Light-emitting device, display device, and electronic device

Abstract

Embodiments of the present application provide a light-emitting device, a display device and an electronic device, and relate to the technical field of optoelectronics. The light-emitting device comprises a hole transport layer, the hole transport layer comprises a first chiral light-emitting material having a first chiral structure and a second chiral light-emitting material having a second chiral structure, the chirality of the first chiral structure is opposite to the chirality of the second chiral structure, and the light-emitting device emits circularly polarized light; the light-emitting asymmetry factor glum of the hole transport layer satisfies: glum = 2 x |I S - R S R ‑2 ; wherein, I S represents the intensity of first polarized light emitted by the light-emitting device when the hole transport layer is formed by the first chiral light-emitting material, I R represents the intensity of second polarized light emitted by the light-emitting device when the hole transport layer is formed by the second chiral light-emitting material, and the rotation directions of the first polarized light and the second polarized light are opposite. Thus, the light-emitting efficiency of the light-emitting device can be high.​​​

Description

Technical Field

[0001] The present application relates to the field of optoelectronic technology, and in particular to a light-emitting device, a display device and an electronic device. Background Art

[0002] With the development of technology, organic light emitting diode (OLED) display devices are being increasingly studied and applied. However, current OLED display devices lack polarization characteristics and often suffer from problems such as low luminous efficiency and poor user experience.

[0003] Therefore, it is urgent to provide a new OLED display device to solve the above problems. Summary of the Invention

[0004] The embodiments of the present application provide a light-emitting device, a display device, and an electronic device. The hole transport layer of the light-emitting device has a first chiral light-emitting material and a second chiral light-emitting material, which can produce the same circular polarization angle, and has a smaller glum and a stronger CPL signal, thereby effectively improving the luminous efficiency of the light-emitting device.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] In a first aspect, a light-emitting device is provided, comprising an anode and a hole transport layer, a light-emitting layer, a cathode, and a circular polarizer stacked sequentially on the anode, the circular polarizer comprising a quarter-wave plate and a linear polarizer, the quarter-wave plate being disposed between the cathode and the linear polarizer; the hole transport layer being a mixture of a first chiral light-emitting material having a first chiral structure and a second chiral light-emitting material having a second chiral structure, the chirality of the first chiral structure being opposite to the chirality of the second chiral structure, and the luminescence asymmetry factor glum of the hole transport layer satisfying: glum = 2×|I S -I R | / |I S +I R |≥1E -2 , I S represents the intensity of the first polarized light emitted by the light-emitting device due to the hole transport layer composed of the first chiral light-emitting material, I R The hole transport layer composed of the second chiral luminescent material causes the light emitting device to emit a second polarized light with an intensity such that the first polarized light and the second polarized light rotate in opposite directions; the polarization direction of the polarized light converted from the first polarized light or the second polarized light after passing through the quarter-wave plate is the same as the transmission axis direction of the linear polarizer.

[0007] An embodiment of the present application provides a light-emitting device, in which a hole transport layer is formed by a mixture of a left-handed chiral light-emitting material and a right-handed chiral light-emitting material, and the polarization direction of the polarized light converted from the first polarized light or the second polarized light after passing through a quarter-wave plate is the same as the transmission axis direction of the linear polarizer. Thus, the emitted light is polarized together after passing through the circular polarizer, and directly passes through the circular polarizer with the same polarization angle to produce the same circular polarization angle, and the glum is small and the CPL signal is strong, thereby effectively improving the luminous efficiency of the circularly polarized light-emitting device.

[0008] In a possible implementation of the first aspect, the light-emitting device includes an anode and a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, a cathode and a circular polarizer stacked in sequence on the anode, the circular polarizer including a quarter-wave plate and a linear polarizer, and the quarter-wave plate is arranged between the cathode and the linear polarizer.

[0009] In this implementation, by combining the hole injection layer, hole transport layer, electron blocking layer, hole blocking layer, electron transport layer, electron injection layer and circular polarizer, the luminous efficiency of the circularly polarized light-emitting device can be effectively improved while having better performance.

[0010] In a possible implementation of the first aspect, a light-emitting device includes: an anode and a hole transport layer, a light-emitting layer, a cathode, and a color filter layer sequentially stacked on the anode; the hole transport layer includes a plurality of hole transport parts arranged in an array, adjacent hole transport parts are independently arranged, and there is a gap between adjacent hole transport parts, all hole transport parts are arranged in multiple rows and columns, and the chiral light-emitting material in two adjacent rows of hole transport parts and / or two adjacent columns of hole transport parts is any one of a first chiral light-emitting material or a second chiral light-emitting material; the chirality of the first chiral structure is opposite to the chirality of the second chiral structure, and the luminescence asymmetry factor glum of the hole transport layer satisfies: glum = 2×|I S -I R | / |I S +I R |≥1E -2 , I S represents the intensity of the first polarized light emitted by the light-emitting device due to the hole transport layer composed of the first chiral light-emitting material, I R It represents the intensity of the second polarized light emitted by the light-emitting device due to the hole transport layer composed of the second chiral light-emitting material. The rotation directions of the first polarized light and the second polarized light are opposite.

[0011] In this implementation, multiple discrete and spaced-apart hole transport parts in the hole transport layer are respectively composed of a first chiral light-emitting material or a second chiral light-emitting material, thereby making the hole transport layer have a first chiral light-emitting material and a second chiral light-emitting material. The chirality of the chiral light-emitting material will affect the polarization of the light emitted by the light-emitting layer. For example, light of opposite chirality will cause the rotation direction of the emitted light to be different, generating left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, and the glum is small and the CPL signal is strong, which effectively improves the luminous efficiency of the circularly polarized light-emitting device. In addition, when not paired with polarized glasses, the light-emitting device can achieve 2D display, and when paired with polarized glasses, it can achieve 3D display without the need for additional image processing.

[0012] In a possible implementation of the first aspect, the light-emitting device includes an anode and a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, a cathode and a color film layer stacked in sequence on the anode.

[0013] In this implementation, by combining the hole injection layer, hole transport layer, electron blocking layer, hole blocking layer, electron transport layer, electron injection layer and color filter layer, the luminous efficiency of the circularly polarized light-emitting device can be effectively improved while having better performance.

[0014] In a possible implementation of the first aspect, the hole transport layer includes a plurality of hole transport parts R, a plurality of hole transport parts G, and a plurality of hole transport parts B arranged in an array, all of the hole transport parts are arranged along the OX direction and the OY direction, the OX direction is perpendicular to the OY direction, adjacent hole transport parts are independently arranged, and there is a gap between adjacent hole transport parts; in each column, the chiral structures of the chiral light-emitting materials in the hole transport parts of two adjacent rows are different.

[0015] In this implementation, multiple discrete and spaced-apart hole transport sections in the hole transport layer are respectively composed of a first chiral luminescent material or a second chiral luminescent material. Since the chiral structure of the first chiral luminescent material is opposite to that of the second chiral luminescent material, the light emitted by the luminescent layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is strong. In addition, 3D display can be achieved when used with polarized glasses.

[0016] In a possible implementation of the first aspect, all hole transport units are divided into three rows and four columns along the OX direction and the OY direction. In the first row, the hole transport units in the first column, the hole transport units in the second column, and the hole transport units in the third column are all composed of the second chiral light-emitting material, and the hole transport units in the fourth column are composed of the first chiral light-emitting material; in the second row, the hole transport units in the first column, the hole transport units in the second column, and the hole transport units in the third column are all composed of the first chiral light-emitting material, and the hole transport units in the fourth column are composed of the second chiral light-emitting material; in the third row, the hole transport units in the first column, the hole transport units in the second column, and the hole transport units in the third column are all composed of the second chiral light-emitting material, and the hole transport units in the fourth column are composed of the first chiral light-emitting material.

[0017] In this implementation, multiple discrete and spaced-apart hole transport sections in the hole transport layer are respectively composed of a first chiral luminescent material or a second chiral luminescent material. Since the chiral structure of the first chiral luminescent material is opposite to that of the second chiral luminescent material, the light emitted by the luminescent layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is strong. In addition, 3D display can be achieved when used with polarized glasses.

[0018] In a possible implementation of the first aspect, the hole transport layer includes a plurality of hole transport parts R, a plurality of hole transport parts G and a plurality of hole transport parts B, all the hole transport parts R and all the hole transport parts B are alternately arranged along the OX direction and the OY direction to form a plurality of first rows and a plurality of first columns, all the hole transport parts are arrayed along the OX and OY directions to form a plurality of second rows and a plurality of second columns, the plurality of first rows and the plurality of second rows are alternately arranged along the OX direction and staggered in the OX direction, the plurality of first columns and the plurality of second columns are alternately arranged along the OY direction and staggered in the OY direction, wherein the OX direction is perpendicular to the OY direction; in each row, the chiral structures of the chiral light-emitting materials in the hole transport parts of adjacent columns are different.

