphenyl)-7-methyl-quinoline](acetylacetonate)iridium(III)(Ir(dmpq)2(acac)), bis[2-(3,5-dimethylphenyl)-4-methyl-quinoline(acetylacetonate)iridium(III))(Ir(mphmq)2(acac)), and tris(dibenzoylmethane)mono(1,10-phenanthroline)europium(III)(Eu(dbm)3(phen)), but not limited thereto.

[0712] The green host and the yellow-green host may each independently be selected from mCP-CN, CBP, mCBP, mCP, DPEPO, 2,8-bis(diphenylphosphoryl)dibenzothiophene(PPT), TmPyPB, PYD-2Cz, 2,8-bis(9H-carbazol-9-yl)dibenzothiophene(DCzDBT), 3’,5’-bis(carbazol-9-yl)-[1,1’-biphenyl]-3,5-dicarbonitrile(DCzTPA), 4’-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile(pCzB-2CN), 3’-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile(mCzB-2CN), TSPO1, and 9-(9-phenyl-9H-carbazol-6-yl)-9H-carbazole(CCP), but not limited thereto.

[0713] The green dopant may be selected from bis(2-phenylpyridine)(pyridin-2-ylbenzofuro[2,3-b]pyridine)iridium), tris[2-phenylpyridine]iridium(III) (Ir(ppy)3), fac-tris(2-phenylpyridine)iridium(III) (fac-Ir(ppy)3), bis(2-phenylpyridine)(acetylacetonate)iridium(III) (Ir(ppy)2(acac)), tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)3), bis(2-(naphthalen-2-yl)pyridine)(acetylacetonate)iridium(III) (Ir(npy)2acac), tris(2-phenyl-3-methyl-pyridine)iridium (Ir(3mppy)3), and fac-tris(2-(3-p-xylyl)phenyl)pyridineiridium(III) (TEG), but is not limited thereto.

[0714] The yellow-green dopant may be selected from 5,6,11,12-tetraphenylnaphthalene (rubrene), 2,8-di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb), bis(2-phenylbenzothiazole)(acetylpyruvic acid)iridium(III) (Ir(BT)2(acac)), bis(2-(9,9-diethyl-fluoren-2-yl)-1-phenyl-1H-benzo[d]imidazole)(acetylpyruvic acid)iridium(III) (Ir(fbi)2(acac)), bis(2-phenylpyridine)(3-(pyridin-2-yl)-2H-chromene-2-carboxylic acid)iridium(III) (fac-Ir(ppy)2Pc), bis(2-(2,4-difluorophenyl)quinoline)(pyridinecarboxylic acid)iridium(III) (FPQIrpic), and bis(4-phenylthieno[3,2-c]pyridine-N,C2’)(acetylpyruvic acid)iridium(III) (PO-01), but is not limited thereto.

[0715] The third light-emitting unit ST3 may include at least one of a third HTL 972 below the third EML 970 and a third ETL 974 above the third EML 970.

[0716] In addition, the third light-emitting unit ST3 may further include at least one of a third EBL between the third HTL 972 and the third EML 970 and a third HBL between the third EML 970 and the third ETL 974.

[0717] For example, the HIL 912 may contain the above hole injection material and may have a thickness of 1 nm to 30 nm, preferably 5 nm to 15 nm.

[0718] Each of the first HTL to the third HTL 914, 942, and 972 may contain the above hole transport material and may have a thickness of 20 nm to 60 nm, preferably 30 nm to 40 nm.

[0719] The first ETL to the third ETL 916, 944, and 974 may each contain the above-mentioned electron transport material and may have a thickness of 10 nm to 50 nm, preferably 20 nm to 40 nm.

[0720] The EIL 946 may contain the above-mentioned electron injection material and may have a thickness of 0.1 nm to 10 nm, preferably 0.5 nm to 2 nm.

[0721] The first EBL to the third EBL may each contain the above-mentioned electron blocking material and may have a thickness of 5 nm to 40 nm, preferably 10 nm to 20 nm.

[0722] The first HBL to the third HBL may each contain the above-mentioned hole blocking material and may have a thickness of 1 nm to 20 nm, preferably 1 nm to 10 nm.

