Light emitting device and electronic apparatus

Abstract

The invention provides a light emitting device and electronic equipment. The light emitting device includes: a light emitting structure including at least one light emitting unit; the light-emitting unit comprises at least one light-emitting layer; the at least one light-emitting layer comprises a host material, a sensitizing material and a fluorescent dye, and the horizontal dipole proportion of the fluorescent dye is greater than or equal to 50%. And the horizontal dipole proportion of the fluorescent dye is relatively high, so that the light extraction efficiency of the light-emitting layer can be effectively improved, and the light-emitting efficiency of the light-emitting device can be further improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to light-emitting devices and electronic devices. Background Technology

[0002] Display panels, such as organic light-emitting diodes (OLEDs), are now widely used in end-user applications. However, limitations imposed by the structural characteristics of phosphorescent materials (such as long wavelengths) remain. 3 Due to limitations such as MLCT absorption and long phosphorescent transient lifetime, current performance improvements in phosphorescent photoluminescent devices face certain shortcomings. To enhance device performance, pTSF (phosphor-assisted TADF-sensitized fluorescence) technology has gained attention. This technology transfers exciton energy to a narrow-spectrum fluorescent material, causing it to emit light. It leverages the high exciton utilization of phosphorescent materials and the narrow fluorescence spectrum, improving device efficiency while maintaining a narrow emission spectrum. However, current pTSF technology still limits the performance of light-emitting devices in display panels, which requires further improvement. Summary of the Invention

[0003] In view of this, embodiments of this application provide a light-emitting device and an electronic device.

[0004] The first aspect of this application provides a light-emitting device, comprising: The light-emitting structure includes at least one light-emitting unit; the light-emitting unit includes at least one light-emitting layer; the at least one light-emitting layer includes a host material, a sensitizing material and a fluorescent dye, wherein the horizontal dipole ratio of the fluorescent dye is greater than or equal to 50%.

[0005] A second aspect of this application provides a light-emitting device, comprising: The light-emitting structure includes at least one light-emitting unit; the light-emitting unit includes at least one light-emitting layer; the at least one light-emitting layer includes a host material, a sensitizing material, and a fluorescent dye, the fluorescent dye having a structural formula as shown in Formula I: Among them, ring A1, ring A2, and ring A3 are each independently selected from any one of substituted or unsubstituted C6~C60 aromatic rings and substituted or unsubstituted C3~C60 heteroaromatic rings; X and X2 are each independently selected from N or CRG; X1 is selected from any one of the following: non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; L1 is independently selected from any one of single bond, O, S, Se, NAr1, CR8R9; when L1 is selected from single bond and m is 1, ring A1 and ring A3 are directly connected through single bond; m is selected from 0 or 1; when m is 0, L1 does not exist; Ar and Ar1 are selected from any one of unsubstituted or R'-substituted C6~C60 aryl groups and unsubstituted or R'-substituted C3~C60 heteroaryl groups; Ar is not connected to the adjacent ring structure or is connected to the adjacent ring structure through a chemical bond to form a ring; Ar1 ​​is not connected to the adjacent ring structure or is connected to the adjacent ring structure through a chemical bond to form a ring. R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from hydrogen, halogen, cyano, nitro, hydroxyl, amino, substituted or unsubstituted C1-C20 straight-chain or branched alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, and substituted or unsubstituted C6-C30. Any one of the following: arylsilyl, substituted or unsubstituted C3-C30 heteroarylsilyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C60 arylamino, substituted or unsubstituted C3-C60 heteroarylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryloxy, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; RG is independently selected from hydrogen atom, deuterium atom, fluorine atom, substituted or unsubstituted C1-C50 silyl group, substituted or unsubstituted C1-C50 alkyl group, substituted or unsubstituted C1-C50 alkoxy group, substituted or unsubstituted C1-C20 fluoroalkyl group, substituted or unsubstituted C1-C20 fluoroalkoxy group, substituted or unsubstituted cycloalkyl group with 3-50 cyclic carbon atoms, and substituted or unsubstituted aryl group with 6-50 cyclic carbon atoms. R1 is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; R2 and R3 are not connected to each other or are connected to form a ring through a chemical bond; R4 and R5 are not connected to each other or are connected to form a ring through a chemical bond; R6 and R7 are not connected to each other or are connected to form a ring through a chemical bond; R8 and R9 are not connected to each other or are connected to form a ring through a chemical bond. The substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently selected from deuterium, halogens, unsubstituted or R'-substituted C1-C20 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C20 cycloalkyl groups, unsubstituted or R'-substituted C1-C20 alkoxy groups, unsubstituted or R'-substituted C2-C20 alkenyl groups, unsubstituted or R'-substituted C1-C20 alkylsilyl groups, unsubstituted or R'-substituted C1-C20 alkylamino groups, and unsubstituted or R'-substituted groups. At least one of the following: C6-C30 arylsilyl, unsubstituted or R'-substituted C3-C30 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C3-C30 heteroarylamino, unsubstituted or R'-substituted C6-C30 aryloxy, unsubstituted or R'-substituted C3-C30 heteroaryloxy, unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl, and unsubstituted or R'-substituted C6-C30 arylthio. In rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG, the substituents are independently not connected to the adjacent ring structures or are connected to each other by chemical bonds to form a ring. At least two adjacent groups in the substituents are not connected to each other or are connected to each other by chemical bonds to form a ring. Each R' is independently selected from at least one of deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylsilyl, C3-C30 heteroarylsilyl, C6-C60 aryl, and C3-C60 heteroaryl; at least two adjacent R's are not connected or are linked by chemical bonds to form a ring; R's are not connected to adjacent ring structures or are linked by chemical bonds to form a ring.

[0006] A third aspect of this application provides an electronic device, including the aforementioned light-emitting device.

[0007] According to the light-emitting device provided in the embodiments of this application, the proportion of horizontal dipoles of the fluorescent dye is greater than or equal to 50%. The relatively high proportion of horizontal dipoles of the fluorescent dye can effectively improve the light extraction efficiency of the light-emitting layer and further improve the luminous efficiency of the light-emitting device. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a light-emitting device in one embodiment of this application.

[0009] Figure 2 This is a schematic diagram of the structure of the light-emitting device in another embodiment of this application.

[0010] Figure 3 This is a schematic diagram of the structure of the light-emitting device in another embodiment of this application.

[0011] Figure 4 This is a schematic diagram of the structure of the light-emitting device in another embodiment of this application. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods and means well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0014] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0015] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0016] The inventors of this application discovered through research that in light-emitting devices such as OLEDs and quantum dot displays, there is a difference in the matching between the radiation direction of dipoles and the optical coupling efficiency of the device. The "far-field directionality" of dipole radiation differs from the coupling probability of the "light extraction channel" of the light-emitting device. The light-emitting process of light-emitting materials (such as organic molecules and quantum dots) is essentially an electric dipole radiation transition from an excited state to the ground state—when excited-state electrons and holes recombine, the resulting "electric dipole" (which can be considered a "positive and negative charge pair") radiates electromagnetic waves (photons) into space. Electric dipoles include horizontal dipoles and vertical dipoles. The dipole moment direction of a horizontal dipole is parallel to the plane of the light-emitting layer of the light-emitting device; the dipole moment direction of a vertical dipole is perpendicular to the plane of the light-emitting layer of the light-emitting device. The radiation directionality of horizontal dipoles is highly matched to the light extraction channel of light-emitting devices, and the probability of exciting loss modes is low, resulting in an external coupling efficiency of 40-50%. In contrast, the radiation direction of vertical dipoles does not match the light extraction channel, and a large amount of energy is lost in surface plasmon polariton (SPP) modes and waveguide modes, resulting in an external coupling efficiency of only 10-15%. Therefore, it is necessary to increase the proportion of horizontal dipoles in the light-emitting material of light-emitting devices.

[0017] In view of the above, the first aspect of this application provides a light-emitting device, referring to... Figure 1 The diagram shows the structure of the light-emitting device, which includes a light-emitting structure 100.