[0019] In this implementation, multiple discrete and spaced-apart hole transport sections in the hole transport layer are respectively composed of a first chiral luminescent material or a second chiral luminescent material. Since the chiral structure of the first chiral luminescent material is opposite to that of the second chiral luminescent material, the light emitted by the luminescent layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is strong. In addition, 3D display can be achieved when used with polarized glasses.

[0020] In a possible implementation of the first aspect, all hole transport parts are divided into two first rows and three second rows along the OX direction, and all hole transport parts are divided into two first columns and three second columns along the OY direction. In the first first row, the hole transport part is composed of the second chiral light-emitting material, the first chiral light-emitting material, and the second chiral light-emitting material, respectively. In the first second row, the hole transport part is composed of the second chiral light-emitting material and the first chiral light-emitting material, respectively. In the second first row, the hole transport part is composed of the first chiral light-emitting material, the second chiral light-emitting material, and the first chiral light-emitting material, respectively. In the second second row, the hole transport part is composed of the second chiral light-emitting material and the first chiral light-emitting material, respectively. In the third first row, the hole transport part is composed of the second chiral light-emitting material, the first chiral light-emitting material, and the second chiral light-emitting material, respectively.

[0021] In this implementation, multiple discrete and spaced-apart hole transport sections in the hole transport layer are respectively composed of a first chiral luminescent material or a second chiral luminescent material. Since the chiral structure of the first chiral luminescent material is opposite to that of the second chiral luminescent material, the light emitted by the luminescent layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is strong. In addition, 3D display can be achieved when used with polarized glasses.

[0022] In a possible implementation of the first aspect, the area of ​​the hole transport portion B is larger than the area of ​​the hole transport portion R and the area of ​​the hole transport portion G, respectively, and the area of ​​the hole transport portion R and the area of ​​the hole transport portion G may be the same or different.

[0023] In this implementation, better RGB display can be achieved.

[0024] In a possible implementation of the first aspect, the hole transport layer includes a plurality of hole transport parts, all of which are a plurality of hole transport part groups arranged in an array, each hole transport part group includes a hole transport part R, a hole transport part G and a hole transport part B, and in each hole transport part group, the hole transport part R, the hole transport part G and the hole transport part B are arranged along the OX direction, and the hole transport part R and the hole transport part G are also arranged along the OY direction, wherein the OX direction is perpendicular to the OY direction; in each hole transport part group, the chiral structure of the chiral light-emitting material of the hole transport part R, the chiral structure of the chiral light-emitting material of the hole transport part G and the chiral structure of the chiral light-emitting material in the hole transport part B are the same, the chiral structures of the chiral light-emitting materials in the hole transport part groups of adjacent rows are different, and the chiral structures of the chiral light-emitting materials in the hole transport part groups of adjacent columns are different.

[0025] In this implementation, multiple discrete and spaced-apart hole transport sections in the hole transport layer are respectively composed of a first chiral luminescent material or a second chiral luminescent material. Since the chiral structure of the first chiral luminescent material is opposite to that of the second chiral luminescent material, the light emitted by the luminescent layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is strong. In addition, 3D display can be achieved when used with polarized glasses.

[0026] In a possible implementation of the first aspect, all hole transport parts are divided into a first hole transport part group 116 and a second hole transport part group in the first row, and a third hole transport part group and a fourth hole transport part group in the second row along the OX direction. All hole transport parts in the first hole transport part group and the fourth hole transport part group are composed of a second chiral light-emitting material, and all hole transport parts in the second hole transport part group and the third hole transport part group are composed of a first chiral light-emitting material.

[0027] In this implementation, multiple discrete and spaced-apart hole transport sections in the hole transport layer are respectively composed of a first chiral luminescent material or a second chiral luminescent material. Since the chiral structure of the first chiral luminescent material is opposite to that of the second chiral luminescent material, the light emitted by the luminescent layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is strong. In addition, 3D display can be achieved when used with polarized glasses.

[0028] In a possible implementation of the first aspect, the area of ​​the hole transport portion B is larger than the area of ​​the hole transport portion R and the area of ​​the hole transport portion G, respectively, and the area of ​​the hole transport portion R and the area of ​​the hole transport portion G may be the same or different.

[0029] In this implementation, better RGB display can be achieved.

[0030] In a possible implementation of the first aspect, when the first chiral luminescent material is a left-handed chiral luminescent material, the general structural formula of the left-handed chiral luminescent material is: The general structural formula of the left-handed chiral luminescent material has a first spatial configuration, the R1 group is located above the entire molecule in the first spatial configuration, and the group connected to the benzene ring of the R2 group is located above the entire molecule in the first spatial configuration, wherein, for , R1 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine, and R2 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine.

[0031] This implementation is simple and easy to implement.

[0032] In a possible implementation of the first aspect, when both R1 and R2 are carbazole, the chemical structure of the left-handed chiral luminescent material includes: wait.

[0033] This implementation is simple and easy to implement.

[0034] In a possible implementation of the first aspect, when the second chiral luminescent material is a right-handed chiral luminescent material, the general structural formula of the right-handed chiral luminescent material is: Among them, the general structural formula of the right-handed chiral luminescent material has a second spatial stereo configuration, the group connected to the benzene ring of the R3 group is located above the entire molecule in the second spatial stereo configuration, and the R4 group is located above the entire molecule in the second spatial stereo configuration; wherein R3 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine, and R4 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine.

[0035] This implementation is simple and easy to implement.

[0036] In a possible implementation of the first aspect, when both R3 and R4 are carbazole, the chemical structure of the right-handed chiral light-emitting material includes: wait.

[0037] This implementation is simple and easy to implement.

[0038] In a second aspect, a display device is provided, comprising a light-emitting device as in the first aspect or any possible implementation of the first aspect.

[0039] An embodiment of the present application provides a display device having the advantages of high luminous efficiency, high stability, long life, good display effect, high contrast, good imaging quality, and high product quality.

[0040] In a third aspect, an electronic device is provided, comprising a display device as in the second aspect or any possible implementation of the second aspect.

[0041] An embodiment of the present application provides an electronic device with good performance.

[0042] An embodiment of the present application provides a light-emitting device, in which a hole transport layer comprises a first chiral light-emitting material and a second chiral light-emitting material. Since the chiral structure of the first chiral light-emitting material is opposite to the chiral structure of the second chiral light-emitting material, the light emitted by the light-emitting layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, and the glum is small and the luminous efficiency is strong, thereby making the luminous efficiency of the display device using the light-emitting device high, and further improving the performance of the electronic device using the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of the overall structure of an electronic device provided in an embodiment of the present application;

[0044] Figure 2 for Figure 1 Schematic diagram of the disassembled structure of the electronic device;

[0045] Figure 3 A schematic structural diagram of a light-emitting device provided in an embodiment of the present application;

[0046] Figure 4 A schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0047] Figure 5 A schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0048] Figure 6 A schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0049] Figure 7 A schematic structural diagram of a hole transport layer provided in an embodiment of the present application;

[0050] Figure 8 A schematic structural diagram of another hole transport layer provided in an embodiment of the present application;

[0051] Figure 9 A schematic structural diagram of another hole transport layer provided in an embodiment of the present application;

[0052] Figure 10 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0053] Figure 11 A graph showing the circularly polarized electroluminescence characteristics of a red light-emitting device at a specific wavelength provided in an embodiment of the present application;

[0054] Figure 12 A glum curve diagram of a red light-emitting device at a specific wavelength provided in an embodiment of the present application;

[0055] Figure 13 A graph showing the circularly polarized electroluminescence characteristics of a green light-emitting device at a specific wavelength provided in an embodiment of the present application;

[0056] Figure 14 A glum curve diagram of a green light-emitting device at a specific wavelength provided in an embodiment of the present application;

[0057] Figure 15 A graph showing the circularly polarized electroluminescence characteristics of a blue light-emitting device at a specific wavelength provided in an embodiment of the present application;

[0058] Figure 16 A glum curve diagram of a blue light-emitting device at a specific wavelength provided in an embodiment of the present application.

[0059] Reference numerals:

[0060] 01-mobile phone; 100-display screen; 101-middle frame; 102-back cover; 103-circuit board assembly; 1031-main circuit board; 1032-electronic components; 104-battery;

[0061] 02-light-emitting device; 1-anode; 2-hole injection layer; 3-hole transport layer; 4-electron blocking layer; 5-light-emitting layer; 7-hole blocking layer; 8-electron transport layer; 9-electron injection layer; 10-cathode; 11-circular polarizer; 12-color filter layer; 121-red color filter unit; 122-green color filter unit; 123-blue color filter unit; 13-glass substrate; H-black matrix; 112-first row; 113-second row; 114-second column; 115-first column; 116-first hole transport unit group; 117-second hole transport unit group; 118-third hole transport unit group; 119-fourth hole transport unit group;

[0062] 03-display device; 200-red light-emitting device; 300-green light-emitting device; 400-blue light-emitting device; 500-substrate; 501-buffer layer; 502-active layer; 503-gate insulating layer; 504-gate; 505-first electrode; 506-insulating layer; 507-second electrode; 508-interlayer dielectric layer; 509-source; 510-drain; 511-planarization layer; 512-pixel defining layer; 513-spacer; 421-first inorganic layer; 422-second inorganic layer; 43-organic layer. DETAILED DESCRIPTION

[0063] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and their variations in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0064] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0065] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0066] In the embodiment of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0067] In addition, the character “ / ” in this article generally indicates that the previous and next related objects are in an “or” relationship.

