Functional layer material, light-emitting device and display panel

Abstract

The embodiment of the invention provides a functional layer material, a light-emitting device and a display panel, relates to the technical field of display, and is used for prolonging the service life of the device, improving the light-emitting efficiency and reducing the voltage of the light-emitting device. The material of the functional layer is selected from any one of structures shown in a general formula (I). Wherein IA represents a first substituted unit and comprises at least one fused ring aryl group; x is selected from any one of O, S and Se; y is selected from any one of O, S, N (R4), C (R5R6) and a single bond; l1 is selected from any one of a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 1 to 30 carbon atoms, a substituted or unsubstituted arylene group having 7 to 30 carbon atoms, and a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms; and L2 is selected from any one of a substituted or unsubstituted arylene group of C6 to C30, a substituted or unsubstituted heteroarylene group of C1 to C30, a substituted or unsubstituted arylene group of C7 to C30, and a substituted or unsubstituted heteroarylene group of C2 to C30. The functional layer material is used for a functional layer in a light-emitting device.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a functional layer material, a light-emitting device and a display panel. Background Art

[0002] Organic light emitting diode (OLED) light emitting devices have become the most promising new light emitting devices in recent years due to their advantages such as self-luminescence and fast response speed. In the light emitting process of the OLED light emitting device, holes from the anode and electrons from the cathode are emitted to the light emitting layer included in the OLED light emitting device, and these electrons and holes are combined to form electron-hole pairs, and the formed electron-hole pairs are converted from the singlet state to the ground state to emit light. Summary of the invention

[0003] The purpose of the embodiments of the present disclosure is to provide a functional layer material, a light-emitting device and a display panel, which are used to improve the device life and light-emitting efficiency and reduce the voltage of the light-emitting device.

[0004] To achieve the above objectives, the embodiments of the present disclosure provide the following technical solutions:

[0005] On the one hand, a functional layer material is provided, which is selected from any one of the structures shown in the following general formula (I).

[0006]

[0007] Wherein, IA represents the first substitution unit, including at least one fused ring aromatic group; X is selected from any one of O, S and Se; Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond, and X and Y are the same or different; L1 is selected from a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group and a substituted or unsubstituted C2 ~C30 heteroarylalkylene; L2 is selected from any one of substituted or unsubstituted C6~C30 arylene, substituted or unsubstituted C1~C30 heteroarylene, substituted or unsubstituted C7~C30 arylalkylene and substituted or unsubstituted C2~C30 heteroarylalkylene; and L2 and L1 are the same or different; R1, R2, R4, R5 and R6 are the same or different and are independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, substituted or unsubstituted C6-C39 arylamine, substituted or unsubstituted C3-C39 cycloalkyl , substituted or unsubstituted C3~C39 heterocycloalkyl, substituted or unsubstituted C1~C39 alkylsilyl, substituted or unsubstituted C1~C39 alkylboryl, substituted or unsubstituted C6~C39 arylboryl, substituted or unsubstituted C6~C39 arylphosphino, substituted or unsubstituted C6~C39 arylsilyl; the value of n is a positive integer greater than or equal to 1; the value of q is a positive integer greater than or equal to 1.

[0008] As can be seen from the structure shown in the general formula (I), the functional layer material is a triarylamine material, so that the functional layer material is a hole-type material, which can be used to transport holes and / or block electrons. In this way, the functional layer material can be used to form a first type of functional layer with a hole transport function of a light-emitting device, such as an electron blocking functional layer, a hole transport functional layer, for transporting holes to the light-emitting layer. Moreover, the three substitution units of the triarylamine material are the first substitution unit, the second substitution unit and the third substitution unit. Among them, the heteroatom X or Y in the second substitution unit can improve the hole transport ability of the functional layer material, increase the amount of holes transmitted to the light-emitting layer, and can improve the recombination probability of holes and electrons in the light-emitting layer, improve the emission efficiency, and at the same time, because the second substitution unit has a higher triplet energy level, the functional layer material can have a relatively high triplet energy level, which can block the excitons in the light-emitting layer from being transmitted in the direction close to the first type of functional layer, so that more excitons can stay in the light-emitting layer, so that the luminous efficiency of the light-emitting device can be effectively improved. The third substitution unit contains a carbazole group, which can make the functional layer material have a suitable highest occupied molecular orbital energy level, reduce the energy gap that holes need to overcome when transmitting from the first type of functional layer to the light-emitting layer, so that the voltage driving the light-emitting device to emit light can be effectively reduced, so that the power consumption of the light-emitting device can be reduced. Furthermore, since the first substitution unit IA is a condensed ring aromatic group with relatively good conjugation, the light-emitting device can have a relatively higher luminous efficiency, a relatively lower voltage, and a longer service life under the cooperation of the second substitution unit and the third substitution unit.

[0009] In some embodiments, the functional layer material is selected from any one of the structures shown in the following general formula (II).

[0010]

[0011] wherein L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L3 and L1 are the same or different, and L3 and L2 are the same or different; and R3 is selected from hydrogen, deuterium, a substituted or unsubstituted C1-C39 alkyl group, a substituted or unsubstituted C2-C39 alkenyl group, a substituted or unsubstituted C2-C39 alkynyl group, a substituted or unsubstituted C6-C39 aryl group, a substituted or unsubstituted C5-C60 heteroaryl group, The invention relates to a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C1-C39 alkoxy group, a substituted or unsubstituted C6-C39 arylamine group, a substituted or unsubstituted C3-C39 cycloalkyl group, a substituted or unsubstituted C3-C39 heterocycloalkyl group, a substituted or unsubstituted C1-C39 alkylsilyl group, a substituted or unsubstituted C1-C39 alkylboryl group, a substituted or unsubstituted C6-C39 arylboryl group, a substituted or unsubstituted C6-C39 arylphosphine group, or a substituted or unsubstituted C6-C39 arylsilyl group; the value of m is a positive integer greater than or equal to 1.

[0012] In other embodiments, X is oxygen and Y is a single bond; or, X is sulfur and Y is a single bond.

[0013] In yet other embodiments, X is oxygen and Y is oxygen; or, X is oxygen and Y is sulfur.

[0014] In some other embodiments, the functional layer material is selected from any one of the structures shown in the following general formula (III).

[0015]

[0016] In some other embodiments, the functional layer material is selected from any one of the structures shown in the following general formula (IV).

[0017]

[0018] In some other embodiments, when the functional layer material is selected from any one of the structures shown in general formula (I), the structure shown in general formula (I) contains at least one deuterium; or, when the functional layer material is selected from any one of the structures shown in general formula (II), the structure shown in general formula (II) contains at least one deuterium; or, when the functional layer material is selected from any one of the structures shown in general formula (III), the structure shown in general formula (III) contains at least one deuterium; or, when the functional layer material is selected from any one of the structures shown in general formula (IV), the structure shown in general formula (IV) contains at least one deuterium.

[0019] In some other embodiments, when m is greater than 2, two adjacent R3 groups can be bonded to form a ring.

[0020] In some other embodiments, when q is greater than 2, two adjacent R1s can be bonded to form a ring.

[0021] In some other embodiments, when n is greater than 2, two adjacent R2 can be bonded to form a ring.

[0022] In yet other embodiments, the functional layer material is used to transport holes and / or block electrons.

[0023] On the other hand, a light-emitting device is provided, comprising a cathode and an anode arranged opposite to each other, and at least one light-emitting unit arranged between the cathode and the anode; the light-emitting unit comprises: a light-emitting layer and a first type of functional layer arranged on the side of the light-emitting layer close to the anode; the material of the first type of functional layer comprises the functional layer material described in any of the above embodiments.

[0024] The beneficial effects that can be achieved by the light-emitting devices provided by some embodiments of the present disclosure are the same as the beneficial effects that can be achieved by a functional layer material provided by the above technical solution, and will not be repeated here.

[0025] In some embodiments, the first type of functional layer includes a plurality of sub-functional layers, and at least one sub-functional layer of the plurality of sub-functional layers includes a functional layer material.

[0026] In other embodiments, the multiple sub-functional layers include an electron blocking functional layer, a hole injection functional layer and a hole transport functional layer that are stacked; the hole injection functional layer, the hole transport functional layer and the electron blocking functional layer are arranged in sequence along a direction away from the anode; among the hole injection functional layer, the hole transport functional layer and the electron blocking functional layer, at least the electron blocking functional layer includes a functional layer material.

[0027] In some other embodiments, the light-emitting layer is configured to emit blue light; the material of the light-emitting layer includes: a host material and a guest material; the structural formula of the host material is shown below.

[0028]

[0029] The structural formula of the guest material is shown below.

[0030]

[0031] On the other hand, a display panel is provided, comprising a plurality of light-emitting devices as described in any of the above embodiments; and further comprising: a pixel driving circuit electrically connected to the light-emitting devices, the pixel driving circuit being used to drive the light-emitting devices to emit light.

