Functional layer material, light-emitting device, and display panel

Abstract

The embodiments of the present disclosure relate to the technical field of display, and provide a functional layer material, a light-emitting device, and a display panel, which are used for increasing the service life and light-emitting efficiency of a device and reducing the voltage of a light-emitting device. The functional layer material is selected from any one of the structures shown in general formula (I). IA represents a first substitution unit, comprising at least one fused ring aryl group; X is selected from any one of O, S and Se; Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond; L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 arylene group, a substituted or unsubstituted C7-C30 arylalkyl group and a substituted or unsubstituted C2-C30 heteroarylalkyl group; L2 is selected from any one of a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 arylene group, a substituted or unsubstituted C7-C30 arylalkyl group and a substituted or unsubstituted C2-C30 heteroarylalkyl group. The light-emitting device is used for displaying an image.

Description

Functional layer materials, light-emitting devices and display panels

[0001] This application claims priority to Chinese patent application No. 202310715885.2, filed on June 15, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of display technology, and in particular to a functional layer material, a light-emitting device, and a display panel. Background Art

[0003] Organic light-emitting diodes (OLEDs), with their advantages of self-luminescence and fast response speed, have become the most promising new light-emitting device in recent years. During the light-emitting process, holes from the anode and electrons from the cathode are emitted into the light-emitting layer included in the OLED device. These electrons and holes combine to form electron-hole pairs, which are then converted from a singlet state to a ground state to emit light.

[0004] Summary of the Invention

[0005] In one aspect, a functional layer material is provided, selected from any one of the structures represented by the following general formula (I).

[0006] Wherein, IA represents the first substitution unit, including at least one fused ring aromatic group; X is selected from any one of O, S and Se; Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond, and X and Y are the same or different; L1 is selected from a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group and a substituted or unsubstituted C2 ~C30 heteroarylalkylene; L2 is selected from any one of substituted or unsubstituted C6~C30 arylene, substituted or unsubstituted C1~C30 heteroarylene, substituted or unsubstituted C7~C30 arylalkylene and substituted or unsubstituted C2~C30 heteroarylalkylene; and L2 and L1 are the same or different; R1, R2, R4, R5 and R6 are the same or different and are independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, substituted or unsubstituted C6-C39 arylamino, substituted or unsubstituted C3-C39 cycloalkyl , substituted or unsubstituted C3~C39 heterocycloalkyl, substituted or unsubstituted C1~C39 alkylsilyl, substituted or unsubstituted C1~C39 alkylboryl, substituted or unsubstituted C6~C39 arylboryl, substituted or unsubstituted C6~C39 arylphosphinyl, substituted or unsubstituted C6~C39 arylsilyl; the value of n is a positive integer greater than or equal to 1; the value of q is a positive integer greater than or equal to 1.

[0007] In some embodiments, the functional layer material is selected from any one of the structures represented by the following general formula (II).

[0008] wherein L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L3 and L1 are the same or different, and L3 and L2 are the same or different; and R3 is selected from hydrogen, deuterium, a substituted or unsubstituted C1-C39 alkyl group, a substituted or unsubstituted C2-C39 alkenyl group, a substituted or unsubstituted C2-C39 alkynyl group, a substituted or unsubstituted C6-C39 aryl group, a substituted or unsubstituted C5-C60 heteroaryl group, alkyl, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C1-C39 alkoxy group, a substituted or unsubstituted C6-C39 arylamino group, a substituted or unsubstituted C3-C39 cycloalkyl group, a substituted or unsubstituted C3-C39 heterocycloalkyl group, a substituted or unsubstituted C1-C39 alkylsilyl group, a substituted or unsubstituted C1-C39 alkylboryl group, a substituted or unsubstituted C6-C39 arylboryl group, a substituted or unsubstituted C6-C39 arylphosphine group, or a substituted or unsubstituted C6-C39 arylsilyl group; and m is a positive integer greater than or equal to 1.

[0009] In other embodiments, X is oxygen and Y is a single bond; or, X is sulfur and Y is a single bond.

[0010] In yet other embodiments, X is oxygen and Y is oxygen; or, X is oxygen and Y is sulfur.

[0011] In some further embodiments, the functional layer material is selected from any one of the structures represented by the following general formula (III).

[0012] In some further embodiments, the functional layer material is selected from any one of the structures shown in the following general formula (IV).

[0013] In some other embodiments, when the functional layer material is selected from any one of the structures represented by general formula (I), the structure represented by general formula (I) contains at least one deuterium; or, when the functional layer material is selected from any one of the structures represented by general formula (II), the structure represented by general formula (II) contains at least one deuterium; or, when the functional layer material is selected from any one of the structures represented by general formula (III), the structure represented by general formula (III) contains at least one deuterium; or, when the functional layer material is selected from any one of the structures represented by general formula (IV), the structure represented by general formula (IV) contains at least one deuterium.

[0014] In some other embodiments, when m is greater than 2, two adjacent R3 groups can be bonded to form a ring.

[0015] In some other embodiments, when q is greater than 2, two adjacent R1s can be bonded to form a ring.

[0016] In some other embodiments, when n is greater than 2, two adjacent R2 groups can be bonded to form a ring.

[0017] In yet other embodiments, the functional layer material is used to transport holes and / or block electrons.

[0018] On the other hand, a light-emitting device is provided, comprising a cathode and an anode arranged opposite to each other, and at least one light-emitting unit arranged between the cathode and the anode; the light-emitting unit comprises: a light-emitting layer and a first type of functional layer arranged on the side of the light-emitting layer close to the anode; the material of the first type of functional layer comprises the functional layer material described in any of the above embodiments.

[0019] In some embodiments, the first type of functional layer includes a plurality of sub-functional layers, and at least one sub-functional layer of the plurality of sub-functional layers includes a functional layer material.

[0020] In other embodiments, the multiple sub-functional layers include an electron blocking functional layer, a hole injection functional layer and a hole transport functional layer that are stacked; the hole injection functional layer, the hole transport functional layer and the electron blocking functional layer are arranged in sequence along the direction away from the anode; among the hole injection functional layer, the hole transport functional layer and the electron blocking functional layer, at least the electron blocking functional layer includes a functional layer material.

[0021] In some other embodiments, the light-emitting layer is configured to emit blue light; the material of the light-emitting layer includes: a host material and a guest material; the structural formula of the host material is shown below.

[0022] The structural formula of the guest material is shown below.

[0023] On the other hand, a display panel is provided, comprising a plurality of light-emitting devices as described in any of the above embodiments; and further comprising: a pixel driving circuit electrically connected to the light-emitting devices, the pixel driving circuit being used to drive the light-emitting devices to emit light. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0025] FIG1 is a structural diagram of a light emitting device according to some embodiments of the present disclosure;

[0026] FIG2 is a structural diagram of a display panel provided according to some embodiments of the present disclosure;

[0027] FIG3 is another structural diagram of a display panel provided according to some embodiments of the present disclosure;

[0028] FIG4 is a structural diagram of a display device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0030] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0031] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0032] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0033] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0034] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0035] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0036] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0037] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0038] It should be noted that, for example, 1 / 2 in the drawings of this application represents structure 1 and structure 2, and both can refer to the structure shown. For example, 13211 / 1321 in FIG1 represents the hole injection functional layer 13211 and the sub-functional layer 1321, and both can refer to the structure shown. Other similar numbers appearing in the drawings also follow the above description.

[0039] As mentioned in the background, OLED technology is gaining increasing attention in academia and industry within the field of organic semiconductors, and has been successfully applied in commercial flat-panel displays and lighting. OLED light-emitting devices are self-luminous, and accordingly, OLED display panels and OLED light-emitting substrates require no backlight, resulting in thin panels and light weight. OLED light-emitting devices also offer the advantages of being fully solid-state, with fast response times and a wide operating temperature range.

[0040] The different compositions of the compounds used in the organic material layers of OLED light-emitting devices can significantly impact the overall performance of the devices. With the development of OLED light-emitting devices, the requirements for their efficiency, power consumption, lifespan, and other performance are becoming increasingly stringent. Existing organic materials are no longer able to meet these requirements.

[0041] Based on this, some embodiments of the present disclosure provide a functional layer material F, selected from any one of the structures shown in the following general formula (I).

[0042] Wherein, IA represents a first substituent unit, comprising at least one fused-ring aromatic group.