[0068] In the embodiments of the present application, "multiple" means more than two (including two). Similarly, "multiple groups" means more than two groups (including two groups), and "multi-layer" means more than two layers (including two layers), unless otherwise clearly specified and limited.

[0069] In the embodiments of the present application, “at least one” means one or more.

[0070] In the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", and "horizontal" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, etc., and should not be understood as a limitation on the embodiments of the present application.

[0071] In the embodiments of the present application, the technical terms "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0072] Some of the terms used in the embodiments of the present application are explained below so that those skilled in the art can better understand them.

[0073] 1. Chiral luminescent materials

[0074] Chiral luminescent materials refer to molecular materials in chemistry that have the same composition but are mirror images (enantiomers) of each other in terms of spatial structure.

[0075] 2. Trade Off Effect

[0076] The trade-off effect refers to a balance / trade-off effect, which usually involves a trade-off between two parameters. For example, if A is prioritized, B will be harmed, and vice versa.

[0077] 3. Circularly polarized luminescence (CPL)

[0078] CPL refers to the phenomenon that a chiral luminescent material emits differential left-handed circularly polarized light and right-handed circularly polarized light after being excited.

[0079] 4. Luminescence asymmetry factor (glum)

[0080] Glum is a measure of the degree of asymmetry of a chiral luminescent material.

[0081] The above is a brief introduction to the nouns involved in the embodiments of this application, and no further details will be given below.

[0082] In modern life, the role of electronic devices such as laptops and mobile phones is becoming increasingly important and is gradually becoming one of the necessities of people's lives.

[0083] The present application provides an electronic device, and the specific type of the electronic device is not limited. In some embodiments, the electronic device may include consumer electronic terminal products, home electronic products, vehicle-mounted electronic products, financial terminal electronic products, and communication electronic products.

[0084] Among them, consumer electronic terminal products can include laptops, tablets (pads), laptops, handheld computers, personal computers (PCs), mobile phones, e-readers, desktop monitors, cellular phones, drones, personal digital assistants (PDAs), smart wearable devices (e.g., smart bracelets, smart watches, headphones, etc.), ultra-mobile personal computers (UMPCs), augmented reality (AR) / virtual reality (VR) devices and other Internet of Things (IoT) devices. Home electronic products can include televisions, smart door locks, remote controls, refrigerators, rechargeable small household appliances (e.g., soymilk makers, robot vacuums, etc.), printers, projectors, etc. In-vehicle electronic products can include in-vehicle navigation systems, in-vehicle high-density digital video discs (DVDs), etc. Financial terminal electronic products can include automated teller machines (ATMs) and self-service terminals. Communication electronic products can include communication equipment such as servers, storage devices, and base stations.

[0085] The embodiments of the present application do not limit the specific form of the electronic device. For the convenience of description, the following description will first be given by taking a mobile phone as an example.

[0086] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of an overall electronic device applicable to some embodiments of the present application. Figure 2 for Figure 1 Schematic diagram of the electronic device shown.

[0087] in, Figure 1 and Figure 2 The electronic devices shown are described using tablet phones as an example. In other embodiments, the electronic devices may also be other types of mobile phones, such as foldable phones.

[0088] exist Figure 1 and Figure 2 In the example of FIG, the electronic device may include a display screen 100, a middle frame 101, a rear shell 102, a circuit board assembly 103 and a battery 104. It is understood that, Figure 1 and Figure 2The following figures and the related drawings only schematically illustrate some components of the electronic device, and the actual shape, size, position and structure of these components are not affected by Figure 1 and Figure 2 and the limitations of the accompanying drawings below.

[0089] The specific structure of the electronic device to which the embodiments of the present application are applicable is further described below.

[0090] Please refer to Figure 1 and Figure 2 Taking the electronic device as a mobile phone 01 as an example, the mobile phone 01 may include a display screen 100 and a middle frame 101 , and the display screen 100 is located on one side of the middle frame 101 .

[0091] In applications, the display screen 100 can be used to display images, videos, etc. The display screen 100 here can be an OLED display screen, etc.

[0092] exist Figure 1 In the embodiment shown, the electronic device may be in the shape of a rectangular flat plate. Of course, the electronic device may also be in any other shape, depending on the actual application.

[0093] like Figure 2 As shown, the mobile phone 01 may further include structures such as a rear shell 102 , a circuit board assembly 103 and a battery 104 .

[0094] Among them, the back shell 102 can be set on the side of the middle frame 101 away from the display screen 100, and the back shell 102 and the middle frame 101 can enclose an internal accommodating space of the mobile phone 01, which can accommodate structures such as the circuit board assembly 103 and the battery 104.

[0095] The circuit board assembly 103 may include a main circuit board 1031 and electronic components 1032 , etc. The main circuit board 1031 may be used to carry the electronic components 1032 and perform signal interaction with the electronic components 1032 . Figure 2 The following description is made by taking the circuit board assembly 103 as an example, wherein the circuit board assembly 103 includes two electronic components 1032. Of course, the number of the electronic components 1032 is not limited to two, and the specific number depends on the actual application.

[0096] In applications, the main circuit board 1031 may include printed circuit boards (PCBs), flexible printed circuits (FPCs), etc.

[0097] In applications, the electronic components 1032 may include but are not limited to chips, resistors, capacitors, inductors, potentiometers, electron tubes, heat sinks, electromechanical components, connectors, discrete semiconductors, sensors, power supplies, switches, micro motors, electronic transformers, relays, subscriber identity modules (SIM) cards, etc.

[0098] The battery 104 can be used to provide power to structures in the mobile phone 01 such as the display screen 100 and the circuit board assembly 103 .

[0099] Of course, the mobile phone 01 may also include other structures such as a microphone, a speaker, and a camera, which will not be described one by one here.

[0100] Currently, the OLED light-emitting devices in OLED displays lack polarization properties. To achieve this, a linear polarizer is typically placed above the OLED light-emitting device to convert the emitted light into linearly polarized light. However, this process results in a significant loss in luminous efficiency, for example, up to approximately 56%.

[0101] As another example, a color filter layer is placed above the OLED light-emitting device instead of a linear polarizer. However, the light emitted from the OLED light-emitting device in this case is still unpolarized, and there is a certain trade-off between the luminous efficiency and the reflectivity of the OLED light-emitting device itself.

[0102] Based on the above description, it can be seen that the light emitted by the OLED light-emitting devices provided in the related art has no polarization characteristics, and cannot take into account both the luminous efficiency and the reflectivity of the OLED light-emitting device itself.

[0103] In view of this, an embodiment of the present application provides a light-emitting device, in which the hole transport layer has a first chiral light-emitting material and a second chiral light-emitting material. The light-emitting device can emit RGB color light and can produce the same circular polarization angle. In addition, the glum is small and the CPL signal is strong, thereby effectively improving the luminous efficiency of the light-emitting device.

[0104] Please combine the following Figure 3 and Figure 4 , the first light-emitting device 02 provided in the embodiment of the present application is described in detail.

[0105] like Figure 3 As shown, the light emitting device 02 provided in the embodiment of the present application includes: a glass substrate 13 and an anode 1, a hole transport layer 3, a light emitting layer 5, a cathode 10 and a circular polarizer 11 stacked in sequence on the glass substrate 13, and the circular polarizer 11 includes a quarter wave plate ( Figure 3 Not shown) and a linear polarizer ( Figure 3 (not shown), a quarter wave plate is provided between the cathode 10 and the linear polarizer, and electricity is passed between the anode 1 and the cathode 10 to generate an electric field.

[0106] The hole transport layer 3 is composed of a mixture of a first chiral luminescent material having a first chiral structure and a second chiral luminescent material having a second chiral structure, wherein the chirality of the first chiral structure is opposite to that of the second chiral structure; the luminescence asymmetry factor glum of the hole transport layer 3 satisfies: glum = 2×|I S -I R | / |I S +I R |≥1E -2 , where I S represents the intensity of the first polarized light emitted by the light-emitting device due to the hole transport layer composed of the first chiral light-emitting material, I R It represents the intensity of the second polarized light emitted by the light-emitting device due to the hole transport layer composed of the second chiral light-emitting material. The rotation directions of the first polarized light and the second polarized light are opposite.