[0018] Optionally, the light-emitting structure 100 includes at least one light-emitting unit 110; the light-emitting unit 110 includes at least one light-emitting layer 111; the at least one light-emitting layer 111 includes a host material, a sensitizing material, and a fluorescent dye, wherein the horizontal dipole ratio of the fluorescent dye is greater than or equal to 50%, for example, it can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%, etc. According to the light-emitting device provided in the embodiments of this application, the horizontal dipole ratio of the fluorescent dye is greater than or equal to 50%, which is relatively high and can effectively improve the light extraction efficiency of the light-emitting layer 111, thereby further improving the luminous efficiency of the light-emitting device.

[0019] It should be noted that in this application, the direction of the horizontal dipole moment is parallel to the plane where the light-emitting layer 111 is located.

[0020] For example, the level dipole ratio of the fluorescent dye is greater than or equal to 70%. For example, the level dipole ratio of the fluorescent dye is greater than or equal to 75%. For example, the level dipole ratio of the fluorescent dye is greater than or equal to 80%.

[0021] For example, the dual host, sensitizer, and fluorescent dye in the luminescent layer, by constructing a ternary system, helps to maximize exciton utilization and synergistically optimize the orientation of luminescent dipoles. This achieves the dual goals of efficient multi-channel energy transfer from the host and sensitizer to the fluorescent dye, and improved light extraction efficiency of the fluorescent dye. The host and sensitizer must serve the goal of efficient energy transfer from the host and sensitizer to the fluorescent dye, while the fluorescent dye needs to increase the proportion of horizontal dipoles to serve the goal of efficient photon coupling output. The combination of the host, sensitizer, and fluorescent dye improves the horizontal dipole orientation of the fluorescent dye, thereby enhancing the luminous efficiency of the light-emitting device.

[0022] For example, if the sensitizing material has a certain proportion of horizontal dipoles and the direction of the dipole moment is parallel to the plane of the emitting layer 111, and the fluorescent dye has a certain proportion of horizontal dipoles and the direction of the dipole moment is parallel to the plane of the emitting layer 111, the π-π conjugate plane overlap area between the sensitizing material and the fluorescent dye is large, the electron cloud coupling is strong, and the Foster energy transfer efficiency is high.

[0023] For example, the horizontal dipole ratio of the sensitizing material needs to balance energy transfer efficiency with its own energy loss. If the sensitizing material has a certain horizontal dipole ratio, its surface plasmon mode loss in its excited state is lower, which can reduce energy loss before transfer and allow more energy to be transferred to the fluorescent dye. In one embodiment, the horizontal dipole ratio of the sensitizing material is greater than or equal to 50% and less than or equal to 80%, for example, it can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. Thus, the relatively high horizontal dipole ratio of the sensitizing material is beneficial for transferring energy to the fluorescent dye, and the relatively low energy loss of the sensitizing material itself before energy transfer allows more energy to be transferred to the fluorescent dye.

[0024] For example, the sensitizing material has a horizontal dipole ratio greater than or equal to 70% and less than or equal to 80%.

[0025] In one embodiment, the horizontal dipole ratio of the light-emitting layer 111 is greater than or equal to 50%, for example, it can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%. The horizontal dipole ratio of the light-emitting layer 111 is the overall horizontal dipole ratio presented by the interaction between the host material, the sensitizing material, and the fluorescent dye. Therefore, the relatively high horizontal dipole ratio of the light-emitting layer 111 is beneficial for achieving efficient escape of radiated photons and improving the luminous efficiency of the light-emitting device.

[0026] In one embodiment, the horizontal dipole ratio of the fluorescent dye is greater than or equal to the horizontal dipole ratio of the fluorescent dye in the sensitizing material. Thus, the sensitizing material transfers energy to the fluorescent dye via Foster energy transfer and Dexter energy transfer to produce light emission. A higher horizontal dipole ratio in the fluorescent dye is more beneficial for improving device efficiency.

[0027] It is understandable that the horizontal dipole ratio of sensitizing materials can also be greater than that of fluorescent dyes.

[0028] For example, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 50%, such as 50%, 60%, 70%, 80%, 90%, or 100%.

[0029] For example, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 70%.

[0030] For example, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 75%.

[0031] For example, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 80%.

[0032] In one embodiment, the full width at half maximum (FWHM) of the fluorescent dye is less than 40 nm, for example, it can be 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, or 5 nm. Therefore, the narrow FWHM of the fluorescent dye allows the energy of the material with a wider FWHM in the luminescent layer 111 to be transferred to the fluorescent dye with a narrow spectrum to achieve luminescence. This results in excellent improvement in the luminous efficiency and color purity of the light-emitting device, significantly enhancing its performance.

[0033] For example, the full width at half maximum (FWHM) of the fluorescent dye is less than 30 nm.

[0034] In one embodiment, the fluorescent dye comprises the structural formula shown in Formula I: Formula I. In this formula, rings A1, A2, and A3 are each independently selected from any one of substituted or unsubstituted C6-C60 aromatic rings or substituted or unsubstituted C3-C60 heteroaromatic rings; X and X2 are each independently selected from N or CRG; X1 is selected from any one of the following: non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; L1 is each independently selected from any one of the following: single bond, O, S, Se, NAr1, CR8R9; when L1 is selected from a single bond and m is 1, rings A1 and A3 are directly connected by a single bond. m is selected from 0 or 1; when m is 0, L1 does not exist; Ar and Ar1 are selected from any one of unsubstituted or R'-substituted C6~C60 aryl groups, and unsubstituted or R'-substituted C3~C60 heteroaryl groups; Ar is not connected to the adjacent ring structure or is connected to the ring structure by a chemical bond; Ar1 ​​is not connected to the adjacent ring structure or is connected to the ring structure by a chemical bond; R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from hydrogen, halogen, cyano, nitro, hydroxyl, amino, substituted or unsubstituted C1~C20 straight-chain or branched alkyl groups, substituted or unsubstituted... Substituted C2-C20 alkenyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C3-C30 heteroarylsilyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C60 arylamino, substituted or unsubstituted C3-C60 heteroarylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryloxy, etc. The following are the possible selections: substituted or unsubstituted C6-C60 aryl groups and substituted or unsubstituted C3-C60 heteroaryl groups; RG is independently selected from hydrogen, deuterium, fluorine, substituted or unsubstituted C1-C50 silyl groups, substituted or unsubstituted C1-C50 alkyl groups, substituted or unsubstituted C1-C50 alkoxy groups, substituted or unsubstituted C1-C20 fluoroalkyl groups, substituted or unsubstituted C1-C20 fluoroalkoxy groups, substituted or unsubstituted cycloalkyl groups with 3-50 carbon atoms, and substituted or unsubstituted aryl groups with 6-50 carbon atoms; R1 is not connected to the adjacent ring structure or is linked to it by a chemical bond; R2 and R3 are not connected to each other or are linked to each other by a chemical bond; R4 and R5 are not connected to each other or are linked to each other by a chemical bond; R6 and R7 are not connected to each other or are linked to each other by a chemical bond; R8 and R9 are not connected to each other or are linked to each other by a chemical bond.The substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently selected from deuterium, halogens, unsubstituted or R'-substituted C1-C20 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C20 cycloalkyl groups, unsubstituted or R'-substituted C1-C20 alkoxy groups, unsubstituted or R'-substituted C2-C20 alkenyl groups, unsubstituted or R'-substituted C1-C20 alkylsilyl groups, and unsubstituted or R'-substituted C1-C20 alkylamino groups. Unsubstituted or R'-substituted C6-C30 arylsilyl groups, unsubstituted or R'-substituted C3-C30 heteroarylsilyl groups, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C30 arylamino groups, unsubstituted or R'-substituted C3-C30 heteroarylamino groups, unsubstituted or R'-substituted C6-C30 aryloxy groups, unsubstituted or R'-substituted C3-C30 heteroaryloxy groups, unsubstituted or R'-substituted C6-C60 aryl groups, unsubstituted or R'-substituted C3-C60 heteroaryl groups, unsubstituted or R'-substituted At least one of C6-C30 arylthiols; the substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently not connected to adjacent ring structures or connected to form a ring by chemical bonds, and at least two adjacent substituents are not connected to each other or are connected to form a ring by chemical bonds; R' is independently selected from deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C2-C20 alkenyl, C3-C2 At least one of the following: C1-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylsilyl, C3-C30 heteroarylsilyl, C6-C60 aryl, and C3-C60 heteroaryl; at least two adjacent R's are not connected to each other or are linked by chemical bonds to form a ring; R's are not connected to adjacent ring structures or are linked by chemical bonds to form a ring.