[0043] X is selected from any one of O, S and Se.

[0044] Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond, and X and Y are the same or different.

[0045] L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group.

[0046] L2 is selected from any one of a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L2 and L1 are the same or different.

[0047] R1, R2, R4, R5 and R6 are the same or different and are independently selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 substituted or unsubstituted C2~C39 alkyl, substituted or unsubstituted C2~C39 alkenyl, substituted or unsubstituted C2~C39 alkynyl, substituted or unsubstituted C6~C39 aryl, substituted or unsubstituted C5~C60 heteroaryl, substituted or unsubstituted C6~C60 aryloxy, substituted or unsubstituted C1~C39 alkoxy, substituted or unsubstituted C6~C39 arylamino, substituted or unsubstituted C3~C39 cycloalkyl, substituted or unsubstituted C3~C39 heterocycloalkyl, substituted or unsubstituted C1~C39 alkylsilyl, substituted or unsubstituted C1~C39 alkylboryl, substituted or unsubstituted C6~C39 arylboryl, substituted or unsubstituted C6~C39 arylphosphino, substituted or unsubstituted C6~C39 arylsilyl.

[0048] The value of n is a positive integer greater than or equal to 1.

[0049] The value of q is a positive integer greater than or equal to 1.

[0050] Exemplarily, the value of n can be any one of 1, 2, 3, 4, 5, 6, 7 and 8.

[0051] Exemplarily, the value of q can be any one of 1, 2, 3, 4, 5, 6 and 7.

[0052] Regarding the structure shown in general formula (I), the following points need to be explained:

[0053] The first substituent unit shown in IA includes at least one fused-ring aromatic group, which can be a naphthyl group, a phenanthrenyl group, etc. That is, the number of aromatic rings fused together in the fused-ring aromatic group can be 2, 3, or a positive integer greater than 3.

[0054] X is selected from any one of O, S and Se, wherein O is oxygen, S is sulfur, and Se is selenium.

[0055] Y is selected from any one of O, S, N(R4), C(R5R6) and a single bond. Wherein, O is oxygen; S is sulfur; N(R4) is nitrogen substituted by R4; C(R5R6) is R 5、 R6 substituted carbon, and R 5、 R6 can be the same or different. When Y is selected from a single bond, carbon 11 and carbon 12 of the IB portion are directly connected by a covalent bond.

[0056] L1 can be selected from a single bond, and when L1 is a single bond, the nitrogen and carbon number 1 of the IB moiety are directly linked by a covalent bond.

[0057] L1 and L2 can be selected from any one of a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group. Among them, the aryl group of Cx refers to an aryl group having x carbon (C) atoms, where x is a positive integer, and the same applies to the following. For the understanding of other groups such as Cx heteroaryl group and Cx aralkylene group, please refer to the above content and will not be repeated here. In addition, phenyl refers to the general term for the group remaining after the hydrogen atom of one carbon atom on the benzene ring is removed. Phenylene refers to the general term for the group remaining after the hydrogen atoms of two carbon atoms on the benzene ring are removed. For the understanding of other groups such as arylene group, heteroarylene group, alkylene group, etc., please refer to the above content and will not be repeated here.

[0058] It should be noted that an aryl group may be a phenyl group. A heteroaryl group may be a furyl group, a pyranyl group, a thienyl group, a pyridyl group, or the like. A C1 heteroaryl group refers to a group containing one aromatic ring with one carbon atom. An arylalkylene group refers to an alkylene group substituted with an aryl group, and a C7 arylalkylene group refers to a C1 alkylene group substituted with a phenyl group. A heteroarylalkylene group refers to an alkylene group substituted with a heteroaryl group, and a C2 heteroarylalkylene group refers to a C1 alkylene group substituted with a C1 heteroaryl group.

[0059] For example, when L1 and L2 are arylalkylene groups, the position where nitrogen is connected to the arylalkylene group can be the alkylene portion of the arylalkylene group; the nitrogen mentioned here is the nitrogen connected to the IB portion, the IC portion, and the first substituent unit IA.

[0060] For example, when L1 and L2 are heteroarylalkylene, the position where nitrogen is connected to the heteroarylalkylene can be the alkylene portion of the heteroarylalkylene; the nitrogen mentioned here is the nitrogen connected to the IB portion, the IC portion, and the first substituent unit IA.

[0061] When L1 and L2 are selected from substituted C6-C30 arylene groups, substituted C1-C30 heteroarylene groups, substituted C7-C30 aralkylene groups and substituted C2-C30 heteroaralkylene groups, the types of the substituents are not limited herein.

[0062] When R1, R2, R4, R5 and R6 are selected from substituted C1-C39 alkyl, substituted C2-C39 alkenyl, substituted C2-C39 alkynyl, substituted C6-C39 aryl, substituted C5-C60 heteroaryl, substituted C6-C60 aryloxy, substituted C1-C39 alkoxy, substituted C6-C39 arylamino, substituted C3-C39 cycloalkyl, substituted C3-C39 heterocycloalkyl, substituted C1-C39 alkylsilyl, substituted C1-C39 alkylboryl, substituted C6-C39 arylboryl, substituted C6-C39 arylphosphino, substituted C6-C39 arylsilyl, the type of substituent is not limited herein.

[0063] In the general formula (I), L1 is connected to carbon 1 of the IB moiety. Regarding the connection position of R1 to the IB moiety shown in the general formula (I), it means that R1 can be connected to any of carbons 2, 3, 6, 7, 8, 9, and 12 of the IB moiety, that is, R1 can be connected to any of carbons 2, 3, 6, 7, 8, 9, and 12 that has a substituted position.

[0064] When the value of q is greater than or equal to 2, that is, the number of R1s is greater than or equal to 2, the types of the q R1s may be the same or different.

[0065] Regarding the connection position of R2 and the IC part shown in the general formula (I), it means that R2 can be connected to any one of the carbon atoms 1', 2', 3', 4', 5', 6', 7', and 8' of the IC part, that is, R2 can be connected to any one of the carbon atoms 1', 2', 3', 4', 5', 6', 7', and 8' that has a substitution position.

[0066] When the value of n is greater than or equal to 2, that is, the number of R2 is greater than or equal to 2, the types of the n R2 can be the same or different.

[0067] As can be seen from the structure shown in general formula (I), the functional layer material F is a triarylamine material. By connecting N to the IA portion, the IB portion, and the IC portion, the functional layer material F is made into a hole-type material, which can be used to transport holes and / or block electrons. For example, as shown in Figure 1, in the structure diagram of the light-emitting device 100, the functional layer material F is used to form the first type of functional layer 132 having a hole-transporting function, such as the electron-blocking functional layer 13213 and the hole-transporting functional layer 13212, which is used to transport holes to the light-emitting layer 131 (for a description of the structure of the light-emitting device 100, see below and will not be repeated here).

[0068] Moreover, the three substitution units of the triarylamine material are the first substitution unit IA, the second substitution unit IB and the third substitution unit IC. Among them, the heteroatom X or Y in the second substitution unit IB can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and improve the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the second substitution unit IB has a higher triplet energy level T1, the functional layer material F can have a relatively high triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transported in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved. The third substitution unit IC contains a carbazole group, that is, The functional layer material F can be given a suitable highest occupied molecular orbital energy level (HOMO), reducing the energy gap (GAP) that holes need to overcome when transmitting from the first type functional layer 132 to the light-emitting layer 131. In this way, the voltage required to drive the light-emitting device 100 to emit light can be effectively reduced, thereby reducing the power consumption of the light-emitting device 100. Furthermore, because the first substitution unit IA is a fused ring aromatic group with relatively good conjugation, the second substitution unit IB and the third substitution unit IC can cooperate to make the light-emitting device 100 have relatively higher luminous efficiency, relatively lower voltage, and extended service life.

[0069] In some embodiments, the functional layer material F is selected from any one of the structures represented by the following general formula (II).

[0070] Wherein, L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group and a substituted or unsubstituted C2-C30 heteroaralkylene group; and L3 and L1 are the same or different, and L3 and L2 are the same or different.