[0107] The polarization direction of the polarized light converted from the first polarized light or the second polarized light after passing through the quarter-wave plate is the same as the transmission axis direction of the linear polarizer.

[0108] The chirality of the above-mentioned first chiral structure is opposite to the chirality of the second chiral structure, which means that: when the first chiral structure is a left-handed chiral structure, that is, the first chiral luminescent material is a left-handed chiral luminescent material, the second chiral structure is a right-handed chiral structure, that is, the second chiral luminescent material is a right-handed chiral luminescent material; or, when the first chiral structure is a right-handed chiral structure, that is, the first chiral luminescent material is a right-handed chiral luminescent material, the second chiral structure is a left-handed chiral structure, that is, the second chiral luminescent material is a left-handed chiral luminescent material, the specific details shall be subject to actual application.

[0109] The following embodiments of the present application are described by taking the case where the first chiral luminescent material is a left-handed chiral luminescent material and the second chiral luminescent material is a right-handed chiral luminescent material as an example.

[0110] In the case where the first chiral luminescent material is a left-handed chiral luminescent material, the general structural formula of the left-handed chiral luminescent material is: The general structural formula of the left-handed chiral luminescent material has a first spatial configuration, wherein the R1 group is located at the top of the entire molecule in the first spatial configuration, and the group connected to the benzene ring of the R2 group is located at the top of the entire molecule in the first spatial configuration. It should be noted that the molecular skeleton is 2,2'-R-based-binaphthyl, wherein the binaphthyl can also be hydrogenated biphenyl.

[0111] In the above middle, for Any one of, R1 is carbazole

[0112] Diphenylamine N-phenylcarbazole Triphenylamine Any one of, R2 is Any of .

[0113] Furthermore, when both R1 and R2 are In the case of , the chemical structure of the left-handed chiral luminescent material includes: wait.

[0114] in, The preparation method is as follows:

[0115]

[0116] S-1,1′-binaphthyl-2,2′-diamine (1 mmol), iodobenzene (4.4 mmol), sodium tert-butoxide (4.2 mmol) and catalyst tris(dibenzylideneacetone)dipalladium (0.05 mmol) were added to 20 mL of toluene and heated under reflux at 110° for 24 h under nitrogen protection; then, after cooling to room temperature, poured into 300 mL of cold water and extracted with dichloromethane 5 times; the combined organic phase was washed three times with saturated sodium chloride solution and then dried over sodium sulfate; the organic solvent was removed under reduced pressure to obtain a crude product, which was then subjected to column chromatography to obtain the final product, wherein the developing solvent was dichloromethane:petroleum ether = 1:5, and the yield was approximately 63%.

[0117] In the case where the second chiral luminescent material is a right-handed chiral luminescent material, the general structural formula of the right-handed chiral luminescent material is: Among them, the general structural formula of the right-handed chiral luminescent material has a second spatial stereo configuration, the group connected to the benzene ring of the R3 group is located above the entire molecule in the second spatial stereo configuration, and the R4 group is located above the entire molecule in the second spatial stereo configuration.

[0118] In the above middle, for Any one of, R3 is Any one of, R4 is Any of .

[0119] Furthermore, when both R3 and R4 are In the case of , the chemical structure of the right-handed chiral luminescent material includes: wait.

[0120] in, The preparation method is as follows:

[0121]

[0122] R-1,1′-binaphthyl-2,2′-diamine (1 mmol), iodobenzene (4.4 mmol), sodium tert-butoxide (4.2 mmol) and catalyst tris(dibenzylideneacetone)dipalladium (0.05 mmol) were added to 20 mL of toluene and heated under reflux at 110° for 24 h under nitrogen protection; then, after cooling to room temperature, poured into 300 mL of cold water and extracted with dichloromethane 5 times; the combined organic phase was washed three times with saturated sodium chloride solution and then dried over sodium sulfate; the organic solvent was removed under reduced pressure to obtain a crude product, which was then subjected to column chromatography to obtain the final product, wherein the developing solvent was dichloromethane:petroleum ether = 1:5, and the yield was 63%.

[0123] Thus, the left-handed chiral light-emitting material and the right-handed chiral light-emitting material are mixed together to form a hole transport layer.

[0124] In application, after the light-emitting device is manufactured, the polarization direction of the polarized light that can pass through the circular polarizer is determined. In the related art, when the hole transport layer formed by the chiral light-emitting material provided in the embodiment of the present application is not provided, the light after the left-handed light and the right-handed light pass through the circular polarizer can only be 50%, resulting in poor luminous efficiency. In the embodiment of the present application, the polarization direction of the polarized light converted from the first polarized light or the second polarized light after passing through the quarter-wave plate is the same as the transmission axis direction of the linear polarizer. For example, the polarized light converted from the left-handed polarized light after passing through the quarter-wave plate can pass through the linear polarizer. At this time, when the left-handed light passes through 60%, the circular polarizer also absorbs the right-handed light, for example, the right-handed light passes through 40%, thereby improving the luminous efficiency of the left-handed light, and then improving the luminous efficiency of the entire light-emitting device.

[0125] In the application, there is no specific limitation on the preparation process of the light-emitting device. For example, the light-emitting device can be prepared by vacuum evaporation to prepare each film layer in the light-emitting device, and a high-precision metal mask (FMM) is used for evaporation.

[0126] There is no specific limitation on the type of the light emitting device. For example, the light emitting device may be a top-emitting light emitting device or a bottom-emitting light emitting device.

[0127] In applications, there is no specific limitation on the material of the anode. For example, the material of the anode may be ITO (indium tin oxides) or the like.

[0128] The preparation process of the anode is not particularly limited. For example, a glass plate with ITO can be ultrasonically treated in deionized water and then dried at 100° C. to obtain the anode.

[0129] In the application, there is no specific limitation on the material of the cathode. For example, the material of the cathode may include metals, such as any one of magnesium (Mg), calcium (Ca), sodium (Na), potassium (K), titanium (Ti), indium (In), yttrium (Y), lithium (Li), gadolinium (Gd), aluminum (Al), silver (Ag), tin (Sn) and lead (Pb), or alloys thereof.

[0130] It should be understood that the light-emitting layer can confine excitons generated by holes and electrons in the light-emitting layer to emit light. The material of the light-emitting layer is not specifically limited here. For example, the material of the light-emitting layer can include a single material or a mixture of two or more materials. For example, when the light-emitting layer includes a host material and a guest material, the guest material is doped in the host material.

[0131] As an example, the material of the light-emitting layer may include a blue light-emitting material, a green light-emitting material, and a red light-emitting material. Among them, the blue light-emitting material may include a pyrene derivative, an anthracene derivative, a fluorene derivative, a perylene derivative, a styrylamine derivative, a metal complex, etc. For example, the blue light-emitting material may be N1, N6-di([1, 1'-biphenyl]-2-yl)-N1, N6-di([1, 1'-biphenyl]-4-yl)pyrene-1, 6-diamine; ADN, the Chinese name of ADN is 9, 10-di-(2-naphthyl)anthracene; MADN, the Chinese name of MADN is 2-methyl-9, 10-di-2-naphthylanthracene; TBPe, the Chinese name of TBPe is 2, 5, 8, 11-tetra-tert-butylperylene;

[0132] BDAVBi, the Chinese name of BDAVBi is 4,4'-bis[4-(diphenylamino)phenylvinyl]biphenyl; DPAVBi, the Chinese name of DPAVBi is 4,4'-bis[4-(di-p-tolylamino)phenylvinyl]biphenyl; FIrpic, the Chinese name of FIrpic is bis(4,6-difluorophenylpyridine-C2,N)picolinyliridium.

[0133] Green luminescent materials may include coumarin dyes, quinacridone copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, carbazole derivatives, metal complexes, etc. For example, the green luminescent material may be C-6, the Chinese name of C-6 is coumarin 6; C-525T, the Chinese name of C-525T is coumarin 545T; QA, the Chinese name of QA is quinacridone copper; DMQA, the Chinese name of DMQA is N,N'-dimethylquinacridone; DPT, the Chinese name of DPT is 5,12-diphenylnaphthonaphthalene; BA-NPB, the Chinese name of BA-NPB is N10,N10'- Diphenyl-N10,N10'-diphthaloyl-9,9'-dianthracene-10,10'-diamine; Alq3, the Chinese name of Alq3 is tris(8-hydroxyquinoline)aluminum(III); Ir(ppy)3, the Chinese name of Ir(ppy)3 is tris(2-phenylpyridine)iridium; Ir(ppy)2(acac), the Chinese name of Ir(ppy)2(acac) is di(2-phenylpyridine)iridium acetylacetonate.