[0723] The first CGL 980 is positioned between the first light-emitting unit ST1 and the third light-emitting unit ST3, and the second CGL 990 is positioned between the second light-emitting unit ST2 and the third light-emitting unit ST3. That is, the first light-emitting unit ST1, the first CGL 980, the third light-emitting unit ST3, the second CGL 990, and the second light-emitting unit ST2 are sequentially stacked on the first electrode 810. In other words, the first light-emitting unit ST1 is positioned between the first electrode 810 and the first CGL 980, the third light-emitting unit ST3 is positioned between the first CGL 980 and the second CGL 990, and the second light-emitting unit ST2 is positioned between the second CGL 990 and the second electrode 830.

[0724] The first CGL 980 may be a P-N junction CGL of the first N-type CGL 982 and the first P-type CGL 984, and the second CGL 990 may be a P-N junction CGL of the second N-type CGL 992 and the second P-type CGL 994.

[0725] In the first CGL 980, the first N-type CGL 982 is positioned between the first ETL 916 and the third HTL 972, and the first P-type CGL 984 is positioned between the first N-type CGL 982 and the third HTL 972.

[0726] In the second CGL 990, the second N-type CGL 992 is positioned between the third ETL 974 and the second HTL 942, and the second P-type CGL 994 is positioned between the second N-type CGL 992 and the second HTL 942.

[0727] The first N-type CGL 982 and the second N-type CGL 992 may each contain the above-mentioned N-type charge generation material, and the first P-type CGL 984 and the second P-type CGL 994 may each contain the above-mentioned P-type charge generation material.

[0728] The cover layer may contain the above-mentioned hole transport material and may have a thickness of 50 nm to 100 nm, preferably 70 nm to 80 nm.

[0729] The first blue EML 910 in the first light-emitting portion ST1 includes a first blue light-emitting layer 920 and a second blue light-emitting layer 930. In the first blue EML 910, the second blue light-emitting layer 930 contacts the first blue light-emitting layer 920 and is disposed on the first blue light-emitting layer 920, such that the first blue EML 910 has a double-layer structure. The first blue light-emitting layer 920 is disposed closer to the first electrode 810 as the anode than the second blue light-emitting layer 930, and the second blue light-emitting layer 930 is disposed closer to the second electrode 830 as the cathode than the first blue light-emitting layer 920.

[0730] The first blue light-emitting layer 920 contains a first p-type host 922, a first n-type host 924, and a first phosphorescent dopant 926, and the second blue light-emitting layer 930 contains a second p-type host 932, a second n-type host 934, and a second phosphorescent dopant 936. For example, the first phosphorescent dopant 926 may be referred to as the first emitter, and the second phosphorescent dopant 936 may be referred to as the second emitter.

[0731] The first p-type host 922 and the second p-type host 932 are each represented by Formula 1 and are independently selected from the compounds of Formula 2. The first p-type host 922 and the second p-type host 932 may be the same or different.

[0732] One of the first n-type host 924 and the second n-type host 934 is represented by Formula 3 and is selected from the compounds of Formula 4. The other of the first n-type host 924 and the second n-type host 934 is represented by Formula 5 and is selected from the compounds of Formula 6.

[0733] The first phosphorescent dopant 926 and the second phosphorescent dopant 936 are each represented by Formula 7 and are independently selected from the compounds of Formula 8. The first phosphorescent dopant 926 and the second phosphorescent dopant 936 may be the same or different.

[0734] The thickness of each of the first blue light-emitting layer 920 and the second blue light-emitting layer 930 may be 5 nm to 30 nm, for example, 10 nm to 20 nm. For example, the thickness of each of the first blue light-emitting layer 920 and the second blue light-emitting layer 930 may be 10 nm, 15 nm, or 20 nm.

[0735] The thickness of the first blue light-emitting layer 920 and the thickness of the second blue light-emitting layer 930 may be the same or different. In one aspect of the present disclosure, the thickness of the first blue light-emitting layer 920 and the thickness of the second blue light-emitting layer 930 may be the same.

[0736] In the first blue light-emitting layer 920, the weight percentages of the first p-type host 922 and the first n-type host 924 may each be greater than the weight percentage of the first phosphorescent dopant 926, and the weight percentages of the first p-type host 922 and the first n-type host 924 may be the same or different. For example, the weight percentages of the first p-type host 922 and the first n-type host 924 may be the same.

[0737] In one aspect of the present disclosure, the first p-type host 922 may be 25 wt% to 50 wt%, the first n-type host 924 may be 25 wt% to 50 wt%, and the first phosphorescent dopant 926 may be 4 wt% to 25 wt%. In one aspect of the present disclosure, the first p-type host 922 may be 44 wt%, the first n-type host 924 may be 44 wt%, and the first phosphorescent dopant 926 may be 12 wt%.