[0032] The beneficial effects that can be achieved by the display panel provided by some embodiments of the present disclosure are the same as the beneficial effects that can be achieved by a light-emitting device provided by the above technical solution, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0034] Figure 1 A structural diagram of a light emitting device provided according to some embodiments of the present disclosure;

[0035] Figure 2 A structural diagram of a display panel provided according to some embodiments of the present disclosure;

[0036] Figure 3 Another structural diagram of a display panel provided according to some embodiments of the present disclosure;

[0037] Figure 4 It is a structural diagram of a display device provided according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0039] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0040] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0041] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0042] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0043] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0044] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0045] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0046] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0047] It should be noted that, in the drawings of the present application, for example, 1 / 2 indicates that structure 1 and structure 2 can refer to the structures shown in the drawings. Figure 1 The reference numerals 13211 / 1321 indicate that the hole injection functional layer 13211 and the sub-functional layer 1321 may refer to the structure shown, and other similar reference numerals appearing in the drawings also follow the above description.

[0048] As mentioned in the background, in the field of organic semiconductors, OLED technology has attracted more and more attention from academia and industry, and has been successfully applied in the commercial flat panel display and lighting industries. OLED light-emitting devices have the characteristics of self-luminescence. Accordingly, OLED display panels and OLED light-emitting substrates have the advantages of not requiring a backlight source, thin panels, and light weight. At the same time, OLED light-emitting devices also have the advantages of being all solid-state, fast response time, and a wide operating temperature range.

[0049] Among them, the different compositions of the compounds used in the organic material layers of OLED light-emitting devices will have a significant difference in the overall performance of the organic light-emitting devices. With the development of OLED light-emitting devices, the requirements for the efficiency, power consumption, service life and other performance of OLED light-emitting devices are getting higher and higher, and the existing organic materials can hardly meet the requirements of OLED light-emitting devices.

[0050] Based on this, some embodiments of the present disclosure provide a functional layer material F, selected from any one of the structures shown in the following general formula (I).

[0051]

[0052] Wherein, IA represents the first substitution unit, comprising at least one fused-ring aromatic group.

[0053] X is selected from any one of O, S and Se.

[0054] Y is selected from any one of O, S, N(R4), C(R5 R6) and a single bond, and X and Y are the same or different.

[0055] L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group and a substituted or unsubstituted C2-C30 heteroaralkylene group.

[0056] L2 is selected from any one of a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L2 and L1 are the same or different.

[0057] R1, R2, R4, R5 and R6 are the same or different and are independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, a substituted or unsubstituted C6-C39 aromatic amino group, a substituted or unsubstituted C3-C39 cycloalkyl group, a substituted or unsubstituted C3-C39 heterocycloalkyl group, a substituted or unsubstituted C1-C39 alkylsilyl group, a substituted or unsubstituted C1-C39 alkylboryl group, a substituted or unsubstituted C6-C39 arylboryl group, a substituted or unsubstituted C6-C39 aromatic phosphino group, or a substituted or unsubstituted C6-C39 aromatic silyl group.

[0058] The value of n is a positive integer greater than or equal to 1.

[0059] The value of q is a positive integer greater than or equal to 1.

[0060] Exemplarily, the value of n can be any one of 1, 2, 3, 4, 5, 6, 7 and 8.

[0061] Exemplarily, the value of q can be any one of 1, 2, 3, 4, 5, 6 and 7.

[0062] Regarding the structure shown in general formula (I), the following points need to be explained:

[0063] The first substitution unit shown in IA includes at least one fused ring aromatic group, which can be a naphthyl group, a phenanthryl group, etc. That is, the number of aromatic rings fused together in the fused ring aromatic group can be 2, 3, or a positive integer greater than 3.

[0064] X is selected from any one of O, S and Se, wherein O is oxygen, S is sulfur, and Se is selenium.

[0065] Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond. Wherein, O is oxygen; S is sulfur; N(R4) is nitrogen substituted by R4; C(R5R6) is carbon substituted by R5 and R6, and R5 and R6 may be the same or different. When Y is selected from a single bond, carbon 11 and carbon 12 of the IB part are directly connected by a covalent bond.

[0066] L1 can be selected from a single bond, and when L1 is a single bond, the nitrogen and carbon number 1 of the IB moiety are directly connected by a covalent bond.

[0067] L1 and L2 can be selected from any one of substituted or unsubstituted C6-C30 arylene groups, substituted or unsubstituted C1-C30 heteroarylene groups, substituted or unsubstituted C7-C30 aralkylene groups and substituted or unsubstituted C2-C30 heteroaralkylene groups. Among them, the aryl group of Cx refers to an aryl group having a total of x carbon (C) atoms, x is a positive integer, and the same applies below. For the understanding of other groups such as Cx heteroaryl groups and Cx aralkylene groups, please refer to the above content and will not be repeated here. In addition, phenyl refers to the general term for the group remaining after the hydrogen atom of one carbon atom on the benzene ring is removed. Phenylene refers to the general term for the group remaining after the hydrogen atoms on two carbon atoms on the benzene ring are removed. For the understanding of other groups such as arylene groups, heteroarylene groups, alkylene groups, etc., please refer to the above content and will not be repeated here.

[0068] It should be noted that the aryl group may be a phenyl group. The heteroaryl group may be a furanyl group, a pyranyl group, a thienyl group, a pyridyl group, etc. The C1 heteroaryl group refers to a group containing an aromatic ring, and the aromatic ring contains a carbon atom. The arylalkylene group refers to an alkylene group substituted with an aryl group, and the C7 arylalkylene group refers to an alkylene group substituted with a phenyl group. The heteroarylalkylene group refers to an alkylene group substituted with a heteroaryl group, and the C2 heteroarylalkylene group refers to an alkylene group substituted with a C1 heteroaryl group.

[0069] For example, when L1 and L2 are aralkylene groups, the position where nitrogen is connected to the aralkylene group can be the alkylene portion of the aralkylene group; the nitrogen described here is the nitrogen connected to the IB portion, the IC portion, and the first substituent unit IA.

[0070] For example, when L1 and L2 are heteroarylalkylene groups, the position where nitrogen is connected to the heteroarylalkylene group can be the alkylene portion of the heteroarylalkylene group; the nitrogen described here is the nitrogen connected to the IB portion, the IC portion, and the first substituent unit IA.

[0071] When L1 and L2 are selected from substituted C6-C30 arylene groups, substituted C1-C30 heteroarylene groups, substituted C7-C30 aralkylene groups and substituted C2-C30 heteroaralkylene groups, the types of substituents are not limited herein.

[0072] When R1, R2, R4, R5 and R6 are selected from substituted C1-C39 alkyl, substituted C2-C39 alkenyl, substituted C2-C39 alkynyl, substituted C6-C39 aryl, substituted C5-C60 heteroaryl, substituted C6-C60 aryloxy, substituted C1-C39 alkoxy, substituted C6-C39 arylamine, substituted C3-C39 cycloalkyl, substituted C3-C39 heterocycloalkyl, substituted C1-C39 alkylsilyl, substituted C1-C39 alkylboryl, substituted C6-C39 arylboryl, substituted C6-C39 arylphosphino, substituted C6-C39 arylsilyl, the type of substituent is not limited herein.

[0073] In the general formula (I), L1 is connected to carbon No. 1 of the IB part. Regarding the connection position of R1 and the IB part shown in the general formula (I), it means that R1 can be connected to any one of carbon No. 2, 3, 6, 7, 8, 9, and 12 of the IB part, that is, R1 can be connected to any carbon having a substitution position among carbon No. 2, 3, 6, 7, 8, 9, and 12.

[0074] When the value of q is greater than or equal to 2, that is, when the number of R1 is greater than or equal to 2, the types of the q R1 may be the same or different.

[0075] Regarding the connection position of R2 and the IC part shown in the general formula (I), it means that R2 can be connected to any one of the carbons 1', 2', 3', 4', 5', 6', 7', and 8' of the IC part, that is, R2 can be connected to any one of the carbons 1', 2', 3', 4', 5', 6', 7', and 8' that has a substitution position.

[0076] When the value of n is greater than or equal to 2, that is, when the number of R2 is greater than or equal to 2, the types of the n R2 may be the same or different.

[0077] From the structure shown in general formula (I), it can be seen that the functional layer material F is a triarylamine material, and by connecting N to the IA part, the IB part, and the IC part respectively, the functional layer material F is a hole-type material, which can be used to transport holes and / or block electrons. For example, Figure 1 As shown in the structural diagram of the light-emitting device 100, the functional layer material F is used to form a first type functional layer 132 with a hole transport function, such as an electron blocking functional layer 13213 and a hole transport functional layer 13212, which is used to transport holes to the light-emitting layer 131 (for an introduction to the structure of the light-emitting device 100, see the following content, which will not be repeated here).