[0134] The red light-emitting material may include a DCM series material, a metal complex, etc. For example, the red light-emitting material may be DCM, the Chinese name of DCM is 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminophenyl)-4H-pyran; DCJTB, the Chinese name of DCJTB is 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulonitrile-9-enyl)-4H-pyran; Ir(piq)2(acac), the Chinese name of Ir(piq)2(acac) is bis(1-phenylisoquinoline)(acetylacetonate)iridium(III);

[0135] PtOEP, the Chinese name of PtOEP is octaethylporphyrin platinum; Ir(btp)2(acac), the Chinese name of Ir(btp)2(acac) is bis(2-(2'-benzothienyl)pyridine-N,C3')(acetylacetonate)iridium, etc.

[0136] As another example, when the light-emitting layer includes a host material and a guest material, the light-emitting layer may include an electronic host material, a hole host material, and a guest material. The electronic host material is an organic semiconductor material that can achieve directional, orderly, and controllable migration of carriers under the action of an electric field when electrons are injected to achieve charge transport. The electronic host material is not specifically limited. For example, the electronic host material can be a nitrogen-containing heterocyclic compound or a cyano-containing aromatic heterocyclic compound, for example, a thermally activated delayed fluorescence material (TADF).

[0137] Hole-type host materials are organic semiconductor materials that, when holes are injected, can achieve controlled, directional, and orderly migration of charge carriers under the action of an electric field, thereby transporting charge. Hole-type host materials are not specifically limited; illustratively, they can be any of TCP, CBP, and mCP. TCP stands for tricresyl phosphate; CBP stands for 4,4'-bis(9-carbazole)biphenyl; and mCP stands for methylcyclopentenolone.

[0138] The guest material is not specifically limited here. For example, the guest material can be any one of Ir(ppy)3, Be(PP)2, and PPF. Here, the Chinese name of Be(PP)2 is bis(2-hydroxyphenylpyridine); the Chinese name of PPF is dibenzo[b,d]furan-2,8-diylbis(diphenylphosphine oxide).

[0139] The aforementioned light-emitting layer can be any one of a red (R), a green (G), or a blue (B) light-emitting layer. In this case, the light-emitting layer can be used to emit light of a single color. A light-emitting device can include all three light-emitting layers: a red light-emitting layer, a green light-emitting layer, or a blue light-emitting layer. Of course, it can also include only one type of light-emitting layer, for example, including only multiple red light-emitting layers, only multiple green light-emitting layers, or only multiple blue light-emitting layers. The specific structure can be determined based on actual requirements. For example, when the light-emitting layer is a red light-emitting layer, the red light-emitting layer can include a hole-type host material, an electron-type host material, and a red-emitting guest material.

[0140] The light-emitting device provided in the embodiments of the present application includes a hole transport layer, which is composed of a mixture of a left-handed chiral light-emitting material and a right-handed chiral light-emitting material. The polarization direction of the polarized light converted from the first polarized light or the second polarized light after passing through the quarter-wave plate is the same as the transmission axis direction of the linear polarizer. As a result, the light emitted from the RGB colors is polarized together after passing through the circular polarizer, and directly passes through the circular polarizer with the same polarization angle to generate the same circular polarization angle, and the glum is small and the CPL signal is strong, thereby effectively improving the luminous efficiency of the circularly polarized light-emitting device.

[0141] Alternatively, as an implementable approach, Figure 4 As shown, the light emitting device 02 includes an anode 1 and a hole injection layer 2, a hole transport layer 3, an electron blocking layer 4, a light emitting layer 5, a hole blocking layer 7, an electron transport layer 8, an electron injection layer 9, a cathode 10 and a circular polarizer 11, which are sequentially stacked on the anode 1. The circular polarizer 11 includes a quarter wave plate ( Figure 3 Not shown) and a linear polarizer ( Figure 3 (not shown), a quarter wave plate is provided between the cathode 10 and the linear polarizer.

[0142] It should be understood that the hole injection layer can inject the holes injected by the anode into the light-emitting layer. There is no specific limitation on the material of the hole injection layer. For example, the hole injection layer can be composed of a single-component material, for example, any one of HATCN, CuPc, MoO3, m-MTDATA, etc., where the Chinese name of HATCN is 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene, the Chinese name of CuPc is copper phthalocyanine, the Chinese name of MoO3 is molybdenum trioxide, and the Chinese name of m-MTDATA is 4,4′,4″-tris[phenyl(m-tolyl)amino]triphenylamine; or, the hole injection layer It can be composed of multi-component materials, for example, it can be a cyclic olefin or quinone compound doped with an aromatic amine compound. For example, the multi-component material can be F4TCNQ doped with NPB or TPD, where the Chinese name of F4TCNQ is 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, the Chinese name of NPB is N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, and the Chinese name of TPD is N,N'-diphenyl-N,N'-di(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine.

[0143] It should be understood that the above-mentioned electron blocking layer can block the electrons in the light-emitting layer from passing through the light-emitting layer, ensuring that more electrons recombine with holes in the light-emitting layer, thereby increasing the number of excitons and thus improving the luminous efficiency. The material of the electron blocking layer is not specifically limited. The material of the electron blocking layer can be a substance with hole transport properties, for example, any one of aromatic amine compounds, dimethylfluorene, carbazole materials and derivatives thereof, and exemplary, the material of the electron blocking layer can be mCP, CCP, Tris-PCz, etc., where the Chinese name of mCP is methylcyclopentenolone, the Chinese name of CCP is cyclic citrullinated peptide, and the Chinese name of Tris-PCz is 9-phenyl-3,6-bis(9-phenyl-9H carbazole-3-yl)-9H-carbazole.

[0144] It should be understood that the electron injection layer can inject electrons injected from the cathode into the light-emitting layer. The material of the electron injection layer is not specifically limited. Exemplary materials of the electron injection layer may include alkali metals or metals, such as LiF, Yb, Liq, Mg, Ca, etc., where LiF is lithium fluoride in Chinese, Yb is ytterbium in Chinese, Liq is 8-hydroxyquinoline-lithium in Chinese, Mg is magnesium in Chinese, and Ca is calcium in Chinese.

[0145] It should be understood that the above-mentioned electron transport layer is capable of transporting electrons and can inject the electrons injected by the cathode into the light-emitting layer. The material of the electron transport layer is not specifically limited. The material of the electron transport layer can be an aromatic heterocyclic compound, for example, benzimidazole, triazine, pyrimidine, pyridine, pyrazine, quinoxaline, quinoline, diazole, diazaphosphorus heterocyclopentadiene, phosphine oxide, aromatic ketone, lactam, borane compound and its derivatives, etc. Any one or a combination of two or more, exemplary, the material of the electron transport layer can be BCP, Bphen, TPBI, etc., where the Chinese name of BCP is 2,9-dimethyl-4,7-biphenyl-1,10-phenanthroline, the Chinese name of Bphen is red phenanthroline, and the Chinese name of TPBI is 1,3,5-tris (1-phenyl-1H-benzimidazole-2-yl) benzene.

[0146] It should be understood that the hole blocking layer can block holes in the light-emitting layer from passing through the light-emitting layer, ensuring that more holes recombine with electrons in the light-emitting layer, thereby increasing the number of excitons and further improving the luminous efficiency. The material of the hole blocking layer is not specifically limited. Exemplarily, the material of the hole blocking layer can be an aromatic heterocyclic compound, for example, an imidazole derivative such as a benzimidazole derivative, an imidazopyridine derivative, or a benzimidazolophenanthridine derivative, an azine derivative such as a pyrimidine derivative or a triazine derivative, a quinoline derivative, an isoquinoline derivative, a phenanthroline derivative, or a compound having a nitrogen-containing six-membered ring structure (including compounds having a phosphine oxide-based substituent on the heterocyclic ring). For example, the material of the electron transport layer can be PBD, OXD-7, TAZ, p-EtTAZ, BPhen, BCP, BzOs, BAlq, where the Chinese name of PBD is 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), the Chinese name of OXD-7 is 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazole-2-yl]benzene, and the Chinese name of TAZ is 3-(4-tert-butylphenyl)-1,3,4-oxadiazole-2-yl]benzene. The Chinese name of p-EtTAZ is 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenyl)-1,2,4-triazole, the Chinese name of BzOs is 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene, and the Chinese name of BAlq is bis(2-methyl-8-hydroxyquinoline-N1,O8)-(1,1'-biphenyl-4-hydroxy)aluminum.

[0147] The light-emitting device provided in the embodiment of the present application can effectively improve the luminous efficiency of the circularly polarized light-emitting device while having better performance through the combination of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer.

[0148] Please combine the following Figures 5 to 9, the second light-emitting device 02 provided in the embodiment of the present application is described in detail.

[0149] like Figure 5 and Figure 6 As shown, the light-emitting device 02 provided in the embodiment of the present application includes: a glass substrate 13 and an anode 1, a hole transport layer 3, a light-emitting layer 5, a cathode 10 and a color filter layer 12 stacked in sequence on the glass substrate 13, and power is passed between the anode 1 and the cathode 10 to generate an electric field.