[0071] R3 is selected from hydrogen, deuterium, substituted or unsubstituted C1-C39 alkyl, substituted or unsubstituted C2-C39 alkenyl, substituted or unsubstituted C2-C39 alkynyl, substituted or unsubstituted C6-C39 aryl, substituted or unsubstituted C5-C60 heteroaryl, substituted or unsubstituted C6-C60 aryloxy, substituted or unsubstituted C1-C39 alkoxy, substituted or unsubstituted C6-C39 arylamino, substituted or unsubstituted C3-C39 cycloalkyl, substituted or unsubstituted C3-C39 heterocycloalkyl, substituted or unsubstituted C1-C39 alkylsilyl, substituted or unsubstituted C1-C39 alkylboryl, substituted or unsubstituted C6-C39 arylboryl, substituted or unsubstituted C6-C39 arylphosphino, substituted or unsubstituted C6-C39 arylsilyl.

[0072] The value of m is a positive integer greater than or equal to 1.

[0073] Exemplarily, the value of m can be any one of 1, 2, 3, 4, 5, 6, 7, 8 and 9.

[0074] It is understood that IA-1 in the general formula (II) is a phenanthryl group.

[0075] It should be noted that L3 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C30 heteroarylene group, a substituted or unsubstituted C7-C30 aralkylene group, and a substituted or unsubstituted C2-C30 heteroaralkylene group. When L3 is a single bond, the nitrogen atom and one of the carbon atoms on the phenanthrenyl group are directly connected by a covalent bond. For the description of the substituted or unsubstituted C6-C30 arylene group, substituted or unsubstituted C1-C30 heteroarylene group, substituted or unsubstituted C7-C30 aralkylene group and substituted or unsubstituted C2-C30 heteroaralkylene group, please refer to the description of the substituted or unsubstituted C6-C30 arylene group, substituted or unsubstituted C1-C30 heteroarylene group, substituted or unsubstituted C7-C30 aralkylene group and substituted or unsubstituted C2-C30 heteroaralkylene group in the general formula (I) above, which will not be repeated here.

[0076] It should be noted that when R3 is selected from a substituted C1-C39 alkyl group, a substituted C2-C39 alkenyl group, a substituted C2-C39 alkynyl group, a substituted C6-C39 aryl group, a substituted C5-C60 heteroaryl group, a substituted C6-C60 aryloxy group, a substituted C1-C39 alkoxy group, a substituted C6-C39 arylamine group, a substituted C3-C39 cycloalkyl group, a substituted C3-C39 heterocycloalkyl group, a substituted C1-C39 alkylsilyl group, a substituted C1-C39 alkylboryl group, a substituted C6-C39 arylboryl group, a substituted C6-C39 arylphosphino group, and a substituted C6-C39 arylsilyl group, the type of the substituent is not limited here.

[0077] Regarding the connection position of L3 and the phenanthryl group shown in the general formula (II), it means that L3 can be connected to any one of carbon atoms 1", 2", 3", 4", 5", 6", 7", 8", 9", and 10" of the IA-1 portion, that is, L3 can be connected to any one of carbon atoms 1", 2", 3", 4", 5", 6", 7", 8", 9", and 10" that has a substitution position.

[0078] Regarding the connection position of R3 and the phenanthryl group shown in the general formula (II), it means that R3 can be connected to any one of carbon atoms 1", 2", 3", 4", 5", 6", 7", 8", 9", and 10" of the IA-1 portion, that is, R3 can be connected to any one of carbon atoms 1", 2", 3", 4", 5", 6", 7", 8", 9", and 10" that has a substitution position.

[0079] When m is greater than or equal to 2, that is, the number of R2 is greater than or equal to 2, the types of the m R3 may be the same or different.

[0080] It is understood that when the fused ring aromatic group in the first substituent group IA in the structure represented by general formula (I) contains a phenanthryl group, the structure represented by general formula (I) can be transformed into the structure represented by general formula (II). It should be noted that the fused ring aromatic group herein refers to a phenanthryl group, or the fused ring aromatic group is another fused ring aromatic group formed by further condensing on the phenanthryl group.

[0081] Based on the structure shown in general formula (II), the condensed ring aromatic group in the first substitution unit IA of the functional layer material F contains a phenanthryl group, which is a structure formed by three six-membered carbon rings fused together, has a large conjugated area, and can produce a better conjugated effect. In this way, under the cooperation of the second substitution unit IB and the third substitution unit IC, the luminous efficiency of the light-emitting device 100 can be relatively higher, the voltage can be relatively lower, and the service life can be extended.

[0082] In some embodiments, X is oxygen and Y is a single bond. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (V).

[0083] When X is oxygen and Y is a single bond, the IB part in the general formula (I) is transformed into the IB-1 part in the general formula (V). The IB-1 part in the general formula (V) contains a dibenzofuran structure. The heteroatom oxygen in the dibenzofuran structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and increase the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the dibenzofuran structure has a higher triplet energy level T1, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can remain in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0084] An exemplary structure of the functional layer material F in the structure represented by general formula (V) is described below.

[0085] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0086] In some examples, when L1 is a single bond, L2 is a biphenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0087] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0088] In some examples, when L1 is a phenylene group, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0089] In some examples, when L1 is a phenylene group, L2 is a naphthylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0090] In some examples, when L1 is a phenylene group, L2 is a biphenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0091] In some examples, when L1 is a phenylene group, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0092] It should be noted that the above-listed structural formulas are examples of the structure of the functional layer material F, and are not intended to limit the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not part of the structural formula structure, where x is a positive integer.

[0093] In some embodiments, X is sulfur and Y is a single bond. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (VI).

[0094] When X is sulfur and Y is a single bond, the IB part in the general formula (I) is transformed into the IB-2 part in the general formula (VI). The IB-2 part in the general formula (VI) contains a dibenzothiophene structure. The heteroatom sulfur in the dibenzothiophene structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, increase the recombination probability of holes and electrons in the light-emitting layer 131, and improve the emission efficiency. At the same time, since the dibenzothiophene structure has a higher triplet energy level T1, the functional layer material F can have a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can remain in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0095] An exemplary structure of the functional layer material F in the structure represented by the general formula (VI) is described below.

[0096] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0097] In some examples, when L1 is a single bond, L2 is a biphenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0098] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

[0099] In some examples, when L1 is a single bond, L2 is a biphenylene group, and L3 is a phenylene group, the structural formula of the functional layer material F can be as shown below.

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

[0101] In some examples, when L1 is a phenylene group, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0102] It should be noted that the above-listed structural formulas are examples of the structure of the functional layer material F, and are not intended to limit the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not part of the structural formula structure, where x is a positive integer.

[0103] In some embodiments, X is oxygen and Y is oxygen. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (VII).

[0104] When X is oxygen and Y is oxygen, the IB portion in general formula (I) is transformed into the IB-3 portion in general formula (VII). The IB-3 portion in general formula (VII) contains a dibenzo-p-dioxin structure. The heteroatom oxygen in the dibenzo-p-dioxin structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, increase the probability of recombination of holes and electrons in the light-emitting layer 131, and improve the emission efficiency. At the same time, since the dibenzo-p-dioxin structure has a higher triplet energy level T1, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted toward the first type functional layer 132, allowing more excitons to remain in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0105] An exemplary structure of the functional layer material F in the structure represented by the general formula (VII) is described below.

[0106] In some examples, when L1 is a single bond, L2 is a phenylene group, and L3 is a single bond, the structural formula of the functional layer material F can be as shown below.

[0107] It should be noted that the above-listed structural formulas are examples of the structure of the functional layer material F, and are not intended to limit the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not part of the structural formula structure, where x is a positive integer.

[0108] In some embodiments, X is oxygen and Y is sulfur. That is, the functional layer material F is selected from any one of the structures shown in the following general formula (VIII).

[0109] When X is oxygen and Y is sulfur, the IB portion in the general formula (I) is transformed into the IB-4 portion in the general formula (VIII). The IB-4 portion in the general formula (VIII) contains a dibenzothiophene structure (i.e., a thiophene structure). The heteroatoms oxygen and sulfur in the dibenzothiophene structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, and increase the recombination probability of holes and electrons in the light-emitting layer 131, thereby improving the emission efficiency. At the same time, since the dibenzothiophene structure has a higher triplet energy level T1, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted toward the first type functional layer 132, so that more excitons can remain in the light-emitting layer 131. In this way, the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0110] An exemplary structure of the functional layer material F in the structure represented by the general formula (VIII) is described below.