[0078] Moreover, the three substitution units of the triarylamine material are the first substitution unit IA, the second substitution unit IB and the third substitution unit IC. Among them, the heteroatom X or Y in the second substitution unit IB can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and improve the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the second substitution unit IB has a higher triplet energy level T1, the functional layer material F can have a relatively high triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transported in the direction close to the first type of functional layer 132, so that more excitons can stay in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved. The third substitution unit IC contains a carbazole group, that is, The functional layer material F can have a suitable highest occupied molecular orbital energy level (HOMO), reducing the energy gap (GAP) that needs to be overcome when holes are transmitted from the first type functional layer 132 to the light-emitting layer 131. In this way, the voltage for driving the light-emitting device 100 to emit light can be effectively reduced, so that the power consumption of the light-emitting device 100 can be reduced. Furthermore, since the first substitution unit IA is a condensed ring aromatic group with relatively good conjugation, the light-emitting device 100 can have a relatively higher luminous efficiency, a relatively lower voltage, and a longer service life under the cooperation of the second substitution unit IB and the third substitution unit IC.

[0079] In some embodiments, the functional layer material F is selected from any one of the structures shown in the following general formula (II).

[0080]

[0081] Wherein, L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L3 and L1 are the same or different, and L3 and L2 are the same or different.

[0082] R3 is selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, substituted or unsubstituted C6-C39 arylamine, substituted or unsubstituted C3-C39 cycloalkyl, substituted or unsubstituted C3-C39 heterocycloalkyl, substituted or unsubstituted C1-C39 alkylsilyl, substituted or unsubstituted C1-C39 alkylboryl, substituted or unsubstituted C6-C39 arylboryl, substituted or unsubstituted C6-C39 arylphosphino, substituted or unsubstituted C6-C39 arylsilyl.

[0083] The value of m is a positive integer greater than or equal to 1.

[0084] Exemplarily, the value of m can be any one of 1, 2, 3, 4, 5, 6, 7, 8 and 9.

[0085] It is understood that IA-1 in the general formula (II) is a phenanthryl group.

[0086] It should be noted that the above L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group. When L3 is a single bond, the nitrogen and one of the carbon atoms on the phenanthryl group are directly connected by a covalent bond. The description of substituted or unsubstituted C6-C30 arylene groups, substituted or unsubstituted C1-C30 heteroarylene groups, substituted or unsubstituted C7-C30 aralkylene groups and substituted or unsubstituted C2-C30 heteroaralkylene groups can be found in the description of substituted or unsubstituted C6-C30 arylene groups, substituted or unsubstituted C1-C30 heteroarylene groups, substituted or unsubstituted C7-C30 aralkylene groups and substituted or unsubstituted C2-C30 heteroaralkylene groups in the above general formula (I), which will not be repeated here.

[0087] It should be noted that when R3 is selected from substituted C1-C39 alkyl, substituted C2-C39 alkenyl, substituted C2-C39 alkynyl, substituted C6-C39 aryl, substituted C5-C60 heteroaryl, substituted C6-C60 aryloxy, substituted C1-C39 alkoxy, substituted C6-C39 arylamine, substituted C3-C39 cycloalkyl, substituted C3-C39 heterocycloalkyl, substituted C1-C39 alkylsilyl, substituted C1-C39 alkylboryl, substituted C6-C39 arylboryl, substituted C6-C39 arylphosphino, substituted C6-C39 arylsilyl, the type of substituent is not limited here.

[0088] Regarding the connection position of L3 and the phenanthryl group shown in the general formula (II), it means that L3 can be connected to the 1", 2",

[0089] 3", 4", 5", 6", 7", 8", 9", 10", any one of the carbons, i.e. L3 can be connected with 1", 2", 3",

[0090] Any of carbons 4", 5", 6", 7", 8", 9", and 10" has a substituted carbon.

[0091] The connection position of R3 and the phenanthryl group shown in the general formula (II) means that R3 can be connected to 1", 2",

[0092] 3", 4", 5", 6", 7", 8", 9", 10", that is, R3 can be connected to any carbon having a substitution position among 1", 2", 3", 4", 5", 6", 7", 8", 9", 10", carbon.

[0093] When m is greater than or equal to 2, that is, the number of R2 is greater than or equal to 2, the types of the m R3 may be the same or different.

[0094] It is understood that when the condensed ring aromatic group in the first substituent group IA in the structure shown in the general formula (I) contains a phenanthryl group, the structure shown in the general formula (I) can be transformed into the structure shown in the general formula (II). It should be noted that the condensed ring aromatic group contained in the general formula (I) herein means that the condensed ring aromatic group is a phenanthryl group, or the condensed ring aromatic group is another condensed ring aromatic group formed by further condensing on the phenanthryl group.

[0095] Based on the structure shown in the general formula (II), the condensed ring aromatic group in the first substitution unit IA of the functional layer material F contains a phenanthryl group, which is a structure formed by three six-membered carbon rings fused together, has a large conjugated area, and can produce a better conjugated effect. In this way, under the cooperation of the second substitution unit IB and the third substitution unit IC, the luminous efficiency of the light-emitting device 100 can be relatively higher, the voltage can be relatively lower, and the service life can be extended.

[0096] In some embodiments, X is oxygen and Y is a single bond. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (V).

[0097]

[0098] When X is oxygen and Y is a single bond, the IB part in the general formula (I) is transformed into the IB-1 part in the general formula (V). The IB-1 part in the general formula (V) contains a dibenzofuran structure. The heteroatom oxygen in the dibenzofuran structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and increase the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the dibenzofuran structure has a higher triplet energy level T1, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0099] An exemplary structure of the functional layer material F in the structure represented by the general formula (V) is described below.

[0100] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0101]

[0102] In some examples, when L1 is a single bond, L2 is a biphenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0103]

[0104]

[0105] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0106]

[0107]

[0108] In some examples, when L1 is a phenylene group, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0109]

[0110]

[0111] In some examples, when L1 is a phenylene group, L2 is a naphthylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0112]

[0113] In some examples, when L1 is a phenylene group, L2 is a biphenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0114]

[0115] In some examples, when L1 is a phenylene group, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F may be as shown below.

[0116]

[0117] It should be noted that the above listed structural formulas are examples of the structure of the functional layer material F, and are not limitations on the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not a part of the structural formula structure, wherein x is a positive integer.

[0118] In some embodiments, X is sulfur and Y is a single bond. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (VI).

[0119]

[0120] When X is sulfur and Y is a single bond, the IB part in the general formula (I) is transformed into the IB-2 part in the general formula (VI). The IB-2 part in the general formula (VI) contains a dibenzothiophene structure. The heteroatom sulfur in the dibenzothiophene structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and increase the probability of recombination of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the dibenzothiophene structure has a higher triplet energy level T1, the functional layer material F can have a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0121] An exemplary structure of the functional layer material F in the structure represented by the general formula (VI) is described below.

[0122] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0123]

[0124]

[0125] In some examples, when L1 is a single bond, L2 is a biphenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0126]

[0127]

[0128] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0129]

[0130]

[0131] In some examples, when L1 is a single bond, L2 is a biphenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0132]

[0133] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a biphenylene group, the structural formula of the functional layer material F can be as shown below.

[0134]

[0135] In some examples, when L1 is a phenylene group, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0136]

[0137] It should be noted that the above listed structural formulas are examples of the structure of the functional layer material F, and are not limitations on the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not a part of the structural formula structure, wherein x is a positive integer.

[0138] In some embodiments, X is oxygen, and Y is oxygen. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (VII).

[0139]

[0140] When X is oxygen and Y is oxygen, the IB part in the general formula (I) is transformed into the IB-3 part in the general formula (VII). The IB-3 part in the general formula (VII) contains a dibenzo-p-dioxin structure. The heteroatom oxygen in the dibenzo-p-dioxin structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and increase the probability of recombination of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the dibenzo-p-dioxin structure has a higher triplet energy level T1, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transported in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0141] An exemplary structure of the functional layer material F in the structure represented by the general formula (VII) is described below.

[0142] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0143]

[0144] It should be noted that the above listed structural formulas are examples of the structure of the functional layer material F, and are not limitations on the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not a part of the structural formula structure, wherein x is a positive integer.

[0145] In some embodiments, X is oxygen and Y is sulfur. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (VIII).

[0146]

[0147] When X is oxygen and Y is sulfur, the IB part in the general formula (I) is transformed into the IB-4 part in the general formula (VIII). The IB-4 part in the general formula (VIII) contains a dibenzothiophene structure (i.e., a thiophene structure). The heteroatoms oxygen and sulfur in the dibenzothiophene structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and increase the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the dibenzothiophene structure has a higher triplet energy level T1, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0148] An exemplary structure of the functional layer material F in the structure represented by the general formula (VIII) is described below.

[0149] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0150]

[0151] It should be noted that the above listed structural formulas are examples of the structure of the functional layer material F, and are not limitations on the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not a part of the structural formula structure, wherein x is a positive integer.

[0152] In some embodiments, the functional layer material F is selected from any one of the structures shown in the following general formula (III).