[0150] Among them, Figures 7 to 9 As shown, the hole transport layer 3 includes a plurality of hole transport parts arranged in an array, with adjacent hole transport parts being independently arranged and having gaps between adjacent hole transport parts. All hole transport parts are arranged in multiple rows and columns, and the chiral luminescent material in two adjacent rows of hole transport parts and / or two adjacent columns of hole transport parts is either a first chiral luminescent material or a second chiral luminescent material. Thus, the entire hole transport layer 3 is composed of a first chiral luminescent material having a first chiral structure and a second chiral luminescent material having a second chiral structure. The chirality of the first chiral structure is opposite to that of the second chiral structure, and the luminescence asymmetry factor glum of the hole transport layer 3 satisfies: glum = 2×|I S -I R | / |I S +I R |≥1E -2 , where I S represents the intensity of the first polarized light emitted by the light-emitting device due to the hole transport layer composed of the first chiral light-emitting material, I R It represents the intensity of the second polarized light emitted by the light-emitting device due to the hole transport layer composed of the second chiral light-emitting material. The rotation directions of the first polarized light and the second polarized light are opposite.

[0151] Furthermore, Figure 6 As shown, the light-emitting device 02 also includes a hole injection layer 2, an electron blocking layer 4, a hole blocking layer 7, an electron transport layer 8 and an electron injection layer 9. The hole injection layer 2 is arranged between the anode 1 and the hole transport layer 3, the electron blocking layer 4 is arranged between the hole transport layer 3 and the light-emitting layer 5, the hole blocking layer 7 is arranged between the light-emitting layer 5 and the electron transport layer 8, the electron transport layer 8 is arranged between the hole blocking layer 7 and the electron injection layer 9, and the electron injection layer 9 is arranged between the electron transport layer 8 and the cathode 10.

[0152] It should be noted that the first chiral light-emitting material, second chiral light-emitting material, anode, hole transport layer, light-emitting layer, cathode, hole injection layer, electron blocking layer, hole blocking layer, electron transport layer and electron injection layer in the embodiments of the present application can all refer to the above embodiments and will not be repeated here.

[0153] In applications, the structure of the color filter layer is not specifically limited. For example, the color filter layer may include a black matrix and a plurality of color filter units arranged in an array. The plurality of color filter units are spaced apart, and the black matrix is ​​disposed between all the color filter units. The color filter units may include a first color filter unit, a second color filter unit, and a third color filter unit. The first color filter unit may be a red color filter unit, the second color filter unit may be a green color filter unit, and the third color filter unit may be a blue color filter unit. Of course, the color filter units may also be any other color, depending on the actual application. The following embodiments are all described using the color filter unit as at least one of a red color filter unit, a green color filter unit, or a blue color filter unit.

[0154] The color filter layer can include three color filter units of red, green or blue at the same time; of course, it can also include only one color of color filter unit, for example, only multiple red color filter units, or only multiple green color filter units, or only multiple blue color filter units, which can be determined according to actual requirements. Figure 5 and Figure 6 The color filter layer 12 includes a black matrix H and a plurality of color filter units arranged in an array. The plurality of color filter units are arranged at intervals, the black matrix H is arranged between all the color filter units, and the color filter units include a red color filter unit 121, a green color filter unit 122 and a blue color filter unit 123.

[0155] It should be noted that if Figures 7 to 9 As shown, the hole transport portion R represents that it corresponds to the red color filter unit 121, the hole transport portion G represents that it corresponds to the green color filter unit 122, and the hole transport portion B represents that it corresponds to the blue color filter unit 123. In addition, S-NPAPD in the hole transport portion indicates that the hole transport portion is composed of a left-handed chiral luminescent material, and R-NPAPD indicates that the hole transport portion is composed of a right-handed chiral luminescent material.

[0156] The light-emitting device provided in the embodiment of the present application includes a hole transport layer, in which a plurality of discrete and spaced hole transport portions are respectively composed of a first chiral light-emitting material or a second chiral light-emitting material. As a result, the hole transport layer comprises a first chiral light-emitting material and a second chiral light-emitting material. The chirality of the chiral light-emitting material affects the polarization of the light emitted by the light-emitting layer. For example, light of opposite chirality causes the emitted light to rotate in different directions, generating left-handed circularly polarized light and right-handed circularly polarized light. As a result, the light emitted by each sub-pixel is circularly polarized light, and the glum is small, the CPL signal is strong, and the luminous efficiency of the circularly polarized light-emitting device is effectively improved. On this basis, when not paired with polarized glasses, the light-emitting device can achieve 2D display, and when paired with polarized glasses, it can achieve 3D display without the need for additional image processing.

[0157] Alternatively, as an implementable approach, Figure 7 As shown, the hole transport layer 3 includes a plurality of hole transport portions R, a plurality of hole transport portions G and a plurality of hole transport portions B arranged in an array, and all the hole transport portions are arranged along a first direction ( Figure 7 OX direction in the second direction ( Figure 7 The hole transport parts are arranged in the OY direction), the OX direction is perpendicular to the OY direction, adjacent hole transport parts are independently arranged, and there is a gap between adjacent hole transport parts; in each column, the chiral structures of the chiral light-emitting materials in the hole transport parts of two adjacent rows are different.

[0158] It should be understood that in each column, the different chiral structures of the chiral light-emitting materials in the hole transport parts of two adjacent rows mean that: in the same column, when the chiral light-emitting material in the hole transport part of the previous row is a first chiral light-emitting material, the chiral light-emitting material in the hole transport part of the next row is a second chiral light-emitting material; or, when the chiral light-emitting material in the hole transport part of the previous row is a second chiral light-emitting material, the chiral light-emitting material in the hole transport part of the next row is a first chiral light-emitting material, the specific details shall be subject to actual application.

[0159] like Figure 7 As shown in the figure, all the hole transport parts are divided into three rows and four columns along the OX direction and the OY direction. In the first row, the hole transport parts in the first column, the hole transport parts in the second column and the hole transport parts in the third column are all composed of R-NPAPD, and the hole transport parts in the fourth column are composed of S-NPAPD; in the second row, the hole transport parts in the first column, the hole transport parts in the second column and the hole transport parts in the third column are all composed of S-NPAPD, and the hole transport parts in the fourth column are composed of R-NPAPD; in the third row, the hole transport parts in the first column, the hole transport parts in the second column and the hole transport parts in the third column are all composed of R-NPAPD, and the hole transport parts in the fourth column are composed of S-NPAPD.

[0160] It should be noted that in Figure 7 In the embodiment, the areas of all hole transporting portions may be the same.

[0161] In the light-emitting device provided in the embodiment of the present application, a plurality of discrete and spaced-apart hole transport portions in the hole transport layer are respectively composed of a first chiral light-emitting material or a second chiral light-emitting material. Since the chiral structure of the first chiral light-emitting material is opposite to the chiral structure of the second chiral light-emitting material, the light emitted by the light-emitting layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is high. In addition, 3D display can be achieved when used with polarized glasses.

[0162] Alternatively, as an implementable approach, Figure 8As shown, the hole transport layer 3 includes a plurality of hole transport portions R, a plurality of hole transport portions G and a plurality of hole transport portions B, all of the hole transport portions R and all of the hole transport portions B are arranged along a first direction ( Figure 8 OX direction shown) and the second direction ( Figure 8 In the embodiment, the plurality of first rows 112 and the plurality of second columns 114 are arranged alternately along the OX direction and staggered in the OX direction, and the plurality of first columns 115 and the plurality of second columns 114 are arranged alternately along the OY direction and staggered in the OY direction, wherein the OX direction is perpendicular to the OY direction; in each row, the chiral structures of the chiral light-emitting materials in the hole transport parts of adjacent columns are different.

[0163] like Figure 8 As shown, all hole transport parts are divided into two first rows 112 and three second rows 113 along the OX direction, and all hole transport parts are divided into two first columns 115 and three second columns 114 along the OY direction. In the first first row, the hole transport parts are respectively composed of R-NPAPD, S-NPAPD, and R-NPAPD; in the first second row, the hole transport parts are respectively composed of R-NPAPD and S-NPAPD; in the second first row, the hole transport parts are respectively composed of S-NPAPD, R-NPAPD, and S-NPAPD; in the second second row, the hole transport parts are respectively composed of R-NPAPD and S-NPAPD; in the third first row, the hole transport parts are respectively composed of R-NPAPD, S-NPAPD, and R-NPAPD.

[0164] It should be noted that in Figure 8 In the embodiment, the area of ​​the hole transport portion B is larger than the area of ​​the hole transport portion R and the area of ​​the hole transport portion G, respectively, and the area of ​​the hole transport portion R and the area of ​​the hole transport portion G can be the same or different.