[0035] For example, in the structural formula shown in Formula I, the group X1 locks the two units of the molecule into a rigid plane, which can effectively suppress the vibrational relaxation of the molecule in the excited state, improve the luminescence efficiency and narrow the half-width at half-maximum.

[0036] In one embodiment, the fluorescent dye comprises at least one of the structural formulas shown in Formula II-1 and Formula II-2: Wherein, X has the same limiting range as X in Formula I; X1 has the same limiting range as X1 in Formula I; X2 has the same limiting range as X2 in Formula I; X3 is selected from any one of non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; R1 has the same limiting range as R1 in Formula I; R2 has the same limiting range as R2 in Formula I; R3 has the same limiting range as R3 in Formula I; R4 has the same limiting range as R4 in Formula I; R5 has R5 has the same limiting range as R5 in Formula I; R6 has the same limiting range as R6 in Formula I; R7 has the same limiting range as R7 in Formula I; Z1, Z2, Z3, Z4, Z5 and Z6 are each independently selected from CRB or N; Y1, Y2, Y3, Y4, Y5 and Y6 are each independently selected from CRA or N; RB and RA are each independently selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1~C20 straight-chain or branched alkyl, unsubstituted or R'-substituted C3~C20 cycloalkyl, unsubstituted or R'-substituted Substituted C1-C20 alkoxy, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C3-C30 heteroarylsilyl, cyano, nitro, hydroxy, amino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C3-C30 heteroarylamino, unsubstituted or R'-substituted C6-C30 aryloxy The following are all of the following: unsubstituted or R'-substituted C3-C30 heteroaryl groups, unsubstituted or R'-substituted C6-C60 aryl groups, unsubstituted or R'-substituted C3-C60 heteroaryl groups, and unsubstituted or R'-substituted C6-C30 arylthio groups; RB and RA are independently not connected to adjacent ring structures or are connected to each other by chemical bonds to form a ring, any two adjacent RBs are not connected to each other or are connected to each other by chemical bonds to form a ring, and any two adjacent RAs are not connected to each other or are connected to each other by chemical bonds to form a ring; R' has the same limiting range as R' in Formula I.

[0037] Optionally, RA is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C10 straight-chain or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C1-C10 alkoxy, unsubstituted or R'-substituted C2-C10 alkenyl, unsubstituted or R'-substituted C1-C10 alkylsilyl, unsubstituted or R'-substituted C1-C10 alkylamino, unsubstituted or R'-substituted C6-C20 arylsilyl, and unsubstituted or R'-substituted C The group consists of any one of the following: 3-C20 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C20 arylamino, unsubstituted or R'-substituted C3-C20 heteroarylamino, unsubstituted or R'-substituted C6-C20 aryloxy, unsubstituted or R'-substituted C3-C20 heteroaryloxy, unsubstituted or R'-substituted C6-C30 aryl, unsubstituted or R'-substituted C3-C30 heteroaryl, and unsubstituted or R'-substituted C6-C20 arylthio. For example, RA is selected from any one of hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C5 straight-chain or branched alkyl, unsubstituted or R'-substituted C2-C5 alkenyl, unsubstituted or R'-substituted C1-C5 alkylsilyl, cyano, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl.

[0038] Optionally, RB is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C10 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C10 cycloalkyl groups, unsubstituted or R'-substituted C1-C10 alkoxy groups, unsubstituted or R'-substituted C2-C10 alkenyl groups, unsubstituted or R'-substituted C1-C10 alkylsilyl groups, unsubstituted or R'-substituted C1-C10 alkylamino groups, unsubstituted or R'-substituted C6-C20 arylsilyl groups, and unsubstituted or R'-substituted C6-C20 arylsilyl groups. Any one of the following: 3~C20 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6~C20 arylamino, unsubstituted or R'-substituted C3~C20 heteroarylamino, unsubstituted or R'-substituted C6~C20 aryloxy, unsubstituted or R'-substituted C3~C20 heteroaryloxy, unsubstituted or R'-substituted C6~C30 aryl, unsubstituted or R'-substituted C3~C30 heteroaryl, and unsubstituted or R'-substituted C6~C20 arylthio. For example, RB is selected from any one of hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C5 straight-chain or branched alkyl, unsubstituted or R'-substituted C2-C5 alkenyl, unsubstituted or R'-substituted C1-C5 alkylsilyl, cyano, unsubstituted or R'-substituted C6-C15 arylamino, unsubstituted or R'-substituted C3-C15 heteroarylamino, unsubstituted or R'-substituted C6-C15 aryloxy, unsubstituted or R'-substituted C3-C15 heteroaryloxy, unsubstituted or R'-substituted C6-C20 aryl, unsubstituted or R'-substituted C3-C20 heteroaryl, and unsubstituted or R'-substituted C6-C15 arylthio.

[0039] In one embodiment, the fluorescent dye has at least one of the structural formulas shown in formulas M001 to M252: 。

[0040] In one embodiment, the sensitizing material includes a metal M and complexes La, Lb, and Lc. The general formula of the metal complex is M(La)p(Lb)n(Lc)q. Wherein, La is the first ligand coordinated with metal M, Lb is the second ligand coordinated with metal M, and Lc is the third ligand coordinated with metal M. La, Lb, and Lc may be the same or different, and La, Lb, and Lc can optionally be linked to form a polydentate ligand. Metal M is selected from metals with a relative atomic mass greater than or equal to 40 (e.g., 40, 50, 60, 70, 80, 90, or 100, etc.); p is selected from 1, 2, or 3; n is selected from 0, 1, or 2; q is selected from 0, 1, or 2; p +n+q equals the oxidation state of metal M; when p is greater than or equal to 2, multiple Las may be the same or different; when n equals 2, two Lbs may be the same or different; when q equals 2, two Lcs may be the same or different; Lb is selected from at least one of O, S, Se, NRN1, and CRC1RC2; Lc and Ld are each independently selected from at least one of O, S, Se, and NRN2; RN1, RN2, RC1, and RC2 are each independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl with 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic with 3-20 ring atoms, substituted or unsubstituted The C7-C30 aralkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aroxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl groups are all present in the group.

[0041] Optionally, the metal M includes at least one of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir, and Pt. For example, the metal M is selected from Pt or Ir.

[0042] Optionally, any adjacent substituents among RN1, RN2, RC1, and RC2 can be linked to form a ring.

[0043] It is understandable that p is selected from 1, 2 or 3; when p is selected from 2 or 3, multiple La are the same or different; n is selected from 1, 2 or 3; when n is selected from 2 or 3, multiple Lb are the same or different; q is selected from 1, 2 or 3; when q is selected from 2 or 3, multiple Lc are the same or different.

[0044] In one embodiment, the metal complex has a structural formula as shown in formula Ma: Formula Ma.

[0045] In formula Ma, ring A4 is selected from a heteroaromatic ring having 5 to 30 ring atoms; ring A5 is selected from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; U1 to U8 are each independently selected from CRu or N; R 10 and R 11 Each can be used independently to indicate monosubstituted, polysubstituted, or unsubstituted; R 10 R 11 Each of the elements, Ru, is independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having 3-20 ring atoms, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted At least one of the following: substituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl; when ring A4 is selected from a pyridine ring and ring A5 is selected from a benzene ring, and R 10 and R 11 At least one of the following is selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having 3-20 ring atoms, substituted or unsubstituted C7-C30 arylalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, or substituted or unsubstituted C2-C20 alkyne. When at least one of the following groups is selected: alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphine; the adjacent substituent R 10 R11 Ru can be optionally connected to form a ring.

[0046] In one embodiment, the sensitizing material comprises at least one of the structural formulas shown as PGD-1 to PGD-71: ; where D represents deuterium.

[0047] In one embodiment, the singlet energy level of the host material is higher than the triplet energy level of the sensitizer material; the triplet energy level of the host material is higher than the triplet energy level of the sensitizer material. This avoids energy backflow, improves the energy transfer efficiency from the host material to the sensitizer material, ensures the integrity of energy transfer, suppresses nonradiative recombination losses, maximizes internal quantum efficiency, and optimizes charge transport and exciton formation, thereby improving device stability.