[0738] In the second blue light-emitting layer 930, the weight percentages of the second p-type host 932 and the second n-type host 934 may each be greater than the weight percentage of the second phosphorescent dopant 936, and the weight percentages of the second p-type host 932 and the second n-type host 934 may be the same or different. For example, the weight percentages of the second p-type host 932 and the second n-type host 934 may be the same.

[0739] In one aspect of the present disclosure, the second p-type host 932 may be 25 wt% to 50 wt%, the second n-type host 934 may be 25 wt% to 50 wt%, and the second phosphorescent dopant 936 may be 4 wt% to 25 wt%. In one aspect of the present disclosure, the second p-type host 932 may be 44 wt%, the second n-type host 934 may be 44 wt%, and the second phosphorescent dopant 936 may be 12 wt%.

[0740] The weight percentage of the first p-type host 922 in the first blue light-emitting layer 920 and the weight percentage of the second p-type host 932 in the second blue light-emitting layer 930 may be the same or different. The weight percentage of the first n-type host 924 in the first blue light-emitting layer 920 and the weight percentage of the second n-type host 934 in the second blue light-emitting layer 930 may be the same or different. The weight percentage of the first phosphorescent dopant 926 in the first blue light-emitting layer 920 and the weight percentage of the second phosphorescent dopant 936 in the second blue light-emitting layer 930 may be the same or different.

[0741] In the present disclosure, the first n-type host 924 included in the first blue light-emitting layer 920 disposed closer to the first electrode 810 serving as an anode may be represented by Formula 5 and is selected from the compounds of Formula 6, and the second n-type host 934 included in the second blue light-emitting layer 930 disposed closer to the second electrode 830 serving as a cathode may be represented by Formula 3 and is selected from the compounds of Formula 4. In this case, the delayed fluorescence characteristics may be provided by the first blue light-emitting layer 920, and the exciplex characteristics may be provided by the second blue light-emitting layer 930. Accordingly, the lifespan of the OLED D5 and the organic light-emitting display device 700 including the same may be significantly increased.

[0742] The second blue EML 940 in the second light-emitting unit ST2 includes a third blue light-emitting layer 950 and a fourth blue light-emitting layer 960. In the second blue EML 940, the fourth blue light-emitting layer 960 contacts the third blue light-emitting layer 950 and is disposed on the third blue light-emitting layer 950 such that the second blue EML 940 has a bilayer structure. The third blue light-emitting layer 950 is disposed closer to the first electrode 810 serving as an anode than the fourth blue light-emitting layer 960, and the fourth blue light-emitting layer 960 is disposed closer to the second electrode 830 serving as a cathode than the third blue light-emitting layer 950.

[0743] The third blue light-emitting layer 950 includes a third p-type host 952, a third n-type host 954, and a third phosphorescent dopant 956, and the fourth blue light-emitting layer 960 includes a fourth p-type host 962, a fourth n-type host 964, and a fourth phosphorescent dopant 966. For example, the third phosphorescent dopant 956 may be referred to as a first emitter, and the fourth phosphorescent dopant 966 may be referred to as a second emitter.

[0744] Each of the third p-type host 952 and the fourth p-type host 962 is represented by Formula 1 and is independently selected from the compounds of Formula 2. The third p-type host 952 and the fourth p-type host 962 may be the same or different.

[0745] One of the third n-type host 954 and the fourth n-type host 964 is represented by Formula 3 and is selected from the compounds of Formula 4. The other of the third n-type host 954 and the fourth n-type host 964 is represented by Formula 5 and is selected from the compounds of Formula 6.

[0746] Each of the third phosphorescent dopant 956 and the fourth phosphorescent dopant 966 is represented by Formula 7 and is independently selected from the compounds of Formula 8. The third phosphorescent dopant 956 and the fourth phosphorescent dopant 966 may be the same or different.

[0747] The thickness of each of the third blue light-emitting layer 950 and the fourth blue light-emitting layer 960 can be from 5 nm to 30 nm, for example, from 10 nm to 20 nm. For example, the thickness of each of the third blue light-emitting layer 950 and the fourth blue light-emitting layer 960 can be 10 nm, 15 nm, or 20 nm.

[0748] The thickness of the third blue light-emitting layer 950 and the thickness of the fourth blue light-emitting layer 960 can be the same or different. In one aspect of the present disclosure, the thickness of the third blue light-emitting layer 950 and the thickness of the fourth blue light-emitting layer 960 can be the same.