[0165] In the light-emitting device provided in the embodiment of the present application, a plurality of discrete and spaced-apart hole transport portions in the hole transport layer are respectively composed of a first chiral light-emitting material or a second chiral light-emitting material. Since the chiral structure of the first chiral light-emitting material is opposite to the chiral structure of the second chiral light-emitting material, the light emitted by the light-emitting layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is high. In addition, 3D display can be achieved when used with polarized glasses.

[0166] Alternatively, as an implementable approach, Figure 9As shown, the hole transport layer 3 includes a plurality of hole transport parts, all of which are a plurality of hole transport part groups arranged in an array, each hole transport part group includes a hole transport part R, a hole transport part G and a hole transport part B, and in each hole transport part group, the hole transport part R, the hole transport part G and the hole transport part B are arranged along the first direction ( Figure 9 The hole transport portion R and the hole transport portion G are arranged in the second direction ( Figure 9 The chiral structures of the chiral light-emitting materials in the hole transport part R, the chiral structure of the chiral light-emitting materials in the hole transport part G, and the chiral structure of the chiral light-emitting materials in the hole transport part B are the same, the chiral structures of the chiral light-emitting materials in the hole transport part groups in adjacent rows are different, and the chiral structures of the chiral light-emitting materials in the hole transport part groups in adjacent columns are different.

[0167] like Figure 9 As shown, all hole transport portions are divided into a first hole transport portion group 116 and a second hole transport portion group 117 in the first row, and a third hole transport portion group 118 and a fourth hole transport portion group 119 in the second row along the OX direction. All hole transport portions in the first hole transport portion group 116 and the fourth hole transport portion group 119 are composed of R-NPAPD, and all hole transport portions in the second hole transport portion group 117 and the third hole transport portion group 118 are composed of S-NPAPD.

[0168] It should be noted that in Figure 9 In the embodiment, the area of ​​the hole transport portion B is larger than the area of ​​the hole transport portion R and the area of ​​the hole transport portion G, respectively, and the area of ​​the hole transport portion R and the area of ​​the hole transport portion G can be the same or different.

[0169] In the light-emitting device provided in the embodiment of the present application, a plurality of discrete and spaced-apart hole transport portions in the hole transport layer are respectively composed of a first chiral light-emitting material or a second chiral light-emitting material. Since the chiral structure of the first chiral light-emitting material is opposite to the chiral structure of the second chiral light-emitting material, the light emitted by the light-emitting layer will produce left-handed circularly polarized light and right-handed circularly polarized light, so that the light emitted by each sub-pixel is circularly polarized light, the glum is small, and the luminous efficiency is high. In addition, 3D display can be achieved when used with polarized glasses.

[0170] Specific examples are provided below to illustrate the improvement effects.

[0171] The prepared ITO substrate (material used as anode) was cleaned and dried; HATCN (material used as hole injection layer) and (mixed material used as hole transport layer), mCP (material used as electron blocking layer), DCM (used as red light-emitting layer), PBD (material used as hole blocking layer), BCP (material used as electron transport layer), LiF (material used as electron injection layer), Al (material used as cathode), circular polarizer, to obtain the first light-emitting device.

[0172] In the hole transport layer of the first light-emitting device, R1 and R2 in the general structure of the first chiral light-emitting material are replaced with diphenylamine, and R3 and R4 in the general structure of the second chiral light-emitting material are replaced with diphenylamine to obtain a second light-emitting device.

[0173] In the hole transport layer of the first light-emitting device, R1 and R2 in the first chiral light-emitting material structure formula are replaced with N-phenylcarbazole, and R3 and R4 in the second chiral light-emitting material structure formula are replaced with N-phenylcarbazole to obtain a third light-emitting device.

[0174] In the hole transport layer of the first light-emitting device, R1 and R2 in the first chiral light-emitting material structure formula are replaced with triphenylamine, and R3 and R4 in the second chiral light-emitting material structure formula are replaced with triphenylamine, thereby obtaining a fourth light-emitting device.

[0175] The first light emitting device, the second light emitting device, the third light emitting device and the fourth light emitting device were tested respectively to obtain the voltage, luminous peak, luminous efficiency, lifespan, etc. of each light emitting device, as shown in Table 1 below.

[0176] Table 1

[0177]

[0178]

[0179] It should be noted that the V turn-on Represents the light-emitting device's turn-on voltage, L max Represents the maximum brightness that the light-emitting device can illuminate, λ EL represents the wavelength of the light emitting device, FWHM represents the half-maximum width of the emission of the light emitting device, η max It represents the luminous efficiency of the light-emitting device, and EQE represents the external quantum efficiency of the light-emitting device.

[0180] It can be concluded from Table 1 that the glum values ​​of the first to fourth light-emitting devices are relatively small, and the luminous efficiency is relatively high.

[0181] The light-emitting device in the embodiment of the present application can be applied to a display device, and the specific structure of the display device is not limited here.

[0182] Exemplarily, a display device may include a display substrate and a light-emitting device. The display substrate includes a plurality of pixel units arranged in an array, and the light-emitting device includes a red light-emitting device, a green light-emitting device, and a blue light-emitting device arranged in an array. Each pixel unit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the red sub-pixel is electrically connected to the red light-emitting device, the green sub-pixel is electrically connected to the green light-emitting device, and the blue sub-pixel is electrically connected to the blue light-emitting device.

[0183] refer to Figure 10 As shown, the red sub-pixel in display device 03 is electrically connected to the red light-emitting device 200, the green sub-pixel is electrically connected to the green light-emitting device 300, and the blue sub-pixel is electrically connected to the blue light-emitting device 400. Taking the red sub-pixel located at the far left as an example to illustrate the specific structure, the red sub-pixel includes: a buffer layer 501, an active layer 502, a gate insulating layer 503, a gate metal layer (including a gate 504 and a first electrode 505), an insulating layer 506, an electrode layer (including a second electrode 507), an interlayer dielectric layer 508, a source-drain metal layer (including a source electrode 509 and a drain electrode 510), a planarization layer 511, and a pixel defining layer 512, which are stacked in sequence on a substrate 500. The first electrode 505 and the second electrode 507 are used to form a storage capacitor. The pixel defining layer 512 includes an opening, within which the red light-emitting device 200 is disposed. The anode 1 of the red light-emitting device 200 is electrically connected to the drain electrode 510 of the thin film transistor. The display substrate also includes a spacer 513 located above the pixel defining layer 512. It should be noted that, in the display substrate, spacers may be provided on part of the pixel defining layer or on the entire pixel defining layer, which is not limited here.

[0184] The red light-emitting device 200 includes an anode 1, and a hole injection layer 2, a hole transport layer 3, an electron blocking layer 4, a light-emitting layer 5, a hole blocking layer 7, an electron transport layer 8, an electron injection layer 9, and a cathode 10 stacked in sequence on the anode 1.

[0185] In addition, if Figure 10 As shown, the display device 03 may further include a first inorganic layer 421, an organic layer 43 and a second inorganic layer 422 covering the light-emitting device. The first inorganic layer 421, the organic layer 43 and the second inorganic layer 422 may act as an encapsulation layer to protect the light-emitting device and extend its service life.

[0186] It should be noted that Figure 10The light-emitting layers of the green and blue light-emitting devices 300 and 400 shown are made of different materials than the light-emitting layer of the red light-emitting device 200. The light-emitting layer of the green light-emitting device is designed to emit green light, the light-emitting layer of the blue light-emitting device is designed to emit blue light, and the light-emitting layer of the red light-emitting device is designed to emit red light. Furthermore, the electron blocking layers of the green and blue light-emitting devices are made of different materials than the electron blocking layers of the red light-emitting device. Aside from the light-emitting layer and electron blocking layer, the other layers of the green and blue light-emitting devices are the same as those of the red light-emitting device and are not further described here.

[0187] An embodiment of the present application further provides a display device comprising the above-mentioned light-emitting device.

[0188] Figure 11 and Figure 12 The circularly polarized electroluminescence characteristics (CPEL) and glum schematic diagram of a red light-emitting device at a specific wavelength (Wavelength) are shown respectively.

[0189] Figure 13 and Figure 14 The circularly polarized electroluminescence characteristics (CPEL) and glum schematic diagram of a green light-emitting device at a specific wavelength (Wavelength) are shown respectively.

[0190] Figure 15 and Figure 16 The circularly polarized electroluminescence characteristics (CPEL) and glum schematic diagram of a blue light-emitting device at a specific wavelength (Wavelength) are shown respectively.

[0191] Depend on Figures 11 to 16 It can be seen that glum max When ≈0.005, the efficiency of the light-emitting device will be improved by about 1%, thereby bringing about a 1% power consumption benefit.