[0048] Optionally, the sensitizing material includes phosphorescent materials.

[0049] Optionally, the host material includes a first host material and a second host material, which form an excitocomplex. The singlet energy level of the excitocomplex is higher than the triplet energy level of the phosphorescent material.

[0050] Optionally, the singlet energy level of the exciton complex is higher than the triplet energy level of the fluorescent dye, and the triplet energy level of the exciton complex is higher than the triplet energy level of the fluorescent dye. This allows for efficient energy transfer from the excited state of the exciton complex to the fluorescent dye, avoiding energy backflow; suppressing non-radiative losses of the exciton complex and leveraging the high radiative efficiency of the fluorescent dye; and optimizing exciton formation and the lifetime of the light-emitting device.

[0051] In one embodiment, the first host material is a hole-transporting host material, the second host material is an electron-transporting host material, and the singlet energy level S1 of the first host material is... P The singlet energy level S1 of the second host material N The singlet energy level S1 of the excitocomplex EX Satisfy the following relationship: S1 P>S1 N ≥S1 EX ; and / or, the singlet energy level S1 of the excitocomplex EX triplet energy level T1 of the excitocomplex EX The following relationship must be satisfied: 0 < S1 EX -T1 EX ≤0.3eV. For example, S1 EX -T1 EX The value can be 0.1eV, 0.15eV, 0.2eV, 0.25eV or 0.3eV, etc.

[0052] Optionally, the highest occupied orbit E of the hole-transmitting type subject HOMO P and the lowest empty orbit E LUMO P The highest occupied orbit E of the electron transmission body HOMO N and the lowest empty orbit E LUMO N Satisfy: E HOMO P >E HOMO N E LUMO P >E LUMO N .

[0053] For example, E HOMO P -E HOMO N >0.1 eV (e.g., 0.1 eV, 0.2 eV, 0.3 eV, or 0.4 eV, etc.), and / or, E LUMO P -E LUMO N >0.3eV (e.g., 0.3eV, 0.4eV, 0.5eV, or 0.6eV, etc.).

[0054] Optionally, the triplet energy level of the phosphorescent material is higher than the singlet energy level of the fluorescent dye, and / or, the triplet energy level of the phosphorescent material is higher than the triplet energy level of the fluorescent dye. This allows for the construction of multi-path energy transfer channels, enabling efficient and directional energy transfer from the phosphorescent photosensitive material to the fluorescent dye, while simultaneously maximizing the excited-state population and offering flexibility in spectral modulation.

[0055] In one embodiment, the first body material comprises a structure as shown in Formula VI: Formula VI, where Ar 1Selected from one of substituted or unsubstituted C6-C60 aryl groups and substituted or unsubstituted C3-C60 heteroaryl groups; R 001 and R 002 R represents the maximum number of substituents allowed on the benzene ring, from zero to the most permissible substituents. 001 and R 002 Each is independently selected from one of the following: deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl.

[0056] Optionally, the first body material includes at least one of the structural formulas shown in Formulas IV-1 to IV-3: Where a is an integer between 1 and 4; b is an integer between 1 and 4; c is 1 or 2; Ar 2 Ar 3 Ar 4 Ar 5 Ar 6 Each is independently selected from one of substituted or unsubstituted C6-C60 aryl groups or substituted or unsubstituted C3-C60 heteroaryl groups; R 003 ~R 013 This indicates the number of substituents on the benzene ring that are unsubstituted or at most permissible, each independently selected from one of the following: hydrogen, deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 arylalkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; preferably, Ar 2 Ar 3 Ar 4 Ar 5 Ar 6 Each of the following is independently selected from at least one of substituted or unsubstituted benzene, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted triphenylene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted indole, substituted or unsubstituted indolocarbazole, substituted or unsubstituted carbazole, and substituted or unsubstituted fluorene.

[0057] Optionally, the first host material comprises at least one of the compounds shown in Formulas D-1 to D-111: .

[0058] In one embodiment, the second host material comprises a nitrogen-containing aromatic heterocyclic compound.

[0059] Optionally, the second body material includes a structure as shown in Formula V: Formula V, where Q1 to Q5 are each independently selected from nitrogen or CR. 014 R 014 Independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C60 arylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; adjacent R 014 Connect or not connect.

[0060] Optionally, the second body material includes at least one of the structural formulas shown in Formulas A1 to A127: .

[0061] In one embodiment, the mass of the sensitizing material accounts for 0.1-50% of the total mass of the corresponding luminescent layer (e.g., 0.1%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%), and the mass of the fluorescent dye accounts for 0.1-30% of the total mass of the corresponding luminescent layer (e.g., 0.1%, 1%, 5%, 10%, 15%, 20%, 25%, or 30%).

[0062] For example, the mass of the sensitizing material accounts for 0.1-30% of the total mass of the corresponding luminescent layer.

[0063] For example, the mass of the sensitizing material accounts for 0.1-20% of the total mass of the corresponding luminescent layer.

[0064] For example, the mass of the fluorescent dye accounts for 0.1-10% of the total mass of the corresponding luminescent layer.

[0065] For example, the mass of the fluorescent dye accounts for 0.1-5% of the total mass of the corresponding luminescent layer.

[0066] For example, refer to Figure 1 The light-emitting device includes a first electrode 200 and a second electrode 300, for example, the first electrode 200 is an anode and the second electrode 300 is a cathode.

[0067] In one embodiment, refer to Figure 2 The number of light-emitting units 110 is multiple (e.g., the number of light-emitting units 110 can be 2, 3, 4, or 5, etc.). The light-emitting structure 100 also includes a charge-generating layer 120 located between adjacent light-emitting units 110. The charge-generating layer 120 includes an n-type charge-generating layer and a p-type charge-generating layer, with the n-type charge-generating layer located on the side of the p-type charge-generating layer closer to the first electrode 200. It can be understood that the light-emitting layer 111 in at least one of the multiple light-emitting units 110 includes the fluorescent dye as described above.

[0068] Optionally, refer to Figure 3 The light-emitting unit 110 includes a hole transport layer 112, an electron blocking layer 113, a light-emitting layer 111, a hole blocking layer 114, and an electron transport layer 115 stacked along a direction away from the substrate 100.

[0069] For example, refer to Figure 4 The light-emitting structure also includes a hole injection layer 130 and an electron injection layer 140. The hole injection layer 130 is located on the side of the first electrode 200 near the light-emitting unit 110; the electron injection layer 140 is located on the side of the second electrode 300 near the light-emitting unit 110. For example, there are multiple light-emitting units, which are stacked along the direction from the first electrode 200 to the second electrode 300. Along the direction from the first electrode 200 to the second electrode 300, the hole injection layer 130 is located between the hole transport layer 112, which is closest to the first electrode 200, and the first electrode 200; the electron injection layer 140 is located between the electron transport layer 115, which is closest to the second electrode 300, and the second electrode 300.

[0070] Optionally, in each light-emitting unit 110, the light-emitting layer includes multiple sub-light-emitting layers, and the material of at least one sub-light-emitting layer includes a fluorescent dye.

[0071] A second aspect of this application provides a light-emitting device, as shown in the reference... Figure 1 The diagram shows the structure of the light-emitting device, which includes a light-emitting structure 100.

[0072] Optionally, the light-emitting structure 100 includes at least one light-emitting unit 110; the light-emitting unit 110 includes at least one light-emitting layer 111; the at least one light-emitting layer 111 includes a host material, a sensitizing material, and a fluorescent dye.

[0073] It is understandable that the main material, sensitizing material, and fluorescent dye can be consistent with the previous description, and will not be elaborated further here.