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

[0112] It should be noted that the above-listed structural formulas are examples of the structure of the functional layer material F, and are not intended to limit the functional layer material F. Moreover, Fx in the above structural formulas is a synonym for each structural formula, and is not part of the structural formula structure, where x is a positive integer.

[0113] In some embodiments, the functional layer material F is selected from any one of the structures represented by the following general formula (III).

[0114] It can be understood that when L3 is connected to the 1" carbon of the IA-1 part (i.e., the phenanthryl group) in the structure shown in general formula (II), the structure shown in general formula (II) can be transformed into the structure shown in general formula (III). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 1" carbon of the IA-1 part and the structure when L3 is connected to the 10" carbon of the IA-1 part are the same structure.

[0115] An exemplary structure of the functional layer material F in the structure represented by the general formula (III) is described below.

[0116] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-4), (F-8), (F-12), (F-16), (F-20), and (F-24).

[0117] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-31), (F-35), (F-39), (F-43), (F-47), (F-51), (F-55), (F-58), and (F-63).

[0118] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown above (F-67).

[0119] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown above (F-71).

[0120] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0121] In some embodiments, the functional layer material F is selected from any one of the structures represented by the following general formula (IV).

[0122] It can be understood that when L3 is connected to the 4" carbon of the IA-1 part (i.e., the phenanthryl group) in the structure shown in general formula (II), the structure shown in general formula (II) can be transformed into the structure shown in general formula (IV). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 4" carbon of the IA-1 part and the structure when L3 is connected to the 7" carbon of the IA-1 part are the same structure.

[0123] An exemplary structure of the functional layer material F in the structure represented by the general formula (IV) is described below.

[0124] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-3), (F-7), (F-11), (F-14), (F-18), and (F-23).

[0125] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-30), (F-34), (F-38), (F-42), (F-46), (F-53), (F-49), (F-59), and (F-62).

[0126] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown above (F-66).

[0127] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown above (F-69).

[0128] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0129] In some embodiments, the functional layer material F is selected from any one of the structures represented by the following general formula (VIIII).

[0130] It can be understood that when L3 is connected to the 5" carbon of the IA-1 part (i.e., the phenanthryl group) in the structure shown in general formula (II), the structure shown in general formula (II) can be transformed into the structure shown in general formula (VIIII). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 5" carbon of the IA-1 part and the structure when L3 is connected to the 6" carbon of the IA-1 part are the same structure.

[0131] An exemplary structure of the functional layer material F in the structure represented by the general formula (VIIII) is described below.

[0132] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-1), (F-5), (F-9), (F-13), (F-17), (F-21), (F-25), (F-26), and (F-27).

[0133] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-28), (F-32), (F-36), (F-40), (F-44), (F-48), (F-52), (F-56), and (F-60).

[0134] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown in (F-64) above.

[0135] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown above (F-68).

[0136] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0137] In some embodiments, the functional layer material F is selected from any one of the structures represented by the following general formula (X).

[0138] It can be understood that when L3 is connected to the 3" carbon of the IA-1 part (i.e., the phenanthryl group) in the structure shown in general formula (II), the structure shown in general formula (II) can be transformed into the structure shown in general formula (X). It should be noted that since the phenanthryl structure is a symmetrical structure, when R1 is hydrogen, the structure when L3 is connected to the 3" carbon of the IA-1 part and the structure when L3 is connected to the 8" carbon of the IA-1 part are the same structure.

[0139] An exemplary structure of the functional layer material F in the structure represented by the general formula (X) is described below.

[0140] In some examples, when X is oxygen and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-2), (F-6), (F-10), (F-15), (F-19), and (F-22).

[0141] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown above (F-29), (F-33), (F-37), (F-41), (F-45), (F-50), (F-54), (F-57), and (F-61).

[0142] In some examples, when X is oxygen and Y is oxygen, the structural formula of the functional layer material F can be as shown above (F-65).

[0143] In some examples, when X is oxygen and Y is sulfur, the structural formula of the functional layer material F can be as shown above (F-70).

[0144] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0145] In order to improve the molecular stability of the functional layer material F, in some embodiments, when the functional layer material F is selected from any one of the structures shown in general formula (I), the structure shown in general formula (I) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures shown in general formula (II), the structure shown in general formula (II) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures shown in general formula (III), the structure shown in general formula (III) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures shown in general formula (IV), the structure shown in general formula (IV) contains at least one deuterium. Or,

[0146] When the functional layer material F is selected from any one of the structures represented by general formula (V), the structure represented by general formula (V) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures represented by general formula (VI), the structure represented by general formula (VI) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures represented by general formula (VII), the structure represented by general formula (VII) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures represented by general formula (VIII), the structure represented by general formula (VIII) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures represented by general formula (VIIII), the structure represented by general formula (VIIII) contains at least one deuterium; or, when the functional layer material F is selected from any one of the structures represented by general formula (X), the structure represented by general formula (X) contains at least one deuterium.

[0147] Since the atomic weight of deuterium is twice that of hydrogen, the physical properties of the functional layer material F will change by setting up the structure shown in the above general formula to contain at least one deuterium. Specifically, after the functional layer material F is replaced by deuterium, it can effectively suppress molecular vibration, reduce bond length, increase bond energy, and improve molecular stability. In this way, the stability of the functional layer material F is improved, and the service life of the light-emitting device 100 can be extended.

[0148] The following describes the substitution position of deuterium using the structure represented by general formula (II) as an example. The structure represented by general formula (II) contains at least one deuterium, which means that the structure represented by general formula (II) satisfies at least one of the following five conditions: (1) in the IA-1 portion, at least one carbon substituent is deuterium or contains deuterium; (2) in the case where Y is selected from O and S, in the IB portion, at least one carbon substituent among carbons 1 to 12 is deuterium or contains deuterium; or, in the case where Y is selected from N(R4) and C(R5R6), in the IB portion, at least one substituent among carbons 1 to 12 and Y is deuterium or contains deuterium; (3) in the IC portion, at least one carbon substituent is deuterium or contains deuterium; (4) in L1, L2 and L3, at least one substituent is deuterium or contains deuterium; (5) in R1, R2 and R3, at least one substituent is deuterium or contains deuterium. That is, the substitution position of deuterium in the structure represented by general formula (II) is not limited here. For understanding of other general formulas containing at least one deuterium, please refer to the above content and will not be repeated here.

[0149] The following describes an exemplary structure of the functional layer material F containing at least one deuterium in the general formula (VI).

[0150] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-44), (F-45), (F-46), and (F-47) above.

[0151] As shown in the above-mentioned structural formulas (F-44), (F-45), (F-46) and (F-47), the functional layer material F has the following structure: in the structure shown in the general formula (VI), there is no limitation on the position of deuterium substitution. For example, the deuterium substitution position can be located in the L2 part, as shown in (F-47); or, the deuterium substitution position can be located in the R2 part, as shown in (F-46); or, the deuterium substitution position can be located in the R1 part, as shown in (F-44) and (F-45).

[0152] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0153] In some embodiments, when m is greater than 2, two adjacent R3 groups can be bonded to form a ring.

[0154] It can be understood that, on the first aspect, when two adjacent R3 are bonded to form a ring, the number of aromatic rings forming a condensed aromatic group in the IA-1 part of the structure shown in the general formula (II) is greater than three, that is, at least one aromatic ring is fused with the phenanthrenyl group. In this way, the first substitution unit IA part of the structure of the functional layer material F can have a larger conjugated area and can produce a better conjugated effect. In this way, with the cooperation of the second substitution unit IB and the third substitution unit IC, the luminous efficiency of the light-emitting device 100 can be relatively higher, the voltage can be relatively lower, and the service life can be extended. Secondly, when two adjacent R3s are bonded to form a ring, the connected ring portion can increase the overall rigidity of the molecule of the functional layer material F, thereby having a higher glass transition temperature Tg, increasing the stability of the material, and thereby extending its life; thirdly, compared to the structure in which two adjacent R3s exist but are not connected to form a ring, two adjacent R3s bonded to form a ring can appropriately reduce the three-dimensionality of the structure of the functional layer material F, thereby improving the mobility; fourthly, by setting up two adjacent R3s to form a ring, the variety of the functional layer material F can be increased, so that the functional layer material F can be combined with different types of electron transport materials to achieve carrier balance.

[0155] The following describes an exemplary structure of the functional layer material F when two adjacent R3 are bonded to form a ring.