[0192] The above-mentioned display device can be a flexible display device (also known as a flexible screen) or a rigid display device (i.e., a display screen that cannot be bent), and there is no limitation here. The above-mentioned display device can be an OLED display device. The above-mentioned display device can be any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, etc.; the above-mentioned display device can also be used in the fields of identity recognition, medical equipment, etc. Products that have been promoted or have good promotion prospects include security identity authentication, smart door locks, medical image acquisition, etc. The display device has the advantages of high luminous efficiency, high stability, long life, good display effect, high contrast, good imaging quality, and high product quality.

[0193] It should be understood that the above is only intended to help those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Based on the above examples, those skilled in the art can obviously make various equivalent modifications or changes. For example, certain steps in each embodiment of the method may be non-essential, or certain new steps may be added; or a combination of any two or more of the above embodiments. Such modifications, changes, or combinations also fall within the scope of the embodiments of the present application.

[0194] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced with each other. For the sake of brevity, they will not be repeated here.

[0195] It should also be understood that the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0196] It should also be understood that the division of the modes, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various modes, categories, situations and embodiments can be combined without contradiction.

[0197] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0198] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A light emitting device, characterized in that: comprising a hole transport layer, the hole transport layer comprising a first chiral light-emitting material having a first chiral structure and a second chiral light-emitting material having a second chiral structure, the chirality of the first chiral structure being opposite to the chirality of the second chiral structure, and the light-emitting device emitting circularly polarized light; The luminescence asymmetry factor glum of the hole transport layer satisfies: glum=2×|I S -I R | / |I S +I R |≥1E -2 ; Among them, I S represents the intensity of the first polarized light emitted by the light-emitting device due to the hole transport layer composed of the first chiral light-emitting material, I R represents the intensity of the second polarized light emitted by the light-emitting device due to the hole transport layer composed of the second chiral light-emitting material, wherein the rotation directions of the first polarized light and the second polarized light are opposite; The general structural formula of the first chiral luminescent material is: The general structural formula of the first chiral luminescent material has a first spatial configuration, the R1 group is located above the entire molecule in the first spatial configuration, and the group connected to the benzene ring of the R2 group is located above the entire molecule in the first spatial configuration; in, for Any of; R1 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine; R2 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine; The general structural formula of the second chiral luminescent material is: The general structural formula of the second chiral luminescent material has a second spatial configuration, the group connected to the benzene ring of the R3 group is located above the entire molecule in the second spatial configuration, and the R4 group is located above the entire molecule in the second spatial configuration; in, for Any of; R3 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine; R4 is any one of carbazole, diphenylamine, N-phenylcarbazole and triphenylamine.

2. The light emitting device according to claim 1, wherein The chemical structural formula of the first chiral luminescent material includes:

3. The light emitting device according to claim 1, wherein The chemical structural formula of the second chiral luminescent material includes:

4. The light emitting device according to any one of claims 1 to 3, characterized in that The light-emitting device further comprises an anode, a light-emitting layer, a cathode and a circular polarizer, wherein the anode is arranged on one side of the hole transport layer, the light-emitting layer is arranged on a side of the hole transport layer away from the anode, the cathode is arranged on a side of the light-emitting layer away from the hole transport layer, and the circular polarizer is arranged on a side of the cathode away from the light-emitting layer; The circular polarizer includes a quarter wave plate and a linear polarizer, and the quarter wave plate is arranged between the cathode and the linear polarizer; The hole transport layer is formed by mixing the first chiral luminescent material and the second chiral luminescent material. The polarization direction of the polarized light converted from the first polarized light or the second polarized light after passing through the quarter-wave plate is the same as the transmission axis direction of the linear polarizer.

5. The light emitting device according to any one of claims 1 to 3, characterized in that The light-emitting device further comprises an anode, a light-emitting layer, a cathode and a color filter layer, wherein the anode is arranged on one side of the hole transport layer, the light-emitting layer is arranged on a side of the hole transport layer away from the anode, the cathode is arranged on a side of the light-emitting layer away from the hole transport layer, and the color filter layer is arranged on a side of the cathode away from the light-emitting layer; The hole transport layer includes multiple hole transport parts, adjacent hole transport parts are separated and spaced apart, all hole transport parts are arranged in multiple rows and columns, and the chiral light-emitting material in the hole transport parts of two adjacent rows and / or two adjacent columns is any one of the first chiral light-emitting material or the second chiral light-emitting material.

6. The light emitting device according to claim 5, characterized in that The plurality of hole transporting parts are arranged in an array, and in each column, the chiral structures of the chiral light-emitting materials in the hole transporting parts of two adjacent rows are different.

7. The light emitting device according to claim 6, characterized in that The plurality of hole transport portions are arranged in three rows and four columns; In the first row, the hole transport portion in the first column, the hole transport portion in the second column, and the hole transport portion in the third column are all composed of the second chiral light-emitting material, and the hole transport portion in the fourth column is composed of the first chiral light-emitting material; In the second row, the hole transport portion in the first column, the hole transport portion in the second column, and the hole transport portion in the third column are all composed of the first chiral light-emitting material, and the hole transport portion in the fourth column is composed of the second chiral light-emitting material; In the third row, the hole transporting parts in the first column, the second column and the third column are all composed of the first chiral light-emitting material, and the hole transporting part in the fourth column is composed of the second chiral light-emitting material.

8. The light emitting device according to claim 5, characterized in that The plurality of hole transport portions include a first hole transport portion, a second hole transport portion, and a third hole transport portion, all of the first hole transport portions and all of the third hole transport portions are alternately arranged along a first direction and a second direction to form a plurality of first rows and a plurality of first columns, all of the second hole transport portions are arrayed along the first direction and the second direction to form a plurality of second rows and a plurality of second columns, a plurality of the first rows and a plurality of the second rows are alternately arranged along the second direction and staggered in the first direction, a plurality of the first columns and a plurality of the second columns are alternately arranged along the first direction and staggered in the second direction, wherein the first direction is perpendicular to the second direction; In each row, the chiral structures of the chiral light-emitting materials in the hole transporting portions of adjacent columns are different.

9. The light emitting device according to claim 8, characterized in that The plurality of hole transport portions are divided into two first rows and three second rows along the first direction, and the plurality of hole transport portions are divided into two first columns and three second columns along the second direction; In the first first row, the hole transport portion is composed of the second chiral light-emitting material, the first chiral light-emitting material, and the second chiral light-emitting material respectively; In the first second row, the hole transport portion is composed of the second chiral light-emitting material and the first chiral light-emitting material respectively; In the second first row, the hole transport portion is composed of the first chiral light-emitting material, the second chiral light-emitting material, and the first chiral light-emitting material respectively; In the second second row, the hole transport portion is composed of the second chiral light-emitting material and the first chiral light-emitting material respectively; In the third first row, the hole transport portion is composed of the second chiral light-emitting material, the first chiral light-emitting material, and the second chiral light-emitting material, respectively.

10. The light emitting device according to claim 5, characterized in that The plurality of hole transport portions include a plurality of hole transport portion groups arranged in an array, each hole transport portion group includes a first hole transport portion, a second hole transport portion, and a third hole transport portion, and in each of the hole transport portion groups, the first hole transport portion, the second hole transport portion, and the third hole transport portion are all arranged along a first direction, and the first hole transport portion and the second hole transport portion are also arranged along a second direction, wherein the first direction is perpendicular to the second direction; In each of the hole transport unit groups, the chiral light-emitting materials of all hole transport units have the same chiral structure, the chiral light-emitting materials of the hole transport units in the hole transport unit groups in adjacent rows have different chiral structures, and the chiral light-emitting materials of the hole transport units in the hole transport unit groups in adjacent columns have different chiral structures.

11. The light emitting device according to claim 10, characterized in that The multiple hole transport parts are divided into a first hole transport part group and a second hole transport part group in a first row, and a third hole transport part group and a fourth hole transport part group in a second row along the first direction. All the hole transport parts in the first hole transport part group and the fourth hole transport part group are composed of the second chiral light-emitting material, and all the hole transport parts in the second hole transport part group and the third hole transport part group are composed of the first chiral light-emitting material.

12. The light emitting device according to any one of claims 8 to 11, characterized in that The area of ​​the orthographic projection of the third hole transport portion on the anode is larger than the area of ​​the orthographic projection of the first hole transport portion on the anode and the area of ​​the orthographic projection of the second hole transport portion on the anode.

13. The light emitting device according to any one of claims 6 to 11, characterized in that The light-emitting device further includes a hole injection layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer, the hole injection layer is arranged between the anode and the hole transport layer, the electron blocking layer is arranged between the hole transport layer and the light-emitting layer, the hole blocking layer is arranged between the light-emitting layer and the electron transport layer, the electron transport layer is arranged between the hole blocking layer and the electron injection layer, and the electron injection layer is arranged between the electron transport layer and the cathode.

14. A display device, characterized in that: The light emitting device comprises the light emitting device according to any one of claims 1 to 13.

15. An electronic device, characterized in that: Comprising the display device as claimed in claim 14.

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