[0749] In the third blue light-emitting layer 950, the weight percentages of each of the third p-type host 952 and the third n-type host 954 can be greater than the weight percentage of the third phosphorescent dopant 956, and the weight percentage of the third p-type host 952 and the weight percentage of the third n-type host 954 can be the same or different. For example, the weight percentage of the third p-type host 952 and the weight percentage of the third n-type host 954 can be the same.

[0750] In one aspect of the present disclosure, the third p-type host 952 can be from 25 wt% to 50 wt%, the third n-type host 954 can be from 25 wt% to 50 wt%, and the third phosphorescent dopant 956 can be from 4 wt% to 25 wt%. In one aspect of the present disclosure, the third p-type host 952 can be 44 wt%, the third n-type host 954 can be 44 wt%, and the third phosphorescent dopant 956 can be 12 wt%.

[0751] In the fourth blue light-emitting layer 960, the weight percentages of each of the fourth p-type host 962 and the fourth n-type host 964 can be greater than the weight percentage of the fourth phosphorescent dopant 966, and the weight percentage of the fourth p-type host 962 and the weight percentage of the fourth n-type host 964 can be the same or different. For example, the weight percentage of the fourth p-type host 962 and the weight percentage of the fourth n-type host 964 can be the same.

[0752] In one aspect of the present disclosure, the fourth p-type host 962 can be from 25 wt% to 50 wt%, the fourth n-type host 964 can be from 25 wt% to 50 wt%, and the fourth phosphorescent dopant 966 can be from 4 wt% to 25 wt%. In one aspect of the present disclosure, the fourth p-type host 962 can be 44 wt%, the fourth n-type host 964 can be 44 wt%, and the fourth phosphorescent dopant 966 can be 12 wt%.

[0753] The weight percentages of the third p-type host 952 in the third blue light-emitting layer 950 and the weight percentages of the fourth p-type host 962 in the fourth blue light-emitting layer 960 may be the same or different. The weight percentages of the third n-type host 954 in the third blue light-emitting layer 950 and the weight percentages of the fourth n-type host 964 in the fourth blue light-emitting layer 960 may be the same or different. The weight percentages of the third phosphorescent dopant 956 in the third blue light-emitting layer 950 and the weight percentages of the fourth phosphorescent dopant 966 in the fourth blue light-emitting layer 960 may be the same or different.

[0754] In the present disclosure, the third n-type host 954 included in the third blue light-emitting layer 950 disposed closer to the first electrode 810 as an anode may be represented by Formula 5 and selected from the compounds in Formula 6, and the fourth n-type host 964 included in the fourth blue light-emitting layer 960 disposed closer to the second electrode 830 as a cathode may be represented by Formula 3 and selected from the compounds in Formula 4. In this case, the delayed fluorescence characteristics may be provided by the third blue light-emitting layer 950, and the exciplex characteristics may be provided by the fourth blue light-emitting layer 960. Accordingly, the lifespan of the OLED D5 and the organic light-emitting display device 700 including the same may be significantly increased.

[0755] In Figure 10 the first blue EML 910 and the second blue EML 940 each have a bilayer structure. Alternatively, one of the first blue EML 910 and the second blue EML 940 may have a bilayer structure, and the other of the first blue EML 910 and the second blue EML 940 may have a monolayer structure.

[0756] For example, the blue EML having a monolayer structure may include a blue host and a blue dopant (e.g., an emitter). The blue EML may further include a co-dopant (or a co-host). In the blue EML having a monolayer structure, the weight percentage of the blue dopant may be less than the weight percentages of each of the blue host and the co-dopant.

[0757] In one aspect of the present disclosure, the first blue EML 910 may be a fluorescent light-emitting layer including the compound H-1 in Formula 13 and the compound FD-1 in Formula 14.

[0758] In one aspect of the present disclosure, the first blue EML 910 may be a phosphor-sensitized fluorescence (PSF) light-emitting layer including the compound H-2 in Formula 13, the compound H-3 in Formula 13, the compound FD-2 in Formula 14, and the compound A-1 in Formula 15.

[0759] In one aspect of the present disclosure, the first blue EML 910 may be a hyperfluorescent emitting layer, which includes the compound H-2 in Formula 13, the compound H-3 in Formula 13, the compound FD-2 in Formula 14, and the compound A-2 in Formula 15.