[0074] Optionally, the fluorescent dye comprises a structure as shown in Formula I: Formula I Among them, rings A1, A2, and A3 are each independently selected from any one of substituted or unsubstituted C6~C60 aromatic rings and substituted or unsubstituted C3~C60 heteroaromatic rings; X and X2 are each independently selected from N or CRG; X1 is selected from any one of non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, and GeR6R7; L1 is each independently selected from any one of single bond, O, S, Se, NAr1, and CR8R9; when L1 is selected from single bond and m is 1, rings A1 and A3 are directly connected by a single bond; m is selected from 0 or 1; when m is 0, L1 does not exist; Ar and Ar1 are selected from Any one of unsubstituted or R'-substituted C6-C60 aryl groups, or unsubstituted or R'-substituted C3-C60 heteroaryl groups; Ar is not connected to the adjacent ring structure or is linked to form a ring by a chemical bond; Ar1 ​​is not connected to the adjacent ring structure or is linked to form a ring by a chemical bond; R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from hydrogen, halogen, cyano, nitro, hydroxyl, amino, substituted or unsubstituted C1-C20 straight-chain or branched alkyl groups, substituted or unsubstituted C2-C20 alkenyl groups, substituted or unsubstituted C3-C20 cycloalkyl groups, substituted or unsubstituted C1-C20 alkoxy groups, substituted or unsubstituted C 1~C20 alkylsilyl, substituted or unsubstituted C6~C30 arylsilyl, substituted or unsubstituted C3~C30 heteroarylsilyl, substituted or unsubstituted C1~C20 alkylamino, substituted or unsubstituted C6~C60 arylamino, substituted or unsubstituted C3~C60 heteroarylamino, substituted or unsubstituted C6~C30 aryloxy, substituted or unsubstituted C3~C30 heteroaryloxy, substituted or unsubstituted C6~C60 aryl, substituted or unsubstituted C3~C60 heteroaryl; RG is independently selected from hydrogen atom, deuterium atom, fluorine atom, substituted or unsubstituted C1~C50 silyl, substituted or Unsubstituted C1-C50 alkyl, substituted or unsubstituted C1-C50 alkoxy, substituted or unsubstituted C1-C20 fluoroalkyl, substituted or unsubstituted C1-C20 fluoroalkoxy, substituted or unsubstituted cycloalkyl with 3-50 carbon atoms, substituted or unsubstituted aryl with 6-50 carbon atoms; R1 is not connected to the adjacent ring structure or is connected to it by a chemical bond; R2 and R3 are not connected to each other or are connected to each other by a chemical bond; R4 and R5 are not connected to each other or are connected to each other by a chemical bond; R6 and R7 are not connected to each other or are connected to each other by a chemical bond; R8 and R9 are not connected to each other or are connected to each other by a chemical bond.The substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently selected from deuterium, halogens, unsubstituted or R'-substituted C1-C20 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C20 cycloalkyl groups, unsubstituted or R'-substituted C1-C20 alkoxy groups, unsubstituted or R'-substituted C2-C20 alkenyl groups, unsubstituted or R'-substituted C1-C20 alkylsilyl groups, and unsubstituted or R'-substituted C1-C20 alkylamino groups. Unsubstituted or R'-substituted C6-C30 arylsilyl groups, unsubstituted or R'-substituted C3-C30 heteroarylsilyl groups, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C30 arylamino groups, unsubstituted or R'-substituted C3-C30 heteroarylamino groups, unsubstituted or R'-substituted C6-C30 aryloxy groups, unsubstituted or R'-substituted C3-C30 heteroaryloxy groups, unsubstituted or R'-substituted C6-C60 aryl groups, unsubstituted or R'-substituted C3-C60 heteroaryl groups, unsubstituted or R'-substituted At least one of C6-C30 arylthiols; the substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently not connected to adjacent ring structures or connected to form a ring by chemical bonds, and at least two adjacent substituents are not connected to each other or are connected to form a ring by chemical bonds; R' is independently selected from deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C2-C20 alkenyl, C3-C2 At least one of the following: C1-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylsilyl, C3-C30 heteroarylsilyl, C6-C60 aryl, and C3-C60 heteroaryl; at least two adjacent R's are not connected to each other or are linked by chemical bonds to form a ring; R's are not connected to adjacent ring structures or are linked by chemical bonds to form a ring.

[0075] In one embodiment, the fluorescent dye comprises at least one of the structural formulas shown in Formula II-1 and Formula II-2: Wherein, X has the same limiting range as X in Formula I; X1 has the same limiting range as X1 in Formula I; X2 has the same limiting range as X2 in Formula I; X3 is selected from any one of non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; R1 has the same limiting range as R1 in Formula I; R2 has the same limiting range as R2 in Formula I; R3 has the same limiting range as R3 in Formula I; R4 has the same limiting range as R4 in Formula I; R5 has R5 has the same limiting range as R5 in Formula I; R6 has the same limiting range as R6 in Formula I; R7 has the same limiting range as R7 in Formula I; Z1, Z2, Z3, Z4, Z5 and Z6 are each independently selected from CRB or N; Y1, Y2, Y3, Y4, Y5 and Y6 are each independently selected from CRA or N; RB and RA are each independently selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1~C20 straight-chain or branched alkyl, unsubstituted or R'-substituted C3~C20 cycloalkyl, unsubstituted or R'-substituted Substituted C1-C20 alkoxy, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C3-C30 heteroarylsilyl, cyano, nitro, hydroxy, amino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C3-C30 heteroarylamino, unsubstituted or R'-substituted C6-C30 aryloxy The following are all of the following: unsubstituted or R'-substituted C3-C30 heteroaryl groups, unsubstituted or R'-substituted C6-C60 aryl groups, unsubstituted or R'-substituted C3-C60 heteroaryl groups, and unsubstituted or R'-substituted C6-C30 arylthio groups; RB and RA are independently not connected to adjacent ring structures or are connected to each other by chemical bonds to form a ring, any two adjacent RBs are not connected to each other or are connected to each other by chemical bonds to form a ring, and any two adjacent RAs are not connected to each other or are connected to each other by chemical bonds to form a ring; R' has the same limiting range as R' in Formula I.

[0076] Optionally, RA is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C10 straight-chain or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C1-C10 alkoxy, unsubstituted or R'-substituted C2-C10 alkenyl, unsubstituted or R'-substituted C1-C10 alkylsilyl, unsubstituted or R'-substituted C1-C10 alkylamino, unsubstituted or R'-substituted C6-C20 arylsilyl, and unsubstituted or R'-substituted C The 3-C20 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C20 arylamino, unsubstituted or R'-substituted C3-C20 heteroarylamino, unsubstituted or R'-substituted C6-C20 aryloxy, unsubstituted or R'-substituted C3-C20 heteroaryloxy, unsubstituted or R'-substituted C6-C30 aryl, unsubstituted or R'-substituted C3-C30 heteroaryl, and unsubstituted or R'-substituted C6-C20 arylthio. For example, RA is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C5 straight-chain or branched alkyl, unsubstituted or R'-substituted C2-C5 alkenyl, unsubstituted or R'-substituted C1-C5 alkylsilyl, cyano, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl. Optionally, RB is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C10 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C10 cycloalkyl groups, unsubstituted or R'-substituted C1-C10 alkoxy groups, unsubstituted or R'-substituted C2-C10 alkenyl groups, unsubstituted or R'-substituted C1-C10 alkylsilyl groups, unsubstituted or R'-substituted C1-C10 alkylamino groups, unsubstituted or R'-substituted C6-C20 arylsilyl groups, and unsubstituted or R'-substituted C6-C20 arylsilyl groups. Any one of the following: 3~C20 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6~C20 arylamino, unsubstituted or R'-substituted C3~C20 heteroarylamino, unsubstituted or R'-substituted C6~C20 aryloxy, unsubstituted or R'-substituted C3~C20 heteroaryloxy, unsubstituted or R'-substituted C6~C30 aryl, unsubstituted or R'-substituted C3~C30 heteroaryl, and unsubstituted or R'-substituted C6~C20 arylthio. For example, RB is selected from any one of hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C5 straight-chain or branched alkyl, unsubstituted or R'-substituted C2-C5 alkenyl, unsubstituted or R'-substituted C1-C5 alkylsilyl, cyano, unsubstituted or R'-substituted C6-C15 arylamino, unsubstituted or R'-substituted C3-C15 heteroarylamino, unsubstituted or R'-substituted C6-C15 aryloxy, unsubstituted or R'-substituted C3-C15 heteroaryloxy, unsubstituted or R'-substituted C6-C20 aryl, unsubstituted or R'-substituted C3-C20 heteroaryl, and unsubstituted or R'-substituted C6-C15 arylthio.