[0153]

[0154] It can be understood that when L3 in the structure shown in general formula (II) is connected to the 1" carbon of the IA-1 part (i.e., the phenanthryl group), the structure shown in general formula (II) can be transformed into the structure shown in general formula (III). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 1" carbon of the IA-1 part and the structure when L3 is connected to the 10" carbon of the IA-1 part are the same structure.

[0155] An exemplary structure of the functional layer material F in the structure represented by the general formula (III) is described below.

[0156] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-4), (F-8), (F-12), (F-16), (F-20), and (F-24) above.

[0157] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-31), (F-35), (F-39), (F-43), (F-47), (F-51), (F-55), (F-58), and (F-63).

[0158] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown in (F-67) above.

[0159] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown in (F-71) above.

[0160] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0161] In some embodiments, the functional layer material F is selected from any one of the structures shown in the following general formula (IV).

[0162]

[0163] It can be understood that when L3 in the structure shown in general formula (II) is connected to the 4" carbon of the IA-1 part (i.e., the phenanthryl group), the structure shown in general formula (II) can be transformed into the structure shown in general formula (IV). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 4" carbon of the IA-1 part and the structure when L3 is connected to the 7" carbon of the IA-1 part are the same structure.

[0164] An exemplary structure of the functional layer material F in the structure represented by the general formula (IV) is described below.

[0165] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-3), (F-7), (F-11), (F-14), (F-18), and (F-23) above.

[0166] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-30), (F-34), (F-38), (F-42), (F-46), (F-53), (F-49), (F-59), and (F-62).

[0167] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown in (F-66) above.

[0168] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown in (F-69) above.

[0169] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0170] In some embodiments, the functional layer material F is selected from any one of the structures represented by the following general formula (VIIII).

[0171]

[0172] It can be understood that when L3 in the structure shown in general formula (II) is connected to the 5" carbon of the IA-1 part (i.e., the phenanthryl group), the structure shown in general formula (II) can be transformed into the structure shown in general formula (VIIII). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 5" carbon of the IA-1 part and the structure when L3 is connected to the 6" carbon of the IA-1 part are the same structure.

[0173] An exemplary structure of the functional layer material F in the structure represented by the general formula (VIIII) is described below.

[0174] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-1), (F-5), (F-9), (F-13), (F-17), (F-21), (F-25), (F-26), and (F-27).

[0175] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-28), (F-32), (F-36), (F-40), (F-44), (F-48), (F-52), (F-56), and (F-60).

[0176] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown in (F-64) above.

[0177] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown above (F-68).

[0178] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0179] In some embodiments, the functional layer material F is selected from any one of the structures shown in the following general formula (X).

[0180]

[0181] It can be understood that when L3 in the structure shown in general formula (II) is connected to the 3" carbon of the IA-1 part (i.e., the phenanthryl group), the structure shown in general formula (II) can be transformed into the structure shown in general formula (X). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 3" carbon of the IA-1 part and the structure when L3 is connected to the 8" carbon of the IA-1 part are the same structure.

[0182] An exemplary structure of the functional layer material F in the structure represented by the general formula (X) is described below.

[0183] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-2), (F-6), (F-10), (F-15), (F-19), and (F-22) above.

[0184] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-29), (F-33), (F-37), (F-41), (F-45), (F-50), (F-54), (F-57), and (F-61).

[0185] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown in (F-65) above.

[0186] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown above (F-70).

[0187] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0188] In order to improve the molecular stability of the functional layer material F, in some embodiments, when the functional layer material F is selected from any one of the structures shown in general formula (I), the structure shown in general formula (I) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures shown in general formula (II), the structure shown in general formula (II) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures shown in general formula (III), the structure shown in general formula (III) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures shown in general formula (IV), the structure shown in general formula (IV) contains at least one deuterium. Or,

[0189] In the case where the functional layer material F is selected from any one of the structures represented by the general formula (V), the structure represented by the general formula (V) contains at least one deuterium; or, in the case where the functional layer material F is selected from any one of the structures represented by the general formula (VI), the structure represented by the general formula (VI) contains at least one deuterium; or, in the case where the functional layer material F is selected from any one of the structures represented by the general formula (VII), the structure represented by the general formula (VII) contains at least one deuterium; or, in the case where the functional layer material F is selected from any one of the structures represented by the general formula (VIII), the structure represented by the general formula (VIII) contains at least one deuterium; or, in the case where the functional layer material F is selected from any one of the structures represented by the general formula (VIIII), the structure represented by the general formula (VIIII) contains at least one deuterium; or, in the case where the functional layer material F is selected from any one of the structures represented by the general formula (X), the structure represented by the general formula (X) contains at least one deuterium.

[0190] Since the atomic weight of deuterium is twice that of hydrogen, the physical properties of the functional layer material F will change by setting up the structure shown in the above general formula containing at least one deuterium. Specifically, after the functional layer material F is replaced by deuterium, it can effectively suppress molecular vibration, reduce bond length, increase bond energy, and improve molecular stability. In this way, the stability of the functional layer material F is improved, and the service life of the light-emitting device 100 can be extended.

[0191] The following uses the structure represented by the general formula (II) as an example to explain the substitution position of deuterium. The structure represented by the general formula (II) contains at least one deuterium, which means that the structure represented by the general formula (II) satisfies at least one of the following five conditions: (1) in the IA-1 part, at least one carbon substituent is deuterium or contains deuterium; (2) in the case where Y is selected from O and S, in the IB part, at least one carbon substituent among carbons 1 to 12 is deuterium or contains deuterium; or, in the case where Y is selected from N (R4) and C (R5R6), in the IB part, at least one substituent among carbons 1 to 12 and Y is deuterium or contains deuterium; (3) in the IC part, at least one carbon substituent is deuterium or contains deuterium; (4) in L1, L2 and L3, at least one substituent is deuterium or contains deuterium; (5) in R1, R2 and R3, at least one is deuterium or contains deuterium. That is to say, there is no limitation on the substitution position of deuterium in the structure represented by general formula (II). For understanding of other general formulas containing at least one deuterium, reference can be made to the above content, which will not be repeated here.

[0192] The following describes an exemplary structure of the functional layer material F when the general formula (VI) contains at least one deuterium.

[0193] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-44), (F-45), (F-46), and (F-47) above.

[0194] As shown in the above structural formulas (F-44), (F-45), (F-46) and (F-47), it can be seen that in the structure shown in the general formula (VI), there is no limitation on the position of deuterium substitution. For example, the deuterium substitution position can be located in the L2 part, as shown in (F-47); or, the deuterium substitution position can be located in the R2 part, as shown in (F-46); or, the deuterium substitution position can be located in the R1 part, as shown in (F-44) and (F-45).

[0195] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0196] In some embodiments, when m is greater than 2, two adjacent R3 groups can be bonded to form a ring.

[0197] It can be understood that, on the first aspect, when two adjacent R3 are bonded to form a ring, in the IA-1 part of the structure shown in the general formula (II), the number of aromatic rings forming a condensed aromatic group is greater than three, that is, at least one aromatic ring is fused with the phenanthryl group. In this way, the first substitution unit IA part of the structure of the functional layer material F can have a larger conjugated area and can produce a better conjugated effect. In this way, with the cooperation of the second substitution unit IB and the third substitution unit IC, the luminous efficiency of the light-emitting device 100 can be relatively higher, the voltage can be relatively lower, and the service life can be extended. On the second aspect, when two adjacent R3s are bonded to form a ring, the portion connected to form a ring can increase the overall rigidity of the molecule of the functional layer material F, thereby having a higher glass transition temperature Tg, increasing the stability of the material, and thereby extending its life; on the third aspect, compared to the structure in which two adjacent R3s exist but are not connected to form a ring, two adjacent R3s bonded to form a ring can appropriately reduce the three-dimensionality of the structure of the functional layer material F, thereby improving the mobility; on the fourth aspect, by setting up two adjacent R3s bonded to form a ring, the variety of the functional layer material F can be increased, so that the functional layer material F can be combined with different types of electron transport materials to achieve carrier balance.

[0198] The following describes an exemplary structure of the functional layer material F when two adjacent R3 are bonded to form a ring.

[0199] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-32), (F-33), (F-34), and (F-35) above.