[0156] In some examples, when X is sulfur and Y is a single bond, the structural formula of the functional layer material F can be as shown in (F-32), (F-33), (F-34), and (F-35) above.

[0157] As shown in the above structural formulas (F-32), (F-33), (F-34) and (F-35), the functional layer material F has no limitation on the position of two adjacent R3 bonds to form a ring in the structure shown in the general formula (II). For example, the positions at which two adjacent R3s bond to form a ring can be the positions of carbon numbers 2” and 3”, that is, two adjacent R3s can form an aromatic ring with carbon numbers 2” and 3”, as shown in (F-32); or, the positions at which two adjacent R3s bond to form a ring can be the positions of carbon numbers 9” and 10”, that is, two adjacent R3s can form an aromatic ring with carbon numbers 9” and 10”, as shown in (F-33); or, the positions at which two adjacent R3s bond to form a ring can be the positions of carbon numbers 1” and 2”, that is, two adjacent R3s can form an aromatic ring with carbon numbers 1” and 2”, as shown in (F-34); or, the positions at which two adjacent R3s bond to form a ring can be the positions of carbon numbers 3” and 4”, that is, two adjacent R3s can form an aromatic ring with carbon numbers 3” and 4”, as shown in (F-35). It should be noted that the position of two adjacent R3s bonded to form a ring is represented by the carbon number. This number is only for illustrating the position of two adjacent R3s bonded to form a ring and the relative relationship between the connection position of L3 and the phenanthryl group, and is not a limitation on the structure of the functional layer material F.

[0158] It should be noted that the structural formula listed above is an example of the structure of the functional layer material F, and does not limit the functional layer material F.

[0159] In some embodiments, when q is greater than 2, two adjacent R1 groups can be bonded to form a ring.

[0160] It is understood that when two adjacent R1 groups are bonded to form a ring, in the IB portion of the structure represented by general formula (I), at least one benzene ring is fused to the ring formed by the bonded two adjacent R1 groups. It should be noted that the position of the shared carbon atom when the benzene ring is fused to the ring formed by the bonded two adjacent R1 groups is not limited herein.

[0161] By setting up that two adjacent R1s can be bonded to form a ring, on the one hand, the part connected to form a ring can increase the overall rigidity of the molecule of the functional layer material F, thereby having a higher glass transition temperature Tg, increasing the stability of the material, and thus extending the life; on the other hand, compared with the structure in which two adjacent R1s exist but are not connected to form a ring, the two adjacent R1s bonded to form a ring can appropriately reduce the three-dimensionality of the structure of the functional layer material F, thereby improving the mobility; on the third hand, by setting up that two adjacent R1s are bonded to form a ring, the variety of the functional layer material F can be increased, so that the functional layer material F can be matched with different types of electron transport materials to achieve carrier balance.

[0162] In some embodiments, when n is greater than 2, two adjacent R2 groups can be bonded to form a ring.

[0163] It is understood that when two adjacent R2 groups are bonded to form a ring, in the IC portion of the structure represented by general formula (I), at least one benzene ring is fused to the ring formed by the bonded two adjacent R2 groups. It should be noted that the position of the shared carbon atom when the benzene ring is fused to the ring formed by the bonded two adjacent R2 groups is not limited herein.

[0164] By setting up that two adjacent R2s can be bonded to form a ring, on the one hand, the part connected to form a ring can increase the overall rigidity of the molecule of the functional layer material F, thereby having a higher glass transition temperature Tg, increasing the stability of the material, and thus extending the life; on the other hand, compared with the structure in which two adjacent R2s exist but are not connected to form a ring, the two adjacent R2s bonded to form a ring can appropriately reduce the three-dimensionality of the structure of the functional layer material F, thereby improving the mobility; on the third hand, by setting up that two adjacent R2s are bonded to form a ring, the variety of the functional layer material F can be increased, so that the functional layer material F can be matched with different types of electron transport materials to achieve carrier balance.

[0165] The following describes the synthesis process of the functional layer material F using the functional layer material F having the structural formulas (F-1) and (F-2) as examples.

[0166] In the related art, carbon-carbon coupling reactions and carbon-nitrogen coupling reactions are widely used in the synthesis of organic materials. Examples of carbon-carbon coupling reactions include Suzuki coupling reaction, Negishi coupling reaction, Yamamoto coupling reaction, Grignard coupling reaction, Stille coupling reaction, and Heck coupling reaction. Examples of carbon-nitrogen coupling reactions include Buchwald coupling reaction, Ullmann coupling reaction, silylation reaction, phosphating reaction, borylation reaction, and polycondensation reaction.

[0167] The above reaction is, for example, represented by the following general reaction formula (A):

[0168] It should be noted that the catalyst of reaction formula (A) is Pb2(dba)3 (trisdibenzylideneacetone dipalladium), P(t-Bu)3 (tri(tert-butyl)phosphine) and NaOt-Bu (sodium tert-butoxide), and the reaction solvent is toluene. The catalyst of reaction formula (B) is lead (Pb). X is one of chlorine, bromine and iodine. Ar d 、Ar b 、Ar c is a group that needs to be connected through a coupling reaction.

[0169] Illustratively, based on the above general reaction formula (A), the preparation method of the functional layer material (F-1) includes steps S1 to S3.

[0170] S1: p-Bromoiodobenzene (15 mmol), carbazole (15 mmol) and toluene (50 ml) were added to the reaction vessel, p-Bromoiodobenzene and carbazole were dissolved in toluene, and then tris dibenzylideneacetone palladium Pd2(dba)3 (0.15 mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.8 mmol) and sodium tert-butoxide t-BuONa (45 mmol) were added under a nitrogen atmosphere. After the addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10 hours. Distilled water was then added to the reaction solution, and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried over magnesium sulfate, and the solvent was removed using a rotary evaporator. The remaining substance was purified by column chromatography to obtain the intermediate compound Sub-1 with a yield of 80%.

[0171] S2: 9-Aminophenanthrene (15 mmol) and 2-bromodibenzofuran (15 mmol) and toluene (50 ml) were added to the reaction vessel, 9-aminophenanthrene and 2-bromodibenzofuran were dissolved in toluene, and then tris dibenzylideneacetone palladium Pd2(dba)3 (0.15 mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.8 mmol) and sodium tert-butoxide t-BuONa (45 mmol) were added under a nitrogen atmosphere. After the addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10 hours. Distilled water was then added to the reaction solution, and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried over magnesium sulfate, and the solvent was removed using a rotary evaporator. The remaining substance was purified by column chromatography to obtain the intermediate compound sub-2 with a yield of 78%.

[0172] S3: Add intermediate compound Sub-1 (12 mmol), intermediate compound Sub-2 (12 mmol) and toluene (40 ml) to the reaction vessel, dissolve intermediate compound Sub-1 and intermediate compound Sub-2 in toluene, and then add tridibenzylideneacetone palladium Pd2(dba)3 (0.12 mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.64 mmol) and sodium tert-butoxide t-BuONa (36 mmol) under a nitrogen atmosphere. After addition, the reaction temperature is slowly raised to 110°C, and the mixture is stirred at this temperature for 10 hours. Distilled water is then added to the reaction solution, and the reaction solution is extracted with ethyl acetate. The organic layer obtained by the extraction is then dried over magnesium sulfate, and the solvent is removed using a rotary evaporator. The remaining substance is purified by column chromatography to obtain a functional layer material (F-1) with a yield of 75%.

[0173] Illustratively, based on the above general reaction formula (A), the preparation method of the functional layer material (F-2) includes steps P1 to P3.

[0174] P1: p-Bromoiodobenzene (15 mmol), carbazole (15 mmol) and toluene (50 ml) were added to a reaction vessel, p-Bromoiodobenzene and carbazole were dissolved in toluene, and then tris dibenzylideneacetone palladium Pd2(dba)3 (0.15 mmol), (tert-butyl)phosphine P(t-Bu)3 (0.8 mmol) and sodium tert-butoxide t-BuONa (45 mmol) were added under a nitrogen atmosphere. After the addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10 hours. Distilled water was then added to the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried over magnesium sulfate, and the solvent was removed using a rotary evaporator. The remaining substance was purified by column chromatography to obtain the intermediate compound Sub-1 with a yield of 80%.