[0760] The first blue EML 910 includes a first blue emitting layer 920 and a second blue emitting layer 930. The first blue emitting layer 920 includes a first p-type host 922, a first n-type host 924, and a first phosphorescent dopant 926. The second blue emitting layer 930 includes a second p-type host 932, a second n-type host 934, and a second phosphorescent dopant 936. The first p-type host 922 and the second p-type host 932 are each a compound represented by Formula 1, and the first phosphorescent dopant 926 and the second phosphorescent dopant 936 are each a compound represented by Formula 7. One of the first n-type host 924 and the second n-type host 934 is a compound represented by Formula 3, and the other of the first n-type host 924 and the second n-type host 934 is a compound represented by Formula 5.

[0761] The second blue EML 940 includes a third blue emitting layer 950 and a fourth blue emitting layer 960. The third blue emitting layer 950 includes a third p-type host 952, a third n-type host 954, and a third phosphorescent dopant 956. The fourth blue emitting layer 960 includes a fourth p-type host 962, a fourth n-type host 964, and a fourth phosphorescent dopant 966. The third p-type host 952 and the fourth p-type host 962 are each a compound represented by Formula 1, and the third phosphorescent dopant 956 and the fourth phosphorescent dopant 966 are each a compound represented by Formula 7. One of the third n-type host 954 and the fourth n-type host 964 is a compound represented by Formula 3, and the other of the third n-type host 954 and the fourth n-type host 964 is a compound represented by Formula 5.

[0762] Therefore, the lifetimes of the OLED D5 and the organic light-emitting display device 700 of the present disclosure are increased.

[0763] It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the disclosure. Accordingly, the disclosure is intended to cover modifications and variations of the disclosure as long as they fall within the scope of the appended claims and their equivalents.

Claims

1. An organic light-emitting diode, comprising: A first electrode; A second electrode facing the first electrode; And A first light-emitting part, the first light-emitting part including a first blue light-emitting material layer and positioned between the first electrode and the second electrode, the first blue light-emitting material layer including a first blue light-emitting layer and a second blue light-emitting layer, Wherein the first blue light-emitting layer contains a first p-type host, a first n-type host, and a first phosphorescent dopant, and the second blue light-emitting layer contains a second p-type host, a second n-type host, and a second phosphorescent dopant, Wherein the first p-type host and the second p-type host are each independently represented by Formula 1: [Formula 1] In Formula 1, a1 and a2 are each independently an integer from 0 to 4, n1 is 0 or 1, When a1 is 2 or greater, two or more R1s are the same or different, and when a2 is 2 or greater, two or more R2s are the same or different, R1 and R2 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl, M1 and M2 are each independently selected from Formula 1-1 and Formula 1-2: [Formula 1-1] and [Formula 1-2] In Formula 1-1, a3 and a4 are each independently an integer from 0 to 4, When a3 is 2 or greater, two or more R3s are the same or different, and when a4 is 2 or greater, two or more R4s are the same or different, R3 and R4 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl, In Formula 1-2, a5, a7, a9, and a10 are each independently an integer from 0 to 4, a6 is an integer from 0 to 3, n2 is 0 or 1, when n2 is 0, a8 is an integer from 0 to 4, and when n2 is 1, a8 is an integer from 0 to 3, When a5 is 2 or greater, two or more R5s are the same or different; when a6 is 2 or greater, two or more R6s are the same or different; when a7 is 2 or greater, two or more R7s are the same or different; when a8 is 2 or greater, two or more R8s are the same or different; when a9 is 2 or greater, two or more R9s are the same or different; when a10 is 2 or greater, two or more Rs 10 are the same or different, and R5, R6, R7, R8, R9 and R 10 each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl and substituted or unsubstituted C6-C30 aryl, wherein the first n-type host is represented by Formula 3: [Formula 3] In Formula 3, b1 is an integer from 0 to 4, b2, b3, and b4 are each independently an integer from 0 to 5, When b1 is 2 or greater, two or more Rs 21 are the same or different, and when b2 is 2 or greater, two or more Rs 22 are the same or different, and when b3 is 2 or greater, two or more Rs 23 are the same or different, and when b4 is 2 or greater, two or more Rs 24 are the same or different, X2, X3, and X4 are each independently selected from N and CR 29 , and at least one of X2, X3, and X4 is N R 21 、R 22 、R 23 and R 24 each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, R 29 selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, Ar1 and Ar2 are each independently selected from a substituted or unsubstituted C6-C30 arylamino group, a substituted or unsubstituted C6-C30 aryl group, and a substituted or unsubstituted C3-C30 heteroaryl group, and X5 is one of C, Si, and Ge, wherein the second n-type host is represented by Formula 5: [Formula 5] In Formula 5, R 31 to R 41 One of them is represented by Formula 5-1, R 31 to R 41 At least one of them is represented by Formula 5-2, R 31 to R 41 each of the remainder is independently selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, or optionally, R 31 to R 41 two adjacent ones of the remainder combine to form a ring [Formula 5-1] and [Formula 5-2] In Formula 5-1, d0 is an integer from 0 to 4, d1, d2, and d3 are each independently an integer from 0 to 5, When d0 is 2 or greater, two or more Rs 50 identical or different, when d1 is 2 or greater, two or more Rs 51 identical or different, when d2 is 2 or greater, two or more Rs 52 identical or different, when d3 is 2 or greater, two or more Rs 53 identical or different, R 50 、R 51 、R 52 and R 53 each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, and X6 is one of C, Si, and Ge, In Formula 5-2, n3 is 0 or 1, d4 and d6 are each independently an integer from 0 to 4, d5 is an integer from 0 to 2, When d4 is 2 or greater, two or more Rs 54 are the same or different, and when d5 is 2, two Rs 55 are the same or different, and when d6 is 2 or greater, two or more Rs 56 are the same or different R 54 、R 55 and R 56 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl. One of X7 and X8 is a single bond, and the other of X7 and X8 is selected from NR 57 , CR 58 R 59 , O and S, and R 57 、R 58 and R 59 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl.