[0200] As shown in the above structural formulas (F-32), (F-33), (F-34) and (F-35), the functional layer material F has no limitation on the position of two adjacent R3 bonds to form a ring in the structure shown in the general formula (II). For example, the positions at which two adjacent R3s bond to form a ring may be the positions of carbon numbers 2” and 3”, that is, two adjacent R3s may form an aromatic ring with carbon numbers 2” and 3”, as shown in (F-32); or, the positions at which two adjacent R3s bond to form a ring may be the positions of carbon numbers 9” and 10”, that is, two adjacent R3s may form an aromatic ring with carbon numbers 9” and 10”, as shown in (F-33); or, the positions at which two adjacent R3s bond to form a ring may be the positions of carbon numbers 1” and 2”, that is, two adjacent R3s may form an aromatic ring with carbon numbers 1” and 2”, as shown in (F-34); or, the positions at which two adjacent R3s bond to form a ring may be the positions of carbon numbers 3” and 4”, that is, two adjacent R3s may form an aromatic ring with carbon numbers 3” and 4”, as shown in (F-35). It should be noted that the position of two adjacent R3s bonded to form a ring is represented by the carbon number. This number is only for illustrating the position of two adjacent R3s bonded to form a ring and the relative relationship between the connection position of L3 and the phenanthryl group, and does not limit the structure of the functional layer material F.

[0201] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0202] In some embodiments, when q is greater than 2, two adjacent R1s can be bonded to form a ring.

[0203] It is understood that when two adjacent R1s are bonded to form a ring, at least one benzene ring is fused with the ring formed by the bonding of two adjacent R1s in the IB portion of the structure shown in the general formula (I). It should be noted that when the benzene ring is fused with the ring formed by the bonding of two adjacent R1s, the position of the shared carbon atom is not limited herein.

[0204] By setting that two adjacent R1s can be bonded to form a ring, on the first hand, the part connected to form a ring can increase the overall rigidity of the molecule of the functional layer material F, thereby having a higher glass transition temperature Tg, increasing the stability of the material, and thereby extending the life; on the second hand, compared with the structure in which two adjacent R1s exist but are not connected to form a ring, the two adjacent R1s bonded to form a ring can appropriately reduce the three-dimensionality of the structure of the functional layer material F, thereby improving the mobility; on the third hand, by setting that two adjacent R1s are bonded to form a ring, the variety of the functional layer material F can be increased, so that the functional layer material F can be matched with different types of electron transport materials to achieve carrier balance.

[0205] In some embodiments, when n is greater than 2, two adjacent R2 groups can be bonded to form a ring.

[0206] It is understood that when two adjacent R2s are bonded to form a ring, at least one benzene ring is fused with the ring formed by the bonding of two adjacent R2s in the IC portion of the structure shown in the general formula (I). It should be noted that when the benzene ring is fused with the ring formed by the bonding of two adjacent R2s, the position of the shared carbon atom is not limited herein.

[0207] By setting that two adjacent R2s can be bonded to form a ring, on the first hand, the part connected to form a ring can increase the overall rigidity of the molecule of the functional layer material F, thereby having a higher glass transition temperature Tg, increasing the stability of the material, and thereby extending the life; on the second hand, compared with the structure in which two adjacent R2s exist but are not connected to form a ring, the two adjacent R2s bonded to form a ring can appropriately reduce the three-dimensionality of the structure of the functional layer material F, thereby improving the mobility; on the third hand, by setting that two adjacent R2s are bonded to form a ring, the variety of the functional layer material F can be increased, so that the functional layer material F can be matched with different types of electron transport materials to achieve carrier balance.

[0208] The following uses the functional layer material F shown in the structural formulas (F-1) and (F-2) as an example to introduce the synthesis process of the functional layer material F.

[0209] In the related art, carbon-carbon coupling reaction and carbon-nitrogen coupling reaction are widely used in the synthesis of organic materials, and examples of carbon-carbon coupling reaction include Suzuki coupling reaction, Negishi coupling reaction, Yamamoto coupling reaction, Grignard coupling reaction, Stille coupling reaction, and Heck coupling reaction. Examples of carbon-nitrogen coupling reaction include Buchwald coupling reaction, Ullmann coupling, silylation reaction, phosphating reaction, borylation reaction, and polycondensation reaction.

[0210] The above reaction is, for example, shown in the following reaction formula (A):

[0211]

[0212] It should be noted that the catalyst of the general reaction formula (A) is Pb2(dba)3 (tridibenzylideneacetone dipalladium), P(t-Bu)3 (tri(tert-butyl)phosphine) and NaOt-Bu (sodium tert-butoxide), and the reaction solvent is toluene. The catalyst of the general reaction formula (B) is lead (Pb). X is one of chlorine, bromine and iodine. Ar d ,Ar b ,Ar c is a group to be connected by coupling reaction.

[0213] Illustratively, based on the above general reaction formula (A), the method for preparing the functional layer material (F-1) includes steps S1-S3.

[0214]

[0215] S1: Add p-bromoiodobenzene (15mmol), carbazole (15mmol) and toluene (50ml) to the reaction vessel, dissolve p-bromoiodobenzene and carbazole in toluene, and then add tridibenzylideneacetone dipalladium Pd2(dba)3 (0.15mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.8mmol) and sodium tert-butoxide t-BuONa (45mmol) under nitrogen atmosphere. After addition, the reaction temperature is slowly raised to 110°C, and the mixture is stirred at this temperature for 10h. Distilled water is then added to the reaction solution, and the reaction solution is extracted with ethyl acetate. The organic layer obtained by the extraction is then dried with magnesium sulfate, and the solvent is removed with a rotary evaporator. The remaining substance is purified by column chromatography to obtain the intermediate compound Sub-1 with a yield of 80%.

[0216]

[0217] S2: 9-Aminophenanthrene (15mmol) and 2-bromodibenzofuran (15mmol) and toluene (50ml) were added to the reaction vessel, 9-aminophenanthrene and 2-bromodibenzofuran were dissolved in toluene, and then tridibenzylideneacetone dipalladium Pd2(dba)3 (0.15mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.8mmol) and sodium tert-butoxide t-BuONa (45mmol) were added under nitrogen atmosphere. After addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10h. Distilled water was then added to the reaction solution, and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried with magnesium sulfate, and the solvent was removed with a rotary evaporator. The remaining substance was purified by column chromatography to obtain the intermediate compound sub-2 with a yield of 78%.

[0218]

[0219] S3: Add intermediate compound Sub-1 (12mmol), intermediate compound Sub-2 (12mmol) and toluene (40ml) to the reaction vessel, dissolve intermediate compound Sub-1 and intermediate compound Sub-2 in toluene, and then add tridibenzylideneacetone dipalladium Pd2(dba)3 (0.12mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.64mmol) and sodium tert-butoxide t-BuONa (36mmol) under nitrogen atmosphere. After addition, slowly raise the reaction temperature to 110°C, and keep the mixture stirred at this temperature for 10h. Then add distilled water to the reaction solution, and extract the reaction solution with ethyl acetate. Then dry the extracted organic layer with magnesium sulfate, and remove the solvent with a rotary evaporator. Purify the remaining substance by column chromatography to obtain functional layer material (F-1) with a yield of 75%.

[0220] Illustratively, based on the above general reaction formula (A), the method for preparing the functional layer material (F-2) includes steps P1 to P3.

[0221]

[0222] P1: p-Bromoiodobenzene (15 mmol), carbazole (15 mmol) and toluene (50 ml) were added to a reaction vessel, p-Bromoiodobenzene and carbazole were dissolved in toluene, and then tridibenzylideneacetone dipalladium Pd2(dba)3 (0.15 mmol), (tert-butyl)phosphine P(t-Bu)3 (0.8 mmol) and sodium tert-butoxide t-BuONa (45 mmol) were added under a nitrogen atmosphere. After the addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10 hours. Distilled water was then added to the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried using magnesium sulfate, and the solvent was removed using a rotary evaporator.

[0223] The remaining material was purified by column chromatography to obtain the intermediate compound Sub-1 with a yield of 80%.

[0224]

[0225] P2: 2-Aminophenanthrene (15mmol) and 2-bromodibenzofuran (15mmol) and toluene (50ml) were added to the reaction vessel, 2-phenanthrenylamine and 2-bromodibenzofuran were dissolved in toluene, and then tridibenzylideneacetone dipalladium Pd2(dba)3 (0.15mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.8mmol) and sodium tert-butoxide t-BuONa (45mmol) were added under nitrogen atmosphere. After addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10h. Distilled water was then added to the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried with magnesium sulfate, and the solvent was removed with a rotary evaporator. The remaining substance was purified by column chromatography to obtain the intermediate compound Sub-3 with a yield of 75%.

[0226]

[0227] P3: Add intermediate compound Sub-1 (12 mmol), intermediate compound Sub-3 (12 mmol) and toluene (40 ml) to the reaction vessel, dissolve intermediate compound Sub-1 and intermediate compound Sub-3 in toluene, and then add tridibenzylideneacetone dipalladium Pd2(dba)3 (0.12 mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.64 mmol) and sodium tert-butoxide t-BuONa (36 mmol) under nitrogen atmosphere. After addition, slowly raise the reaction temperature to 110°C, and keep the temperature and stir the mixture for 10 hours. Then, add distilled water to the reaction solution and extract the reaction solution with ethyl acetate. Then, dry the organic layer obtained by extraction with magnesium sulfate, and remove the solvent with a rotary evaporator. Purify the remaining substance by column chromatography to obtain functional layer material (F-2) with a yield of 77%.