[0077] In one embodiment, the sensitizing material comprises a metal complex, the general formula of which is: M(La)p(Lb)n(Lc)q; wherein La is a first ligand coordinated with metal M, Lb is a second ligand coordinated with metal M, and Lc is a third ligand coordinated with metal M; La, Lb, and Lc may be the same or different, and La, Lb, and Lc may optionally be linked to form a polydentate ligand; metal M is selected from metals with a relative atomic mass greater than or equal to 40; p is selected from 1, 2, or 3; n is selected from 0, 1, or 2; q is selected from 0, 1, or 2; and p + n + q equals the oxidation state of metal M; when p When n is greater than or equal to 2, multiple Las may be identical or different; when n equals 2, two Lbs may be identical or different; when q equals 2, two Lcs may be identical or different; Lb is selected from at least one of O, S, Se, NRN1, and CRC1RC2; Lc and Ld are each independently selected from at least one of O, S, Se, and NRN2; RN1, RN2, RC1, and RC2 are each independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having 3-20 ring atoms, and substituted or unsubstituted C7-C30 aromatic. At least one of the following: alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl.

[0078] It should be noted that the metal complexes are consistent with the previous description, and will not be elaborated further here.

[0079] Optionally, the main material includes a first main material and a second main material, wherein the first main material includes a structure as shown in Formula VI: Formula VI, where Ar 1 Selected from one of substituted or unsubstituted C6-C60 aryl groups and substituted or unsubstituted C3-C60 heteroaryl groups; R 001 and R 002 R represents the maximum number of substituents allowed on the benzene ring, from zero to the most permissible substituents. 001 and R 002Each is independently selected from one of the following: deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl.

[0080] Optionally, the second host material includes a nitrogen-containing aromatic heterocyclic compound.

[0081] For example, the second body material includes a structure as shown in Formula V: Formula V, where Q1 to Q5 are each independently selected from nitrogen or CR. 014 R 014 Independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C60 arylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; adjacent R 014 Connect or not connect.

[0082] It should be noted that the first and second main materials are consistent with the previous descriptions, and will not be repeated here.

[0083] It should be noted that this embodiment can be combined with the embodiments described above in whole or in part, and will not be elaborated further here.

[0084] A third aspect of this application provides an electronic device that includes the aforementioned light-emitting device.

[0085] For example, electronic devices include mobile phones, tablets, laptops, desktop monitors, televisions, advertising screens, industrial control touch screens, in-vehicle central control screens, dashboards, head-up displays (HUDs), smartwatches, wristbands, AR / VR headsets, etc. In addition to the aforementioned light-emitting devices, electronic devices may also include the structures that conventional electronic devices should possess, such as casings and batteries, which will not be elaborated upon further here.

[0086] The present application will be further described below with reference to specific embodiments. It should be noted that the following embodiments are only used to explain the present application and should not be construed as limiting the present application.

[0087] It should be noted that, unless otherwise specified, the current efficiency and lifetime testing procedures in the following embodiments and comparative examples are performed according to the following steps: 1. Current efficiency test: The current efficiency of the light-emitting devices provided in the examples and comparative examples was measured using a digital source meter and a PR650. Specifically, the voltage was increased at a rate of 0.1 V per second until the brightness of the light-emitting device reached 10000 cd / m². 2 At this time, the current efficiency (CE) of the light-emitting device can be directly measured on the PR650.

[0088] After measuring the current efficiency (CE) of the light-emitting devices in each embodiment and comparative example, the ratio of the measured current efficiency of the light-emitting devices in each embodiment and comparative example to the current efficiency of the device in Comparative Example 1 was calculated as the efficiency ratio.

[0089] 2. LT95 lifespan test: Using a luminance meter at 20000 cd / m² 2 At the set brightness level, maintaining a constant current, the brightness of the light-emitting device decreased to 19000 cd / m². 2 The time elapsed is in hours. The lifetime of the light-emitting devices in the other embodiments and comparative examples is compared as a percentage to the lifetime of LT95 in Comparative Example 1, using the LT95 lifetime of Comparative Example 1 as a baseline.

[0090] 3. Horizontal dipole ratio test: Angle-resolved photoluminescence (ARPR) measurement was performed using a Fuxing Chemical / R1-OLED angle-resolved spectrometer. The sample was a luminescent thin film (50 nm thick) prepared by vacuum evaporation of the luminescent layer material used in the various embodiments or comparative examples, with a quartz glass substrate. The sample was placed on a sample stage, and the excitation light source was at a wavelength of 365 nm. The intensity variation of p-polarized light at an angle of 0° to 90° with respect to the sample surface was collected. The data were fitted to obtain the horizontal dipole ratio of the sample (range 0% to 100%, with higher values ​​indicating a higher proportion of horizontal dipoles).

[0091] Example 1 The light-emitting device is a top-emitting single-layer device, and its fabrication method is as follows: (1) The top-emitting substrate coated with ITO conductive layer (anode) was ultrasonically treated in commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in a mixed solvent of acetone and ethanol, baked in a clean environment until all moisture was removed, cleaned with ultraviolet light and ozone, and bombarded with low-energy cation beam.

[0092] (2) Place the top-emitting substrate with the ITO conductive layer into a vacuum chamber and evacuate it to a vacuum level of less than 1×10⁻⁶. -5 Pa, co-deposited on the anolyte film Materials and The material is used as the hole injection layer. The proportion of HI-2 material is 3%, the evaporation rate of HT-28 material is 1 Å / s, and the total evaporation film thickness (i.e., the thickness of the hole injection layer) is 100 Å. The 3% is calculated based on the sum of the masses of HT-24 material and HI-2 material as 100%, that is, based on the total mass of the hole injection layer as 100%. All percentages mentioned below are based on the total mass of the corresponding functional layer as 100%. In addition, the total evaporation film thickness refers to the thickness of the corresponding functional layer formed by evaporation, which will not be elaborated on in detail.

[0093] (3) A hole transport layer is vacuum-deposited on the hole injection layer. The material used is HT-28, the deposition rate is 1 Å / s, and the total deposition thickness is 1200 Å. (4) An electron blocking layer is vacuum-deposited on top of the hole transport layer, using the following material: The evaporation rate was 1 Å / s, and the total evaporation film thickness was 350 Å. (5) A light-emitting layer is vacuum co-deposited on the electron blocking layer. The light-emitting layer includes a premixed host of 94% host materials A55 and D-87 (the mass ratio of A55 and D-87 is 1:1), 5% sensitizing material PGD-40, and 1% fluorescent dye M001. The light-emitting layer is deposited by a multi-source co-evaporation method. The evaporation rate of the host materials is 1 Å / s, and the total film thickness is 400 Å. (6) A hole-blocking layer is vacuum-deposited on top of the light-emitting layer, the material being... The evaporation rate was 1 Å / s, and the total evaporation film thickness was 50 Å. (7) Vacuum co-evaporation deposition on the hole blocking layer Materials and The material serves as an electron transport layer, with a mass ratio of 1:1 between the two materials. Both materials have an evaporation rate of 1 Å / s, and the total evaporation film thickness is 280 Å. (8) A 10 Å thick Yb material is vacuum-deposited on the electron transport layer as an electron injection layer; (9) Mg and Ag materials are vapor-deposited on the electron transport layer as cathodes with a mass ratio of 1:9 (i.e. Mg:Ag=1:9) and a total vapor-deposited film thickness of 130 Å. (10) Evaporation on the cathode The material was used as the light extraction layer. The CPL-3 evaporation rate was 1 Å / s, and the total evaporation film thickness was 650 Å.

[0094] Examples 2-43: The only difference from Example 1 is that the types of fluorescent dyes in the luminescent layer are different, as shown in Table 1. All other conditions are the same.

[0095] Examples 44-52: The only difference from Example 1 is that the main material in the light-emitting layer is different, but the sensitizing material is the same, as shown in Table 1. All other conditions are the same.

[0096] Examples 53-59: The only difference from Example 1 is that the main material in the light-emitting layer is the same, but the sensitizing material is different, as shown in Table 1. All other conditions are the same.

[0097] Examples 60-64: The only difference from Example 1 is that the main material and the sensitizing material in the light-emitting layer are different, as shown in Table 1. All other conditions are the same.

[0098] Examples 65-74: The only difference from Example 1 is the different combinations of the host material, sensitizing material and fluorescent dye in the luminescent layer, as shown in Table 1.