2. The organic light emitting diode according to claim 1, wherein the first p-type host and the second p-type host are each independently selected from the compounds of Formula 2 below: [Formula 2] 3. The organic light emitting diode according to claim 1, wherein Formula 3 is represented by Formula 3a: [Formula 3a] In Formula 3a, b1 to b4, R 21 to R 24 and the definitions of X2 to X5 are the same as those in Formula 3 b5, b6, b7, and b8 are each independently an integer from 0 to 4, When b5 is 2 or greater, two or more Rs 25 identical or different, when b6 is 2 or greater, two or more Rs 26 identical or different, when b7 is 2 or greater, two or more Rs 27 identical or different, when b8 is 2 or greater, two or more Rs 28 identical or different, and R 25 、 R 26 、 R 27 and R 28 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, or optionally, R 25 、 R 26 、 R 27 and R 28 adjacent to each other in form a ring.

4. The organic light emitting diode according to claim 1, wherein the first n-type host is selected from the compounds of Formula 4 below: [Formula 4] 5. The organic light emitting diode according to claim 1, wherein the second n-type host is selected from the compounds of Formula 6 below: [Formula 6] 6. The organic light emitting diode according to claim 6, wherein the first phosphorescent dopant and the second phosphorescent dopant are each independently represented by Formula 7: [Formula 7] In Formula 7, e1, e2, and e3 are each independently an integer from 0 to 4, e4 is an integer from 0 to 3, e5 is an integer from 0 to 2, When e1 is 2 or greater, two or more Rs 61 are the same or different. When e2 is 2 or greater, two or more Rs 62 are the same or different. When e3 is 2 or greater, two or more Rs 63 are the same or different. When e4 is 2 or greater, two or more Rs 64 are the same or different. When e5 is 2, two Rs 65 are the same or different, R 61 to R 65 each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, and R 66 selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl.

7. The organic light emitting diode according to claim 6, wherein the first phosphorescent dopant and the second phosphorescent dopant are each independently selected from the compounds of Formula 8 below: [Formula 8] 8. An organic light emitting diode, comprising: a first electrode; a second electrode facing the first electrode; and a first light emitting part, the first light emitting part including a first blue light emitting material layer and positioned between the first electrode and the second electrode, the first blue light emitting material layer including a first blue light emitting layer and a second blue light emitting layer, wherein the first blue light emitting layer contains a first p-type host, a first n-type host, and a first phosphorescent dopant, and the second blue light emitting layer contains a second p-type host, a second n-type host, and a second phosphorescent dopant, wherein the first p-type host and the second p-type host are each independently represented by Formula 2: [Formula 2] wherein the first n-type host is represented by Formula 3a: [Formula 3a] In Formula 3a, b1 is an integer from 0 to 4, and b2, b3, and b4 are each independently an integer from 0 to 5. When b1 is 2 or greater, two or more Rs 21 identical or different; when b2 is 2 or greater, two or more Rs 22 identical or different; when b3 is 2 or greater, two or more Rs 23 identical or different; when b4 is 2 or greater, two or more Rs 24 identical or different, X2, X3, and X4 are each independently selected from N and CR 29 , and at least one of X2, X3, and X4 is N R 21 、R 22 、R 23 and R 24 each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, R 29 selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, X5 is one of C, Si, and Ge. b5, b6, b7, and b8 are each independently an integer from 0 to 4. When b5 is 2 or greater, two or more Rs 25 identical or different, when b6 is 2 or greater, two or more Rs 26 identical or different, when b7 is 2 or greater, two or more Rs 27 identical or different, when b8 is 2 or greater, two or more Rs 28 identical or different, and R 25 、R 26 、R 27 and R 28 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, or optionally, R 25 、R 26 、R 27 and R 28 adjacent to each other in are combined to form a ring, wherein the second n-type host is represented by Formula 6: [Formula 6] 9. The organic light-emitting diode according to claim 1 or 8, wherein the first electrode is an anode, the second electrode is a cathode, and the second blue light-emitting layer is positioned between the first electrode and the first blue light-emitting layer.