[0175] P2: 2-Aminophenanthrene (15 mmol), 2-bromodibenzofuran (15 mmol) and toluene (50 ml) were added to a reaction vessel, 2-phenanthrenylamine and 2-bromodibenzofuran were dissolved in toluene, and then tris dibenzylideneacetone palladium Pd2(dba)3 (0.15 mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.8 mmol) and sodium tert-butoxide t-BuONa (45 mmol) were added under a nitrogen atmosphere. After the addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10 hours. Distilled water was then added to the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried over magnesium sulfate, and the solvent was removed using a rotary evaporator. The remaining substance was purified by column chromatography to obtain the intermediate compound Sub-3 with a yield of 75%.

[0176] P3: Intermediate compound Sub-1 (12 mmol), intermediate compound Sub-3 (12 mmol) and toluene (40 ml) were added to a reaction vessel, and intermediate compounds Sub-1 and intermediate compound Sub-3 were dissolved in toluene. Then, trisdibenzylideneacetone palladium Pd2(dba)3 (0.12 mmol), tri(tert-butyl)phosphine P(t-Bu)3 (0.64 mmol) and sodium tert-butoxide t-BuONa (36 mmol) were added under a nitrogen atmosphere. After the addition, the reaction temperature was slowly raised to 110°C, and the mixture was stirred at this temperature for 10 hours. Distilled water was then added to the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer obtained by the extraction was then dried over magnesium sulfate, and the solvent was removed using a rotary evaporator. The remaining material was purified by column chromatography to obtain a functional layer material (F-2) with a yield of 77%.

[0177] On the other hand, as shown in FIG1 , a light emitting device 100 is provided. The structure of the light emitting device 100 is described below.

[0178] Some embodiments of the present disclosure provide a light-emitting device 100, as shown in FIG1 , comprising a cathode 110 and an anode 120 disposed opposite each other, and at least one light-emitting unit 130 disposed between the cathode 110 and the anode 120. The light-emitting unit 130 comprises a light-emitting layer 131 and a first functional layer 132 disposed on a side of the light-emitting layer 131 proximal to the anode 120. The material of the first functional layer 132 comprises the functional layer material F described in any of the above embodiments. The light-emitting device 100 is, for example, an OLED light-emitting device.

[0179] The light-emitting device 100 includes at least one light-emitting unit 130. When the light-emitting device 100 includes one light-emitting unit 130, the light-emitting device 100 is a single-layer light-emitting device 100. When the light-emitting device 100 includes multiple light-emitting units 130, the light-emitting device 100 is a stacked light-emitting device 100. Furthermore, the multiple light-emitting units 130 of the stacked light-emitting device 100 are sequentially connected in a direction perpendicular to the light-emitting surface. The vertical direction of the light-emitting surface is the first direction P shown in FIG. 1 .

[0180] Based on the above structure, the light-emitting device 100 emits light as follows: through a circuit connected by the cathode 110 and the anode 120, the anode 120 injects holes into the light-emitting layer 131, and the cathode 110 injects electrons into the light-emitting layer 131. The injected electrons and holes form excitons (i.e., electron-hole pairs) in the light-emitting layer 131. The excitons return to the ground state through radiative transitions, emitting photons. It can be seen that the light-emitting process of the light-emitting device 100 requires both efficient charge injection and rapid charge transport. The charges mentioned above are either holes or electrons.

[0181] The above-mentioned first type functional layer 132 is arranged on the side of the light-emitting layer 131 close to the anode 120, and is configured to transport holes and / or block electrons; firstly, it can achieve effective hole injection and rapid hole transport; secondly, it can make the electrons stay in the light-emitting layer 131 as much as possible, so that the electrons and holes are balanced during the light-emitting process, thereby improving the light-emitting efficiency of the light-emitting layer 131.

[0182] By including the functional layer material F in the material of the first type functional layer 132, the functional layer material F can, on the one hand, perform hole transport and / or electron blocking functions, thereby achieving efficient hole injection and rapid hole transport. On the other hand, since the structural formula of the functional layer material F includes the second substitution unit IB, the heteroatom X or Y in the second substitution unit IB can improve the hole transport capability of the functional layer material F, increasing the amount of holes transported to the light-emitting layer 131, thereby increasing the probability of hole and electron recombination in the light-emitting layer 131 and improving the emission efficiency. Furthermore, since the second substitution unit IB has a relatively high triplet energy level T1, the functional layer material F can have a relatively high triplet energy level T1, thereby blocking excitons in the light-emitting layer 131 from being transported toward the first type functional layer 132, allowing more excitons to remain in the light-emitting layer 131, thereby effectively improving the luminous efficiency of the light-emitting device 100. Thirdly, because the structural formula of the functional layer material F includes the third substituent unit IC containing a carbazole group, the functional layer material F has a suitable highest occupied molecular orbital energy level (HOMO), which reduces the energy gap (GAP) that needs to be overcome when holes are transmitted from the first type functional layer 132 to the light-emitting layer 131. As a result, the voltage driving the light-emitting device 100 to emit light can be effectively reduced, thereby reducing the power consumption of the light-emitting device 100. Fourthly, because the structural formula of the functional layer material F includes the first substituent unit IA containing a fused ring aromatic group, the functional layer material F has relatively good conjugation. In conjunction with the second substituent unit IB and the third substituent unit IC, the light-emitting device 100 can have a relatively higher luminous efficiency, a relatively lower voltage, and a longer service life.

[0183] It should be noted that when the light-emitting device 100 is a stacked light-emitting device, the first type functional layer 132 including the functional layer material F may be located in one of the plurality of light-emitting units 130; or, it may be located in a portion of the plurality of light-emitting units 130; or, it may be located in each of the plurality of light-emitting units 130. In other words, when the light-emitting device 100 is a stacked light-emitting device 100, there is no limitation on the number of light-emitting units 130 including the functional layer material F.

[0184] In some embodiments, as shown in FIG. 1 , the first type functional layer 132 includes a plurality of sub-functional layers 1321 , and at least one sub-functional layer 1321 of the plurality of sub-functional layers 1321 includes a functional layer material F.

[0185] It can be understood that when the first type functional layer 132 includes multiple sub-functional layers 1321, by setting at least one sub-functional layer 1321 among the multiple sub-functional layers 1321 to include functional layer material F, the luminous efficiency of the light-emitting device 100 can be effectively improved, the voltage driving the light-emitting device 100 to emit light can be effectively reduced, and the service life of the light-emitting device 100 can be extended.

[0186] Exemplarily, as shown in FIG. 1 , the first type functional layer 132 includes any one or more of a hole injection functional layer 13211 , a hole transport functional layer 13212 , and an electron blocking functional layer 13213 .

[0187] In some embodiments, as shown in Figure 1, the multiple sub-functional layers 1321 include an electron blocking functional layer 13213, a hole injection functional layer 13211 and a hole transport functional layer 13212 that are stacked; the hole injection functional layer 13211, the hole transport functional layer 13212 and the electron blocking functional layer 13213 are arranged in sequence along a direction away from the anode 120; among the hole injection functional layer 13211, the hole transport functional layer 13212 and the electron blocking functional layer 13213, at least the electron blocking functional layer 13213 includes functional layer material F.

[0188] Based on the structure shown in the general formula above, the functional layer material F has excellent exciton-blocking properties. When at least the electron-blocking functional layer 13213 of the multiple sub-functional layers 1321 of the first-type functional layer 132 includes the functional layer material F, the functional layer material F can be positioned close to the light-emitting layer 131 to perform its exciton-blocking function. This allows the excitons to be retained in the light-emitting layer 131 as much as possible, further improving the luminous efficiency of the light-emitting layer 131.

[0189] In some embodiments, as shown in Figure 1, the light-emitting unit 130 also includes a second functional layer 133. The second functional layer 133 is located on the side of the light-emitting layer 131 close to the cathode 110 and is configured to transmit electrons or block holes. First, it can achieve effective electron injection and rapid electron transmission. Second, it can block holes, which is beneficial to the balance between electrons and holes during the light-emitting process.

[0190] Exemplarily, the second type functional layer 133 includes any one or more of an electron injection functional layer 1331 , an electron transport functional layer 1332 and a hole blocking functional layer 1333 .

[0191] As shown in Figure 1, when the second type of functional layer 133 includes an electron injection functional layer 1331, an electron transport functional layer 1332 and a hole blocking functional layer 1333, the second type of functional layer 133 is arranged in sequence in a direction away from the cathode 110, for example.