[0099] Examples 75-84: The only difference from Example 1 is that the main material in the light-emitting layer is different. Specifically, the main material includes only the first main material or the second main material, as shown in Table 1. All other conditions are the same.

[0100] Comparative Example 1: The only difference from Example 1 is that the light-emitting layer does not contain fluorescent dye, as shown in Table 1. All other conditions are the same.

[0101] Comparative Example 2: The only difference from Example 1 is that the light-emitting layer does not contain sensitizing materials, as shown in Table 1. All other conditions are the same.

[0102] The selection and composition of the main materials, the selection and content of the phosphorescent materials, and the selection and content of the boron-containing fluorescent dyes in the light-emitting devices of Examples 1-84 and Comparative Examples 1-2 are detailed in Table 1 below. The performance of the light-emitting devices of Examples 1-84 and Comparative Examples 1-2 is also shown in Table 1 below. Table 1 This indicates the mass ratio of the two main materials and the percentage of their mass content in the light-emitting layer. For example, “A55: D-87=1:1, 94%” means that in the first light-emitting layer (or the second light-emitting layer), the mass ratio of A55 to D-87 is 1:1, and the sum of the masses of A55 and D-87 is 94% of the total mass of the light-emitting layer.

[0103] Comparative Examples 3-11: The only difference from Example 1 is that the luminescent layer does not contain fluorescent dye, the main material or content is different, or the type of sensitizing material is the same, as shown in Table 2. All other conditions are the same.

[0104] Comparative Examples 12-71: The only difference from Example 1 is that the luminescent layer does not contain sensitized dyes, the main materials or their contents are different, or the types of fluorescent dyes are the same, as shown in Table 2. All other conditions are the same.

[0105] The horizontal dipole ratios of the light-emitting devices in Examples 1-84 and Comparative Examples 1-71 are shown in Table 2 below: Table 2 This indicates the mass ratio of the two main materials and the percentage of their mass content in the light-emitting layer. For example, “A55: D-87=1:1, 94%” means that in the first light-emitting layer (or the second light-emitting layer), the mass ratio of A55 to D-87 is 1:1, and the sum of the masses of A55 and D-87 is 94% of the total mass of the light-emitting layer.

[0106] The structural formula of FGD-1 is: The structural formula of FGD-2 is .

[0107] Comparing the data from Examples 1-43, it was found that the light-emitting devices of Examples 1-43 all had higher horizontal dipole ratios, lifetimes, and current efficiencies. Among them, the light-emitting devices of Examples 18, 23, 25, 26, 38, 39, and 40 had even higher horizontal dipole ratios, lifetimes, and current efficiencies.

[0108] Comparing the data from Examples 65-74, it was found that the light-emitting devices of Examples 65-74 had higher horizontal dipole ratios, lifetimes, and current efficiencies. Among them, the light-emitting devices of Examples 65, 66, 68 to 73 had even higher horizontal dipole ratios, lifetimes, and current efficiencies.

[0109] Comparing Examples 75-84 with Example 1, it was found that when the light-emitting layer contains only the first main material or the second main material, the effect of the light-emitting device is not as good as the effect when the light-emitting layer contains both the first main material and the second main material.

[0110] Comparing Comparative Example 1 with Example 1, it was found that the effect of Comparative Example 1 was not as good as that of Example 1. This is because the light-emitting layer does not contain fluorescent dye, resulting in poor performance of the light-emitting device.

[0111] Comparing Comparative Example 2 with Example 1, it was found that the effect of Comparative Example 2 was not as good as that of Example 1. This is because the light-emitting layer does not contain sensitizing materials, resulting in poor performance of the light-emitting device.

[0112] Example 85 The light-emitting device in this embodiment is a top-emitting stacked device, and its fabrication method is as follows: (1) The top-emitting substrate coated with ITO conductive layer (anode) was ultrasonically treated in commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in acetone: ethanol mixed solvent, baked in a clean environment until all moisture was removed, cleaned with ultraviolet light and ozone, and bombarded with low-energy cation beam. (2) Place the top-emitting substrate with the ITO conductive layer into a vacuum chamber and evacuate it to a vacuum level of less than 1×10⁻⁶. -5 Pa, HT-28 and HI-2 materials are co-deposited on the anolyte film as the first hole injection layer, with HI-2 material accounting for 3%, HT-28 material evaporation rate of 1 Å / s, and total film thickness (i.e., the thickness of the first hole injection layer) of 100 Å; where 3% is calculated as the sum of the masses of HT-24 and HI-2 materials of 100%, that is, as the total mass of the second hole injection layer of 100%. All percentages mentioned below are calculated as the total mass of the corresponding functional layer of 100%. In addition, the total film thickness refers to the thickness of the corresponding functional layer formed by evaporation, which will not be elaborated in detail. (3) A first hole transport layer was vacuum-deposited on the first hole injection layer. The material used was HT-28, the deposition rate was 1 Å / s, and the total deposition thickness was 250 Å. (4) A first electron blocking layer was vacuum-deposited on the first hole transport layer. The material used was HT-29, the deposition rate was 1 Å / s, and the total film thickness was 150 Å. (5) A first light-emitting layer is vacuum co-deposited on the first electron blocking layer. The first light-emitting layer includes a premixed host of 94% host materials A55 and D-87 (mass ratio of A55 and D-87 1:1), 5% phosphorus photosensitizer PGD-40, and 1% boron-containing fluorescent dye M001. The deposition is carried out by multi-source co-deposition. The deposition rate of the host materials is 1 Å / s, and the total deposition film thickness is 400 Å. (6) A first hole blocking layer is vacuum-deposited on the first light-emitting layer. The material is PH-31, the deposition rate is 1 Å / s, and the total deposition thickness is 50 Å. (7) ET-52 and ET-57 materials were vacuum co-deposited on the first hole blocking layer as the first electron transport layer. The mass ratio of the two materials was 1:1, the deposition rate of both materials was 1 Å / s, and the total deposition thickness was 200 Å. (8) CGL-3 material and metal Yb were co-deposited on the first electron transport layer as an n-type charge generation layer. The CGL-3 deposition rate was 1 Å / s, the proportion of metal Yb was 3%, and the total thickness was 100 Å. (9) HI-2 and HT-28 materials were deposited on the n-type charge generation layer as the p-type charge generation layer. The HT-28 deposition rate was 1 Å / s, the proportion of HI-2 was 7%, and the total thickness was 100 Å. (10) A second hole transport layer was vacuum-deposited on the p-type charge generation layer. The material used was HT-28, the deposition rate was 1 Å / s, and the total deposition thickness was 250 Å. (11) A second electron blocking layer was vacuum-deposited on the second hole transport layer. The material used was HT-29, the deposition rate was 1 Å / s, and the total deposition thickness was 150 Å. (12) A second light-emitting layer is vacuum co-deposited on the second electron blocking layer. The second light-emitting layer includes a premixed host of 94% host materials A55 and D-87 (the mass ratio of A55 and D-87 is 1:1), 5% phosphorus photosensitizer PGD-40, and 1% boron-containing fluorescent dye M001. The deposition is carried out by a multi-source co-deposition method. The deposition rate of the host materials is 1 Å / s, and the total deposition film thickness is 400 Å. (13) A second hole blocking layer is vacuum-deposited on the second light-emitting layer. The material is PH-31, the deposition rate is 1 Å / s, and the total deposition thickness is 50 Å. (14) ET-52 and ET-57 materials were vacuum co-deposited on the second hole blocking layer as the second electron transport layer. The mass ratio of the two materials was 1:1, the deposition rate of both materials was 1 Å / s, and the total deposition thickness was 280 Å. (15) A Yb material with a thickness of 10 Å was vacuum-deposited on the second electron transport layer as the first electron injection layer; (16) Mg and Ag materials are vapor-deposited on the first electron injection layer as cathodes with a mass ratio of 1:9 (i.e. Mg:Ag=1:9) and a total vapor-deposited film thickness of 130 Å. (17) CPL-3 material was deposited on the cathode as a light extraction layer. The CPL-3 deposition rate was 1 Å / s and the total deposition thickness was 650 Å.

[0113] Examples 86-105: The only difference from Example 85 is that the types of fluorescent dyes in the first and second light-emitting layers are different, as shown in Table 3. All other conditions are the same.