[0228] On the other hand, Figure 1 As shown, a light emitting device 100 is provided, and the structure of the light emitting device 100 is introduced below.

[0229] Some embodiments of the present disclosure provide a light emitting device 100, such as Figure 1 As shown, it includes a cathode 110 and an anode 120 arranged opposite to each other, and at least one light-emitting unit 130 arranged between the cathode 110 and the anode 120; the light-emitting unit 130 includes: a light-emitting layer 131 and a first type functional layer 132 arranged on a side of the light-emitting layer 131 close to the anode 120; the material of the first type functional layer 132 includes the functional layer material F as described in any of the above embodiments. The light-emitting device 100 is, for example, an OLED light-emitting device.

[0230] The light emitting device 100 includes at least one light emitting unit 130. When the light emitting device 100 includes one light emitting unit 130, the light emitting device 100 is a single-layer light emitting device 100. When the light emitting device 100 includes multiple light emitting units 130, the light emitting device 100 is a stacked light emitting device 100, and the multiple light emitting units 130 of the stacked light emitting device 100 are sequentially connected in the vertical direction of the light emitting surface. The vertical direction of the light emitting surface is as shown in the figure. Figure 1 The first direction P shown in .

[0231] Based on the above structure, the light-emitting principle of the light-emitting device 100 is: through the circuit connected by the cathode 110 and the anode 120, the anode 120 is used to inject holes into the light-emitting layer 131, and the cathode 110 injects electrons into the light-emitting layer 131. The injected electrons and holes form excitons (i.e., electron-hole pairs) in the light-emitting layer 131, and the excitons return to the ground state through radiation transition and emit photons. It can be seen that in the light-emitting process of the light-emitting device 100, the two processes of effective charge injection and rapid charge transfer are indispensable. The above-mentioned charges are holes or electrons.

[0232] The above-mentioned first functional layer 132 is arranged on the side of the light-emitting layer 131 close to the anode 120, and is configured to transport holes and / or block electrons; firstly, it can realize effective hole injection and rapid hole transport; secondly, it can make the electrons stay in the light-emitting layer 131 as much as possible, so that the electrons and holes are balanced during the light-emitting process, thereby improving the light-emitting efficiency of the light-emitting layer 131.

[0233] By setting the material of the first type functional layer 132 including the functional layer material F, on the one hand, the functional layer material F can play the function of transporting holes and / or blocking electrons, so as to achieve effective hole injection and fast hole transport. On the other hand, since the structural formula of the functional layer material F includes the second substitution unit IB, the heteroatom X or Y in the second substitution unit IB can improve the hole transport ability of the functional layer material F, increase the amount of holes transmitted to the light-emitting layer 131, and improve the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the second substitution unit IB has a higher triplet energy level T1, the functional layer material F can have a relatively higher triplet energy level T1, and can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131, and the luminous efficiency of the light-emitting device 100 can be effectively improved. On the third aspect, since the structural formula of the functional layer material F includes the third substitution unit IC containing a carbazole group, the functional layer material F has a suitable highest occupied molecular orbital energy level (HOMO), which reduces the energy gap (GAP) that needs to be overcome when the hole is transmitted from the first type functional layer 132 to the light-emitting layer 131, so that the voltage driving the light-emitting device 100 to emit light can be effectively reduced, so that the power consumption of the light-emitting device 100 can be reduced. On the fourth aspect, since the structural formula of the functional layer material F includes the first substitution unit IA containing a condensed ring aromatic group, the functional layer material F has relatively good conjugation, and under the cooperation of the second substitution unit IB and the third substitution unit IC, the light-emitting device 100 can have a relatively higher luminous efficiency, a relatively lower voltage, and a longer service life.

[0234] It should be noted that, when the light-emitting device 100 is a stacked light-emitting device, the first type functional layer 132 including the functional layer material F may be located in one of the plurality of light-emitting units 130; or, may be located in a portion of the plurality of light-emitting units 130; or, may be located in each of the plurality of light-emitting units 130. That is, when the light-emitting device 100 is a stacked light-emitting device 100, the number of the light-emitting units 130 including the functional layer material F is not limited herein.

[0235] In some embodiments, Figure 1 As shown, the first type functional layer 132 includes a plurality of sub-functional layers 1321 , and at least one sub-functional layer 1321 of the plurality of sub-functional layers 1321 includes a functional layer material F.

[0236] It can be understood that when the first type of functional layer 132 includes multiple sub-functional layers 1321, by setting at least one sub-functional layer 1321 among the multiple sub-functional layers 1321 to include functional layer material F, the luminous efficiency of the light-emitting device 100 can be effectively improved, the voltage driving the light-emitting device 100 to emit light can be effectively reduced, and the service life of the light-emitting device 100 can be extended.

[0237] For example, Figure 1 As shown, the first type functional layer 132 includes any one or more of a hole injection functional layer 13211 , a hole transport functional layer 13212 and an electron blocking functional layer 13213 .

[0238] In some embodiments, Figure 1 As shown, the multiple sub-functional layers 1321 include an electron blocking functional layer 13213, a hole injection functional layer 13211 and a hole transport functional layer 13212 which are stacked; the hole injection functional layer 13211, the hole transport functional layer 13212 and the electron blocking functional layer 13213 are arranged in sequence along a direction away from the anode 120; among the hole injection functional layer 13211, the hole transport functional layer 13212 and the electron blocking functional layer 13213, at least the electron blocking functional layer 13213 includes the functional layer material F.

[0239] Based on the structure shown in the above general formula, the functional layer material F has good exciton blocking performance. When at least the electron blocking functional layer 13213 of the plurality of sub-functional layers 1321 of the above-mentioned first type functional layer 132 includes the functional layer material F, the functional layer material F can be located close to the light-emitting layer 131 to play the function of blocking excitons, so that the excitons can be kept in the light-emitting layer 131 as much as possible, further improving the luminous efficiency of the light-emitting layer 131.

[0240] In some embodiments, Figure 1 As shown, the light-emitting unit 130 also includes a second functional layer 133, which is located on the side of the light-emitting layer 131 close to the cathode 110 and is configured to transmit electrons or block holes. First, it can achieve effective electron injection and rapid electron transmission, and second, it can block holes, which is beneficial to the balance between electrons and holes during the light-emitting process.

[0241] Exemplarily, the second type functional layer 133 includes any one or more of an electron injection functional layer 1331 , an electron transport functional layer 1332 , and a hole blocking functional layer 1333 .

[0242] like Figure 1As shown, when the second type of functional layer 133 includes an electron injection functional layer 1331, an electron transport functional layer 1332 and a hole blocking functional layer 1333, the second type of functional layer 133 is arranged in sequence in a direction away from the cathode 110, for example.

[0243] In some embodiments, the light-emitting layer 131 is configured to emit blue light; the material of the light-emitting layer 131 includes: a host material and a guest material; the BH structural formula of the host material is as follows.

[0244]

[0245] The structural formula of the guest material BD is shown below.

[0246]

[0247] The material of the light-emitting layer 131 includes a host material and a guest material. For example, the host material can be configured to transmit energy by fluorescence resonance energy transfer; the guest material D can be configured to obtain the energy of fluorescence resonance energy transfer of the host material and emit blue light.

[0248] It can be understood that when the light-emitting layer 131 is configured to emit blue light, the light-emitting device 100 is a blue light-emitting device. When the light-emitting device 100 is a blue light-emitting device, the following effects can be achieved by setting the material of the first functional layer 132 to include the functional layer material F: on the one hand, since the light-emitting layer 131 of the blue light-emitting device contains a relatively large amount of electrons, the material of the first functional layer 132 includes the functional layer material F, which can increase the amount of holes transmitted to the light-emitting layer 131, and can increase the probability of recombination of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. On the other hand, since the material of the light-emitting layer 131 of the blue light-emitting device has a relatively deep highest occupied molecular orbital energy level (HOMO), and the functional layer material F containing a carbazole group also has a deep highest occupied molecular orbital energy level (HOMO), in this way, the energy gap (GAP) that needs to be overcome when the first functional layer 132 is transmitted to the light-emitting layer 131 can be reduced, so that the voltage for driving the light-emitting device 100 to emit light is effectively reduced, so that the power consumption of the light-emitting device 100 can be reduced. It should be noted that the deeper highest occupied molecular orbital energy level (HOMO) mentioned here means that the absolute value of the highest occupied molecular orbital energy level (HOMO) is larger.

[0249] In order to objectively evaluate the technical effects of the embodiments of the present disclosure, the technical solutions provided by the present disclosure will be described in detail and exemplarily through the following experimental examples and comparative examples.

[0250] The materials involved in the following experimental examples and comparative examples include:

[0251]

[0252]

[0253] It should be noted that NPB, PD, EBM-1, HBL-1, ETL-1, and Liq in the above structural formulas are aliases for each structural formula and are not part of the structural formula.