10. The organic light-emitting diode according to claim 1 or 8, wherein the thickness of the first blue light-emitting layer is the same as the thickness of the second blue light-emitting layer.

11. The organic light-emitting diode according to claim 1 or 8, further comprising: a second light-emitting portion, the second light-emitting portion including a second blue light-emitting material layer and being positioned between the first light-emitting portion and the second electrode.

12. The organic light-emitting diode according to claim 11, wherein the second blue light-emitting material layer includes a third blue light-emitting layer and a fourth blue light-emitting layer. wherein the third blue light-emitting layer contains a third p-type host, a third n-type host, and a third phosphorescent dopant, and the fourth blue light-emitting layer contains a fourth p-type host, a fourth n-type host, and a fourth phosphorescent dopant. wherein the third p-type host and the fourth p-type host are each independently represented by Formula 1. [Formula 1] In Formula 1, a1 and a2 are each independently an integer from 0 to 4, and n1 is 0 or 1. When a1 is 2 or greater, two or more R1s are the same or different, and when a2 is 2 or greater, two or more R2s are the same or different. R1 and R2 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl. M1 and M2 are each independently selected from Formula 1-1 and Formula 1-2: [Formula 1-1] and [Formula 1-2] In Formula 1-1, a3 and a4 are each independently an integer from 0 to 4. When a3 is 2 or greater, two or more R3s are the same or different, and when a4 is 2 or greater, two or more R4s are the same or different. R3 and R4 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl, and substituted or unsubstituted C6-C30 aryl, In the formula 1-2, a5, a7, a9 and a10 are each independently an integer from 0 to 4, a6 is an integer from 0 to 3, and n2 is 0 or 1, when n2 is 0, a8 is an integer from 0 to 4, and when n2 is 1, a8 is an integer from 0 to 3, When a5 is 2 or greater, two or more R5s are the same or different; when a6 is 2 or greater, two or more R6s are the same or different; when a7 is 2 or greater, two or more R7s are the same or different; when a8 is 2 or greater, two or more R8s are the same or different; when a9 is 2 or greater, two or more R9s are the same or different; when a10 is 2 or greater, two or more Rs 10 are the same or different, and R5, R6, R7, R8, R9 and R 10 each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylgermyl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylgermyl and substituted or unsubstituted C6-C30 aryl, and wherein the third n-type host is represented by formula 3, and the fourth n-type host is represented by formula 5, [Formula 3] In the formula 3, b1 is an integer from 0 to 4, and b2, b3 and b4 are each independently an integer from 0 to 5, When b1 is 2 or greater, two or more Rs 21 which are the same or different, when b2 is 2 or greater, two or more Rs 22 which are the same or different, when b3 is 2 or greater, two or more Rs 23 which are the same or different, when b4 is 2 or greater, two or more Rs 24 which are the same or different, X2, X3, and X4 are each independently selected from N and CR 29 , and at least one of X2, X3, and X4 is N R 21 、R 22 、R 23 and R 24 each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, R 29 selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, Ar1 and Ar2 are each independently selected from substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl, and X5 is one of C, Si and Ge, [Formula 5] In the formula 5, R 31 to R 41 One of them is represented by Formula 5-1, R 31 to R 41 At least one of them is represented by Formula 5-2, R 31 to R 41 and the remainder of each independently selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, or optionally, R 31 to R 41 and two adjacent ones of the remainder combine to form a ring [Formula 5-1] and [Formula 5-2] In the formula 5-1, d0 is an integer from 0 to 4, d1, d2 and d3 are each independently an integer from 0 to 5, When d0 is 2 or greater, two or more Rs 50 may be the same or different. When d1 is 2 or greater, two or more Rs 51 are the same or different. When d2 is 2 or greater, two or more Rs 52 are the same or different. When d3 is 2 or greater, two or more Rs 53 are the same or different, R 50 、R 51 、R 52 and R 53 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, and X6 is one of C, Si and Ge, In the formula 5-2, n3 is 0 or 1, d4 and d6 are each independently an integer from 0 to 4, and d5 is an integer from 0 to 2, When d4 is 2 or greater, two or more Rs 54 identical or different, when d5 is 2, two Rs 55 identical or different, when d6 is 2 or greater, two or more Rs 56 identical or different, R 54 、R 55 and R 56 are each independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl. One of X7 and X8 is a single bond, and the other of X7 and X8 is selected from NR 57 , CR 58 R 59 , O and S, and R 57 , R 58 and R 59 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heteroaryl.