[0192] In some embodiments, the light-emitting layer 131 is configured to emit blue light. The material of the light-emitting layer 131 includes a host material and a guest material. The BH structural formula of the host material is shown below.

[0193] The structural formula of the guest material BD is shown below.

[0194] The materials of the light-emitting layer 131 include a host material and a guest material. For example, the host material can be configured to transmit energy via fluorescence resonance energy transfer; the guest material D can be configured to obtain energy from the host material fluorescence resonance energy transfer and emit blue light.

[0195] It is understood that when the light-emitting layer 131 is configured to emit blue light, the light-emitting device 100 is a blue light-emitting device. When the light-emitting device 100 is a blue light-emitting device, the configuration in which the material of the first type functional layer 132 includes the functional layer material F can achieve the following effects: On the one hand, because the light-emitting layer 131 of a blue light-emitting device contains a relatively large number of electrons, the configuration in which the material of the first type functional layer 132 includes the functional layer material F can increase the amount of holes transmitted to the light-emitting layer 131, thereby increasing the probability of hole-electron recombination in the light-emitting layer 131 and improving the emission efficiency. On the other hand, because the material of the light-emitting layer 131 of a blue light-emitting device has a relatively deep highest occupied molecular orbital (HOMO) energy level, and the functional layer material F containing a carbazole group also has a deep highest occupied molecular orbital (HOMO) energy level, this can reduce the energy gap (GAP) that must be overcome when transmitting from the first type functional layer 132 to the light-emitting layer 131, thereby effectively reducing the voltage required to drive the light-emitting device 100 to emit light, thereby reducing the power consumption of the light-emitting device 100. It should be noted that the deeper highest occupied molecular orbital energy level (HOMO) mentioned here means that the absolute value of the highest occupied molecular orbital energy level (HOMO) is larger.

[0196] In order to objectively evaluate the technical effects of the embodiments of the present disclosure, the technical solutions provided by the present disclosure will be described in detail and exemplarily through the following experimental examples and comparative examples.

[0197] The materials involved in the following experimental examples and comparative examples include:

[0198] It should be noted that NPB, PD, EBM-1, HBL-1, ETL-1, and Liq in the above structural formulas are aliases for each structural formula and are not part of the structural formula structure.

[0199] The following examples and comparative examples calculate and compare the highest occupied molecular orbital energy level (HOMO) and triplet energy level (T1) of the functional layer material F.

[0200] In the following examples and comparative examples, the calculation methods of the highest occupied molecular orbital energy level (HOMO) and the triplet energy level (T1) are the same, and the calculation results are shown in Table 1 below.

[0201] Table 1

[0202] It should be noted that the units of the highest occupied molecular orbital energy level (HOMO) and triplet energy level (T1) in Table 1 are electron volts, symbolized as eV. The structural formulas represented by Fx (x is a positive integer) and EBM-1 are as described above and are not repeated here.

[0203] As can be seen from Table 1, the highest occupied molecular orbital energy levels (HOMO) of the five functional layer materials F range from -4.91eV to -5.00eV. The five functional layer materials F all have a deeper highest occupied molecular orbital energy level (HOMO). In this way, the energy gap (GAP) that holes need to overcome when transmitting from the first type functional layer 132 to the light-emitting layer 131 can be reduced, and the voltage that drives the light-emitting device 100 to emit light can be effectively reduced. In this way, the power consumption of the light-emitting device 100 can be effectively reduced.

[0204] As can be seen from Table 1, the triplet energy levels (T1) of the five functional layer materials F range from 2.62 eV to -2.72 eV, which are all greater than the triplet energy level of (EBM-1), indicating that the functional layer material F has a relatively high triplet energy level T1. In this way, the excitons in the light-emitting layer 131 can be blocked from transmitting toward the direction close to the first type functional layer 132, so that more excitons can remain in the light-emitting layer 131, and the luminous efficiency of the light-emitting device 100 can be effectively improved.

[0205] The following embodiments and comparative examples use different materials to make the electron blocking functional layer 13213 of the light-emitting device 100, and compare the voltage, luminous efficiency, and device life of the light-emitting device 100.

[0206] In the following comparative examples and embodiments, the test conditions of the light emitting device 100 are the same; the test conditions of the same type of materials are the same.

[0207] As shown in FIG1 , the light-emitting device 100 in the following comparative examples and embodiments includes an anode 120 and a cathode 110 disposed opposite each other, and a light-emitting unit 130 disposed between the cathode 110 and the anode 120. The light-emitting unit 130 includes a first-type functional layer 132, a light-emitting layer 131, and a second-type functional layer 133. The first-type functional layer 132 includes a hole injection functional layer 13211, a hole transport functional layer 13212, and an electron blocking functional layer 13213, which are sequentially arranged in a direction away from the anode 120. The second-type functional layer 133 includes an electron injection functional layer 1331, an electron transport functional layer 1332, and a hole blocking functional layer 1333, which are sequentially arranged in a direction away from the cathode 110.

[0208] In the following comparative examples and embodiments, the thicknesses of the hole injection functional layer 13211, the hole transport functional layer 13212, the electron blocking functional layer 13213, the light-emitting layer 131, the hole blocking functional layer 1333, the electron transport functional layer 1332, and the electron injection functional layer 1331, which are stacked in the direction from the anode 120 to the cathode 110, are 10 nm, 80 nm, 10 nm, 20 nm, 5 nm, 30 nm, and 1 nm, respectively.

[0209] The following describes the portions of the film layer materials that are identical in the comparative examples and examples. In the following comparative examples and examples, the material of the anode 120 is indium tin oxide (ITO). The material of the hole injection functional layer 13211 includes the material represented by structural formula (NPB) and the material represented by structural formula (PD), with the mass ratio of the material represented by structural formula (NPB) to the material represented by structural formula (PD) being 97:3. The material of the hole transport functional layer 13212 is the material represented by structural formula (NPB). The material of the light-emitting layer 131 includes a host material and a guest material. The structure of the host material is represented by structural formula (BH) above, and the structure of the guest material is represented by structural formula (BD) above. The mass ratio of the host material to the guest material is 99:1. The structure of the material of the hole blocking functional layer 1333 is represented by structural formula (HBL-1), which is 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI). The electron transport layer 1332 is composed of the material represented by the structural formula (ETL-1) and the material represented by the structural formula (Liq), with the mass ratio of the material represented by the structural formula (ETL-1) to the material represented by the structural formula (Liq) being 1:1. The electron injection layer 1331 is composed of lithium fluoride (LiF). The cathode 110 is composed of a magnesium-silver alloy.

[0210] The materials used for the electron blocking functional layer 13213 are differentiated in the following comparative examples and examples. Specifically, the structure of the material for the electron blocking functional layer 13213 in Comparative Example 1 is shown in structural formula (EBM-1). The structures of the materials for the electron blocking functional layer 13213 in Examples 1 to 5 are shown in structural formulas (F-1), (F-3), (F-48), (F-45), and (F-67), respectively.

[0211] In order to more clearly describe the differences in the film material structures used in the light-emitting device 100 in the embodiment and the comparative example, the following Table 2 is used to more clearly show the film material structures used in the light-emitting device 100 in the embodiment and the comparative example.

[0212] Table 2

[0213] It should be noted that in Table 2, HI represents the hole injection functional layer 13211, HT represents the hole transport functional layer 13212, EBL represents the electron blocking functional layer 13213, EML represents the light-emitting layer 131, HB represents the hole blocking functional layer 1333, ET represents the electron transport functional layer 1332, and EI represents the electron injection functional layer 1331. "A / B" in Table 2 means that the material of the film layer includes material A and material B. For example, the material of HI is NPB / PD, which means that the material of the hole injection functional layer 13211 includes a material with a structural formula of (NPB) and a material with a structural formula of (PD). "Ax" in Table 2 means that the corresponding structural formula is Ax. For example, the content of the sub-grid corresponding to EBL in Example 1 is "F-1", which means that the material of the electron blocking functional layer 13213 in Example 1 is the functional layer material F with a structural formula as shown in (F-1). Among them, the structural formulas represented by Fx (x is a positive integer), NPB, PD, EBM-1, BH, BD, HBL-1, ETL-1, and Liq are as described above and will not be repeated here.