[0254] The following examples and comparative examples calculate and compare the highest occupied molecular orbital energy level (HOMO) and triplet energy level (T1) of the functional layer material F.

[0255] In the following examples and comparative examples, the calculation method of the highest occupied molecular orbital energy level (HOMO) is the same, and the calculation method of the triplet energy level (T1) is the same, and the calculation results are shown in Table 1 below.

[0256] Table 1

[0257] HOMO T1 F-1 -5.00 2.64 F-3 -4.98 2.66 F-13 -4.99 2.63 F-48 -4.91 2.72 F-27 -4.97 2.62 EBM-1 -4.96 2.60

[0258] It should be noted that the unit of the highest occupied molecular orbital energy level (HOMO) and triplet energy level (T1) in Table 1 is electron volt, symbolized by eV. The structural formulas represented by Fx (x is a positive integer) and EBM-1 refer to the above content and will not be repeated here.

[0259] It can be seen from Table 1 that the highest occupied molecular orbital energy levels (HOMO) of the five functional layer materials F range from -4.91eV to -5.00eV, and the five functional layer materials F all have a deeper highest occupied molecular orbital energy level (HOMO). In this way, the energy gap (GAP) that holes need to overcome when transmitting from the first type of functional layer 132 to the light-emitting layer 131 can be reduced, and the voltage that drives the light-emitting device 100 to emit light can be effectively reduced. In this way, the power consumption of the light-emitting device 100 can be effectively reduced.

[0260] It can be seen from Table 1 that the triplet energy levels (T1) of the five functional layer materials F range from 2.62eV to -2.72eV, which are all greater than the triplet energy level of (EBM-1), indicating that the functional layer material F has a relatively high triplet energy level T1. In this way, the excitons in the light-emitting layer 131 can be blocked from transmitting toward the direction close to the first type of functional layer 132, so that more excitons can stay in the light-emitting layer 131, and the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0261] The following embodiments and comparative examples use different materials to make the electron blocking functional layer 13213 of the light emitting device 100, and compare the voltage, luminous efficiency, and device life of the light emitting device 100.

[0262] In the following comparative examples and embodiments, the test conditions of the light emitting device 100 are the same; the test conditions of the same type of materials are the same.

[0263] like Figure 1 As shown, the light-emitting device 100 in the following comparative examples and embodiments includes an anode 120 and a cathode 110 arranged opposite to each other, and a light-emitting unit 130 arranged between the cathode 110 and the anode 120, and the light-emitting unit 130 includes a first type of functional layer 132, a light-emitting layer 131, and a second type of functional layer 133. Among them, the first type of functional layer 132 includes a hole injection functional layer 13211, a hole transport functional layer 13212, and an electron blocking functional layer 13213 arranged in sequence in a direction away from the anode 120. The second type of functional layer 133 includes an electron injection functional layer 1331, an electron transport functional layer 1332, and a hole blocking functional layer 1333 arranged in sequence in a direction away from the cathode 110.

[0264] In the following comparative examples and embodiments, the thicknesses of the hole injection functional layer 13211, the hole transport functional layer 13212, the electron blocking functional layer 13213, the light-emitting layer 131, the hole blocking functional layer 1333, the electron transport functional layer 1332, and the electron injection functional layer 1331, which are stacked in the direction from the anode 120 to the cathode 110, are 10 nm, 80 nm, 10 nm, 20 nm, 5 nm, 30 nm, and 1 nm, respectively.

[0265] The following is a description of the parts of the film layer materials that are the same in the comparative examples and the embodiments. In the following comparative examples and embodiments, the material of the anode 120 is indium tin oxide (Indium Tin Oxide, ITO). The material of the hole injection functional layer 13211 includes the material shown in the structural formula (NPB) and the material shown in the structural formula (PD), and the mass ratio of the material shown in the structural formula (NPB) and the material shown in the structural formula (PD) is 97:3. The material of the hole transport functional layer 13212 is the material shown in the structural formula (NPB). The material of the light-emitting layer 131 includes a host material and a guest material, the structure of the host material is shown in the above structural formula (BH), the structure of the guest material is shown in the above structural formula (BD), and the mass ratio of the host material to the guest material is 99:1. The structure of the material of the hole blocking functional layer 1333 is shown in the structural formula (HBL-1), and the material is 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI). The material of the electron transport functional layer 1332 includes a material as shown in the structural formula (ETL-1) and a material as shown in the structural formula (Liq), and the mass ratio of the material as shown in the structural formula (ETL-1) to the material as shown in the structural formula (Liq) is 1:1. The material of the electron injection functional layer 1331 is lithium fluoride (LiF). The material of the cathode 110 is a magnesium-silver alloy.

[0266] The materials of the electron blocking functional layer 13213 are set differently in the following comparative examples and embodiments. Specifically, the structure of the material of the electron blocking functional layer 13213 of comparative example 1 is shown in structural formula (EBM-1). The structures of the materials of the electron blocking functional layer 13213 of embodiments 1 to 5 are shown in structural formulas (F-1), (F-3), (F-48), (F-45), and (F-67), respectively.

[0267] In order to more clearly describe the difference between the film material structure used in the light emitting device 100 in the embodiment and the comparative example, the following Table 2 is used to more clearly show the film material structure used in the light emitting device 100 in the embodiment and the comparative example.

[0268] Table 2

[0269]

[0270] It should be noted that in Table 2, HI represents the hole injection functional layer 13211, HT represents the hole transport functional layer 13212, EBL represents the electron blocking functional layer 13213, EML represents the light-emitting layer 131, HB represents the hole blocking functional layer 1333, ET represents the electron transport functional layer 1332, and EI represents the electron injection functional layer 1331. "A / B" in Table 2 means that the material of the film layer includes material A and material B. For example, the material of HI is NPB / PD, which means that the material of the hole injection functional layer 13211 includes a material with a structural formula of (NPB) and a material with a structural formula of (PD). "Ax" in Table 2 means that the corresponding structural formula is Ax. For example, the content of the sub-grid corresponding to EBL in Example 1 is "F-1", which means that the material of the electron blocking functional layer 13213 in Example 1 is the functional layer material F with a structural formula as shown in (F-1). Among them, the structural formulas represented by Fx (x is a positive integer), NPB, PD, EBM-1, BH, BD, HBL-1, ETL-1, and Liq are referred to above and will not be repeated here.

[0271] Based on the above materials, the voltage (V), luminous efficiency (Eff.), and device life (LT) of the light emitting device 100 of Examples 1 to 5 and Comparative Example 1 were tested. The data results of voltage (V), luminous efficiency (Eff.), and device life (LT) are based on Comparative Example 1, and the test results are shown in Table 3 below.

[0272] Table 3

[0273] Device structure V Eff. LT Comparative Example 1 100％ 100％ 100％ Example 1 95％ 132％ 135％ Example 2 94％ 129％ 143％ Example 3 96％ 128％ 142％ Example 4 95％ 129％ 168％ Example 5 96％ 135％ 138％

[0274] As can be seen from Table 3, taking the test data of Comparative Example 1 as a reference, the voltage range of Examples 1 to 5 is 94% to 96%, which is lower than the voltage of Comparative Example 1. It can be seen that the voltage of Examples 1 to 5 is relatively low, which can reduce the power consumption of the light-emitting device 100. The luminous efficiency of Examples 1 to 5 ranges from 128% to 135%, which is higher than the luminous efficiency of Comparative Example 1. It can be seen that the luminous efficiency of Examples 1 to 5 is significantly improved. The device life of Examples 1 to 5 ranges from 135% to 168%, which is higher than the device life of Comparative Example 1. It can be seen that the device life of Examples 1 to 5 is significantly improved.

[0275] Among them, the device life of Example 4 is 168%, which is significantly higher than that of other examples and comparative examples. This is because the structure of the material of the electron blocking functional layer 13213 of Example 4 is as shown in the structural formula (F-45). In its second substitution unit IB part, it contains a deuterium substituent, which can effectively inhibit molecular vibration, reduce bond length, and increase bond energy, thereby improving molecular stability. In this way, the stability of the functional layer material F is improved, and the service life of the light-emitting device 100 can be further extended.

[0276] Therefore, it can be seen from the above tests that in the light-emitting device 100 provided by the present invention, an electron blocking functional layer 13213 containing a functional layer material F is provided, and a dibenzofuran structure or a dibenzothiophene structure is included in the second substitution unit IB of the functional layer material F. In this way, the heteroatom oxygen in the dibenzofuran structure or the heteroatom sulfur in the dibenzothiophene structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, increase the recombination probability of holes and electrons in the light-emitting layer 131, and improve the emission efficiency. Moreover, by setting the second substitution unit IB to be connected to nitrogen, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type of functional layer 132, so that more excitons can stay in the light-emitting layer 131, and the luminescence efficiency of the light-emitting device 100 is effectively improved. Moreover, the third substituent group IC of the functional layer material F contains a carbazole group connected to nitrogen, which can make the functional layer material F have a deeper highest occupied molecular orbital energy level (HOMO), reducing the energy gap (GAP) that needs to be overcome when holes are transmitted from the first type functional layer 132 to the light-emitting layer 131, which is beneficial to reducing the voltage of the light-emitting device 100, thereby reducing the power consumption of the light-emitting device 100.