13. The organic light emitting diode according to claim 12, wherein the formula 3 is represented by formula 3a: [Formula 3a] In the formula 3a, b1 to b4, R 21 to R 24 and the definitions of X2 to X5 are the same as those in Formula 3, b5, b6, b7 and b8 are each independently an integer from 0 to 4, When b5 is 2 or greater, two or more Rs 25 identical or different, when b6 is 2 or greater, two or more Rs 26 identical or different, when b7 is 2 or greater, two or more Rs 27 identical or different, when b8 is 2 or greater, two or more Rs 28 identical or different, and R 25 , R 26 , R 27 and R 28 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1 to C20 alkyl, substituted or unsubstituted C1 to C20 alkoxy, substituted or unsubstituted C3 to C30 cycloalkyl, substituted or unsubstituted C1 to C20 alkylamino, substituted or unsubstituted C6 to C30 aryloxy, substituted or unsubstituted C2 to C20 alkenyl, substituted or unsubstituted C2 to C20 alkynyl, substituted or unsubstituted C6 to C30 arylamino, substituted or unsubstituted C6 to C30 aryl, and substituted or unsubstituted C3 to C30 heteroaryl, or optionally, R 25 , R 26 , R 27 and R 28 Two adjacent pairs are combined to form a ring.

14. The organic light emitting diode according to claim 12, wherein the third phosphorescent dopant and the fourth phosphorescent dopant are each independently represented by formula 7: [Formula 7] In the formula 7, e1, e2 and e3 are each independently an integer from 0 to 4, e4 is an integer from 0 to 3, and e5 is an integer from 0 to 2, When e1 is 2 or greater, two or more Rs 61 identical or different, when e2 is 2 or greater, two or more Rs 62 identical or different, when e3 is 2 or greater, two or more Rs 63 identical or different, when e4 is 2 or greater, two or more Rs 64 identical or different, when e5 is 2, two Rs 65 identical or different, R 61 to R 65 each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl, and R 66 selected from hydrogen, deuterium, halogen, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl.

15. The organic light emitting diode according to claim 12, wherein the first electrode is an anode, the second electrode is a cathode, and the fourth blue light emitting layer is positioned between the first electrode and the third blue light emitting layer.

16. The organic light emitting diode according to claim 12, wherein the thickness of the third blue light emitting layer is the same as the thickness of the fourth blue light emitting layer.

17. The organic light emitting diode according to claim 11, further comprising: A third light-emitting part, the third light-emitting part including a red light-emitting material layer and a green light-emitting material layer and being positioned between the first light-emitting part and the second light-emitting part.

18. The organic light-emitting diode according to claim 17, wherein the third light-emitting part further includes a yellow-green light-emitting material layer between the red light-emitting material layer and the green light-emitting material layer.

19. The organic light-emitting diode according to claim 1 or 8, wherein the difference between the lowest unoccupied molecular orbital (LUMO) energy level of the first p-type host and the LUMO energy level of the first n-type host is greater than 0.3 eV, and the difference between the highest occupied molecular orbital (HOMO) energy level of the first p-type host and the HOMO energy level of the first n-type host is greater than 0.3 eV.

20. The organic light-emitting diode according to claim 1 or 8, wherein the difference between the singlet energy level and the triplet energy level of the second n-type host is less than 0.3 eV, and wherein the lowest unoccupied molecular orbital (LUMO) energy level of the second n-type host is less than the LUMO energy level of the second p-type host and is equal to or greater than the LUMO energy level of the second phosphorescent dopant.

Images