[0214] Based on the above materials, the voltage (V), luminous efficiency (Eff.), and device life (LT) of the light-emitting devices 100 of Examples 1 to 5 and Comparative Example 1 were tested. The voltage (V), luminous efficiency (Eff.), and device life (LT) data results were based on Comparative Example 1. The test results are shown in Table 3 below.

[0215] Table 3

[0216] As shown in Table 3, using the test data of Comparative Example 1 as a reference, the voltage range of Examples 1 to 5 is 94% to 96%, which is lower than the voltage of Comparative Example 1. This shows that the voltage of Examples 1 to 5 is relatively low, which can reduce the power consumption of the light-emitting device 100. The luminous efficiency of Examples 1 to 5 ranges from 128% to 135%, which is higher than the luminous efficiency of Comparative Example 1. This shows that the luminous efficiency of Examples 1 to 5 is significantly improved. The device lifespan of Examples 1 to 5 ranges from 135% to 168%, which is higher than the device lifespan of Comparative Example 1. This shows that the device lifespan of Examples 1 to 5 is significantly improved.

[0217] Among them, the device life of Example 4 is 168%, which is significantly higher than that of other examples and comparative examples. This is because the structure of the material of the electron blocking functional layer 13213 of Example 4 is as shown in the structural formula (F-45). In its second substitution unit IB part, it contains a deuterium substituent, which can effectively inhibit molecular vibration, reduce bond length, and increase bond energy, thereby improving molecular stability. In this way, the stability of the functional layer material F is improved, which can further extend the service life of the light-emitting device 100.

[0218] Therefore, it can be seen from the above tests that in the light-emitting device 100 provided by the present disclosure, an electron blocking functional layer 13213 containing a functional layer material F is provided, and the second substitution unit IB of the functional layer material F includes a dibenzofuran structure or a dibenzothiophene structure. In this way, the heteroatom oxygen in the dibenzofuran structure or the heteroatom sulfur in the dibenzothiophene structure can improve the hole transport ability of the functional layer material F, increase the amount of holes transported to the light-emitting layer 131, increase the recombination probability of holes and electrons in the light-emitting layer 131, and improve the emission efficiency. Moreover, by setting the second substitution unit IB to be connected to nitrogen, the functional layer material F has a higher triplet energy level T1, which can block the excitons in the light-emitting layer 131 from being transmitted in the direction close to the first type functional layer 132, so that more excitons can stay in the light-emitting layer 131, and the luminous efficiency of the light-emitting device 100 is effectively improved. Moreover, the third substituent group IC of the functional layer material F contains a carbazole group connected to nitrogen, which can make the functional layer material F have a deeper highest occupied molecular orbital energy level (HOMO), reducing the energy gap (GAP) that holes need to overcome when transmitting from the first type functional layer 132 to the light-emitting layer 131, which is beneficial to reducing the voltage of the light-emitting device 100, thereby reducing the power consumption of the light-emitting device 100.

[0219] It can be seen that in the light-emitting device 100 provided by the present disclosure, by providing the first type functional layer 132 containing the functional layer material F, the device life and luminous efficiency can be effectively improved, and the voltage and power consumption of the light-emitting device 100 can be effectively reduced.

[0220] Some embodiments of the present disclosure further provide a display panel 1000 , as shown in FIG2 . The display panel 1000 includes the light emitting device 100 as described in any of the above embodiments.

[0221] In some embodiments, as shown in FIG2 , the display panel 1000 includes a base substrate 200, an array layer 300 stacked on the base substrate 200, a light-emitting functional layer 400, and an encapsulation layer 500. The light-emitting functional layer 400 is located on one side of the array layer 300. The array layer 300 includes a plurality of pixel driving circuits 310, wherein the pixel driving circuits 310 include a plurality of transistors TFT. The light-emitting functional layer 400 includes a plurality of light-emitting devices 100, and the plurality of light-emitting devices 100 are arranged along a second direction Q.

[0222] 2 , multiple pixel driving circuits 310 and multiple light emitting devices 100 may be coupled in a one-to-one correspondence. In other examples, one pixel driving circuit 310 may be coupled to multiple light emitting devices 100 , or multiple pixel driving circuits 310 may be coupled to one light emitting device 100 .

[0223] For example, in the display panel 1000, the pixel driving circuit 310 can generate a driving current. Each light-emitting device 100 can emit light under the driving action of the driving current generated by the corresponding pixel driving circuit 310. The light emitted by multiple light-emitting devices 100 cooperates with each other, thereby enabling the display panel 1000 to achieve a display function.

[0224] In some embodiments, as shown in FIG3 , the plurality of light-emitting devices 100 of the display panel 1000 include a red light-emitting device 101, a green light-emitting device 102, and a blue light-emitting device 103. Under the action of a driving voltage, the red light-emitting device 101 emits red light, the green light-emitting device 102 emits green light, and the blue light-emitting device 103 emits blue light.

[0225] It should be noted that Figure 3 is a simplified schematic diagram obtained after removing the other film layers in the display panel 1000 except the film layers related to the light-emitting device 100. In Figure 3, multiple light-emitting devices 100 are, for example, a red light-emitting device 101, a green light-emitting device 102 and a blue light-emitting device 103. Each light-emitting device 100 includes its own corresponding light-emitting layer 131 and anode 120. Except for the light-emitting layer 131 and the anode 120, the other film layers are connected to form a whole for sharing.

[0226] The beneficial effects of the display panel 1000 are the same as the beneficial effects of the light-emitting device 100 provided in the above embodiment of the present disclosure, and are not described in detail here.

[0227] As shown in FIG. 4 , some embodiments of the present disclosure further provide a display device 2000 , which includes a display panel 1000 .

[0228] In some examples, the display device 2000 may be an OLED (Organic Light Emitting Diode) display device.

[0229] 4 , the display device 2000 further includes a driver chip 2100. The driver chip 2100 is used to drive the display panel 1000 to perform display.

[0230] In some examples, the driver chip 2100 is electrically connected to the display panel 1000 through a flexible circuit board and is bent to the back of the display panel 1000 along with the flexible circuit board to narrow the border of the display device 2000 and increase the display area. FIG4 shows the driver chip 2100 on the back of the display panel 1000 by dotted lines.

[0231] In addition, the display device 2000 may further include an under-screen camera and an under-screen fingerprint recognition sensor, so that the display device 2000 can realize a variety of different functions such as taking pictures, recording videos, fingerprint recognition or face recognition.

[0232] The display device 2000 can be any display device that displays either motion (e.g., video) or fixed (e.g., still images) and text or images. More specifically, it is expected that the display device 2000 of the embodiment described can be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, video cameras, game consoles, watches, clocks, calculators, television monitors, flat-panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigation systems, cockpit controls and / or displays, camera view displays (e.g., displays of rearview cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0233] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

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

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

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

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

5. The functional layer material according to any one of claims 2 to 4, wherein The functional layer material is selected from any one of the structures shown in the following general formula (III); 6. The functional layer material according to any one of claims 2 to 4, wherein The functional layer material is selected from any one of the structures shown in the following general formula (IV); 7. The functional layer material according to any one of claims 1 to 6, wherein the functional layer material is selected from any one of the structures represented by general formula (I), and the structure represented by general formula (I) contains at least one deuterium; or In the case where the functional layer material is selected from any one of the structures represented by general formula (II), the structure represented by general formula (II) contains at least one deuterium; or, When the functional layer material is selected from any one of the structures represented by general formula (III), the structure represented by general formula (III) contains at least one deuterium; or, When the functional layer material is selected from any one of the structures represented by general formula (IV), the structure represented by general formula (IV) contains at least one deuterium.

8. The functional layer material according to any one of claims 2 to 7, wherein When m is greater than 2, two adjacent R3 groups can be bonded to form a ring.

9. The functional layer material according to any one of claims 1 to 8, wherein When q is greater than 2, two adjacent R1s can be bonded to form a ring.

10. The functional layer material according to any one of claims 1 to 9, wherein When n is greater than 2, two adjacent R2 groups can be bonded to form a ring.

11. The functional layer material according to any one of claims 1 to 10, wherein The functional layer material is used to transport holes and / or block electrons.

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

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

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

15. The light emitting device according to any one of claims 12 to 14, wherein: The light-emitting layer is configured to emit blue light; the material of the light-emitting layer includes: a host material and a guest material; The main material structural formula is as follows: The structural formula of the guest material is as follows:

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

Images