[0277] It can be seen that in the light-emitting device 100 provided in the present disclosure, by providing the first type functional layer 132 containing the functional layer material F, the device life and luminous efficiency can be effectively improved, and the voltage and power consumption of the light-emitting device 100 can be effectively reduced.

[0278] Some embodiments of the present disclosure further provide a display panel 1000, such as Figure 2 As shown, the display panel 1000 includes the light emitting device 100 as described in any of the above embodiments.

[0279] In some embodiments, Figure 2As shown, the display panel 1000 includes a base substrate 200, an array layer 300 stacked on the base substrate 200, a light-emitting functional layer 400 and an encapsulation layer 500. The light-emitting functional layer 400 is located on one side of the array layer 300. The array layer 300 includes a plurality of pixel driving circuits 310, wherein the pixel driving circuits 310 include a plurality of transistors TFT. The light-emitting functional layer 400 includes a plurality of light-emitting devices 100, and the plurality of light-emitting devices 100 are arranged along the second direction Q.

[0280] In some examples, such as Figure 2 As shown, multiple pixel driving circuits 310 and multiple light emitting devices 100 may be coupled one-to-one. In other examples, one pixel driving circuit 310 may be coupled to multiple light emitting devices 100 , or multiple pixel driving circuits 310 may be coupled to one light emitting device 100 .

[0281] Exemplarily, in the display panel 1000, the pixel driving circuit 310 can generate a driving current. Each light emitting device 100 can emit light under the driving action of the driving current generated by the corresponding pixel driving circuit 310, and the lights emitted by the multiple light emitting devices 100 cooperate with each other, so that the display panel 1000 realizes the display function.

[0282] In some embodiments, Figure 3 As shown, the multiple light emitting devices 100 of the display panel 1000 include a red light emitting device 101, a green light emitting device 102 and a blue light emitting device 103. Under the action of the driving voltage, the red light emitting device 1001 emits red light, the green light emitting device 102 emits green light, and the blue light emitting device 103 emits blue light.

[0283] It should be noted that Figure 3 This is a simplified schematic diagram obtained after removing other film layers in the display panel 1000 except for the film layers related to the light emitting device 100. Figure 3 In the figure, multiple light-emitting devices 100 are, for example, a red light-emitting device 101, a green light-emitting device 102 and a blue light-emitting device 103. Each light-emitting device 100 includes a corresponding light-emitting layer 131 and an anode 120. Except for the light-emitting layer 131 and the anode 120, other film layers are connected to form a whole for sharing.

[0284] The beneficial effects of the display panel 1000 are the same as the beneficial effects of the light emitting device 100 provided in the above embodiment of the present disclosure, and will not be described in detail herein.

[0285] like Figure 4 As shown, some embodiments of the present disclosure further provide a display device 2000 , which includes: a display panel 1000 .

[0286] In some examples, the display device 2000 may be, for example, an OLED (Organic Light Emitting Diode) display device.

[0287] For example, Figure 4 As shown, the display device 2000 further includes a driving chip 2100. The driving chip 2100 is used to drive the display panel 1000 to display.

[0288] In some examples, the driver chip 2100 is electrically connected to the display panel 1000 through a flexible circuit board, and is bent to the back of the display panel 1000 along with the flexible circuit board to narrow the frame of the display device 2000 and increase the display area. Figure 4 The dotted line indicates that the driving chip 2100 is on the back of the display panel 1000 .

[0289] In addition, the display device 2000 may further include an under-screen camera and an under-screen fingerprint recognition sensor, so that the display device 2000 can realize a variety of different functions such as taking pictures, recording videos, fingerprint recognition or face recognition.

[0290] The display device 2000 described above can be any display device that displays either motion (e.g., video) or fixed (e.g., still images) and whether text or images. More specifically, it is expected that the display device 2000 of the embodiment described can be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, video cameras, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, car displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rear-view cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0291] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A functional layer material, characterized in that: Any one selected from the structures shown in the following general formula (I); Wherein, IA represents a first substitution unit, comprising at least one fused ring aromatic group; X is selected from any one of O, S and Se; Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond, and X and Y are the same or different; L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group; L2 is selected from any one of a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L2 and L1 are the same or different; R1, R2, R4, R5 and R6 are the same or different and are independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, A substituted or unsubstituted C6-C39 arylamine group, a substituted or unsubstituted C3-C39 cycloalkyl group, a substituted or unsubstituted C3-C39 heterocycloalkyl group, a substituted or unsubstituted C1-C39 alkylsilyl group, a substituted or unsubstituted C1-C39 alkylboryl group, a substituted or unsubstituted C6-C39 arylboryl group, a substituted or unsubstituted C6-C39 arylphosphine group, a substituted or unsubstituted C6-C39 arylsilyl group; The value of n is a positive integer greater than or equal to 1; The value of q is a positive integer greater than or equal to 1.

2. The functional layer material according to claim 1, characterized in that: The functional layer material is selected from any one of the structures shown in the following general formula (II); Wherein, L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L3 and L1 are the same or different, and L3 and L2 are the same or different; R3 is selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, substituted or unsubstituted C6-C39 arylamine, substituted or unsubstituted C3-C39 cycloalkyl, substituted or unsubstituted C3-C39 heterocycloalkyl, substituted or unsubstituted C1-C39 alkylsilyl, substituted or unsubstituted C1-C39 alkylboryl, substituted or unsubstituted C6-C39 arylboryl, substituted or unsubstituted C6-C39 arylphosphino, substituted or unsubstituted C6-C39 arylsilyl; The value of m is a positive integer greater than or equal to 1.

3. The functional layer material according to claim 1 or 2, characterized in that: X is oxygen, Y is a single bond; or, X is sulfur and Y is a single bond.

4. The functional layer material according to claim 1 or 2, characterized in that: X is oxygen, Y is oxygen; or, X is oxygen and Y is sulfur.

5. The functional layer material according to claim 2, characterized in that: The functional layer material is selected from any one of the structures shown in the following general formula (III); 6. The functional layer material according to claim 2, characterized in that: The functional layer material is selected from any one of the structures shown in the following general formula (IV); 7. The functional layer material according to claim 5 or 6, characterized in that: In the case where the functional layer material is selected from any one of the structures represented by general formula (I), the structure represented by general formula (I) contains at least one deuterium; or, In the case where the functional layer material is selected from any one of the structures represented by general formula (II), the structure represented by general formula (II) contains at least one deuterium; or, When the functional layer material is selected from any one of the structures represented by general formula (III), the structure represented by general formula (III) contains at least one deuterium; or, When the functional layer material is selected from any one of the structures represented by general formula (IV), the structure represented by general formula (IV) contains at least one deuterium.

8. The functional layer material according to claim 2, characterized in that: When m is greater than 2, two adjacent R3 groups can be bonded to form a ring.

9. The functional layer material according to claim 1 or 2, characterized in that: When q is greater than 2, two adjacent R1s can be bonded to form a ring.

10. The functional layer material according to claim 1 or 2, characterized in that: When n is greater than 2, two adjacent R2 groups can be bonded to form a ring.

11. The functional layer material according to claim 1 or 2, characterized in that: The functional layer material is used to transport holes and / or block electrons.

12. A light emitting device, characterized in that: include: A cathode and an anode disposed opposite to each other, and at least one light emitting unit disposed between the cathode and the anode; The light-emitting unit comprises: a light-emitting layer and a first type of functional layer arranged on a side of the light-emitting layer close to the anode; the material of the first type of functional layer comprises the functional layer material according to any one of claims 1 to 11.

13. The light emitting device according to claim 12, characterized in that: The first type of functional layer includes a plurality of sub-functional layers, and at least one sub-functional layer of the plurality of sub-functional layers includes the functional layer material.

14. The light emitting device according to claim 12 or 13, characterized in that: The plurality of sub-functional layers include an electron blocking functional layer, a hole injection functional layer and a hole transport functional layer which are stacked; the hole injection functional layer, the hole transport functional layer and the electron blocking functional layer are arranged in sequence in a direction away from the anode; Among the hole injection functional layer, the hole transport functional layer and the electron blocking functional layer, at least the electron blocking functional layer includes the functional layer material.

15. The light emitting device according to claim 14, characterized in that: The light-emitting layer is configured to emit blue light; the material of the light-emitting layer includes: a host material and a guest material; The main material structural formula is as follows: The structural formula of the guest material is as follows:

16. A display panel, characterized in that: comprising a plurality of light emitting devices according to any one of claims 12 to 15; It also includes: a pixel driving circuit electrically connected to the light emitting device, and the pixel driving circuit is used to drive the light emitting device to emit light.

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