[0114] Examples 106-114: The only difference from Example 85 is that the types of main materials in the first and second light-emitting layers are different, while the types of sensitizing materials are the same, as shown in Table 3. All other conditions are the same.

[0115] Examples 115-119: The only difference from Example 85 is that the main material in the first light-emitting layer and the second light-emitting layer is the same, but the sensitizing material is different, as shown in Table 3. All other conditions are the same.

[0116] Examples 120-124: The only difference from Example 85 is that the types of main materials and sensitizing materials in the first and second light-emitting layers are different, as detailed in Table 3. All other conditions are the same.

[0117] Examples 125-138: The only difference from Example 85 is the different combinations of the main material, sensitizing material and fluorescent dye in the first and second light-emitting layers, as shown in Table 3.

[0118] Comparative Examples 72-73: The fabrication method of the light-emitting device is basically the same as that of Example 1, except that the composition of the first light-emitting layer and the second light-emitting layer is detailed in Table 3 below.

[0119] The efficiency ratios and lifetimes of the light-emitting devices in Examples 85-138 and Comparative Examples 72-73 are shown in the table below.

[0120] Table 3 This indicates that the mass ratio of the two main materials is 1:1, and the sum of the mass contents of the two main materials in the light-emitting layer is 94%. Taking "A55:D-87=1:1,94%" as an example, it means that in the first light-emitting layer (or the second light-emitting layer), the mass ratio of A55 to D-87 is 1:1, and the sum of the masses of A55 and D-87 is 94% of the total mass of the first light-emitting layer.

[0121] Comparing the data from Examples 85-105, it was found that the light-emitting devices of Examples 85-105 had higher lifespan and current efficiency. Among them, the light-emitting devices of Examples 88, 90, 91, 103, and 105 had even higher lifespan and current efficiency.

[0122] Comparing the data from Examples 125-138, it was found that the light-emitting devices of Examples 125-138 had higher lifespan and current efficiency, with the light-emitting devices of Examples 125, 126, 132, and 133 having even higher lifespan and current efficiency.

[0123] Comparing Comparative Example 72 with Example 85, it was found that the effect of Comparative Example 72 was not as good as that of Example 85. This is because the first light-emitting layer and the second light-emitting layer do not contain fluorescent dyes, resulting in poor performance of the light-emitting device.

[0124] Comparing Comparative Example 73 with Example 85, it was found that the effect of Comparative Example 73 was not as good as that of Example 85. This is because the first light-emitting layer and the second light-emitting layer do not contain fluorescent dyes, resulting in poor performance of the light-emitting device.

[0125] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0126] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A light-emitting device, characterized in that, include: A light-emitting structure, the light-emitting structure comprising at least one light-emitting unit; The light-emitting unit includes at least one light-emitting layer; the at least one light-emitting layer includes a host material, a sensitizing material, and a fluorescent dye, wherein the horizontal dipole ratio of the fluorescent dye is greater than or equal to 50%.

2. The light-emitting device according to claim 1, characterized in that, The proportion of horizontal dipoles in the fluorescent dye is greater than or equal to 70%; Preferably, the proportion of horizontal dipoles in the fluorescent dye is greater than or equal to 75%; Preferably, the proportion of horizontal dipoles in the fluorescent dye is greater than or equal to 80%; Preferably, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 50%; Preferably, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 70%; Preferably, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 75%; Preferably, the proportion of horizontal dipoles in the light-emitting layer is greater than or equal to 80%.

3. The light-emitting device according to claim 1, characterized in that, The full width at half maximum (FWHM) of the fluorescent dye is less than 40 nm; Preferably, the full width at half maximum (FWHM) of the fluorescent dye is less than 30 nm.

4. The light-emitting device according to claim 1, characterized in that, The singlet energy level of the host material is higher than the triplet energy level of the sensitizing material; the triplet energy level of the host material is higher than the triplet energy level of the sensitizing material; Preferably, the sensitizing material includes a phosphorescent material; Preferably, the triplet energy level of the phosphorescent material is higher than the singlet energy level of the fluorescent dye, and / or, the triplet energy level of the phosphorescent material is higher than the triplet energy level of the fluorescent dye.

5. The light-emitting device according to claim 4, characterized in that, The host material includes a first host material and a second host material, the first host material and the second host material form an excitocomplex, the singlet energy level of the excitocomplex is higher than the triplet energy level of the phosphorescent material, and the triplet energy level of the excitocomplex is higher than the triplet energy level of the phosphorescent material. Preferably, the singlet energy level of the exciton complex is higher than the triplet energy level of the fluorescent dye, and the triplet energy level of the exciton complex is higher than the triplet energy level of the fluorescent dye.

6. The light-emitting device according to claim 5, characterized in that, The first host material is a hole-transporting host, the second host material is an electron-transporting host, and the singlet energy level S1 of the first host material is... P The singlet energy level S1 of the second host material N The singlet energy level S1 of the excitocomplex EX Satisfy the following relationship: S1 P >S1 N ≥S1 EX ; and / or, the singlet state energy level S1 of the excitocomplex EX The triplet energy level T1 of the excitocomplex EX The following relationship must be satisfied: 0 < S1 EX -T1 EX ≤0.3eV; Preferably, the highest occupied track E of the hole transport type body HOMO P and the lowest empty orbit E LUMO P The highest occupied track E of the electron transmission body HOMO N and the lowest empty orbit E LUMO N Satisfy: E HOMO P >E HOMO N E LUMO P >E LUMO N ; Preferably, E HOMO P -E HOMO N >0.1eV, and / or, E LUMO P -E LUMO N >0.3eV.

7. The light-emitting device according to claim 1, characterized in that, The proportion of horizontal dipoles in the fluorescent dye is greater than or equal to the proportion of horizontal dipoles in the sensitizing material; Preferably, the horizontal dipole ratio of the sensitizing material is greater than or equal to 50%; Preferably, the sensitizing material has a horizontal dipole ratio greater than or equal to 70%.

8. The light-emitting device according to claim 1 or 2, characterized in that, The fluorescent dye comprises a structural formula as shown in Formula I: Among them, ring A1, ring A2, and ring A3 are each independently selected from any one of substituted or unsubstituted C6~C60 aromatic rings and substituted or unsubstituted C3~C60 heteroaromatic rings; X and X2 are each independently selected from N or CRG; X1 is selected from any one of the following: non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; L1 is independently selected from any one of single bond, O, S, Se, NAr1, CR8R9; when L1 is selected from single bond and m is 1, ring A1 and ring A3 are directly connected through single bond; m is selected from 0 or 1; when m is 0, L1 does not exist; Ar and Ar1 are selected from any one of unsubstituted or R'-substituted C6~C60 aryl groups and unsubstituted or R'-substituted C3~C60 heteroaryl groups; Ar is not connected to the adjacent ring structure or is connected to the adjacent ring structure through a chemical bond to form a ring; Ar1 ​​is not connected to the adjacent ring structure or is connected to the adjacent ring structure through a chemical bond to form a ring. R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from hydrogen, halogen, cyano, nitro, hydroxyl, amino, substituted or unsubstituted C1-C20 straight-chain or branched alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, and substituted or unsubstituted C6-C30. Any one of the following: arylsilyl, substituted or unsubstituted C3-C30 heteroarylsilyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C60 arylamino, substituted or unsubstituted C3-C60 heteroarylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryloxy, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; RG is independently selected from hydrogen atom, deuterium atom, fluorine atom, substituted or unsubstituted C1~C50 silyl group, substituted or unsubstituted C1~C50 alkyl group, substituted or unsubstituted C1~C50 alkoxy group, substituted or unsubstituted C1~C20 fluoroalkyl group, substituted or unsubstituted C1~C20 fluoroalkoxy group, substituted or unsubstituted cycloalkyl group with 3~50 cyclic carbon atoms, and substituted or unsubstituted aryl group with 6~50 cyclic carbon atoms. R1 is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; R2 and R3 are not connected to each other or are connected to form a ring through a chemical bond; R4 and R5 are not connected to each other or are connected to form a ring through a chemical bond; R6 and R7 are not connected to each other or are connected to form a ring through a chemical bond; R8 and R9 are not connected to each other or are connected to form a ring through a chemical bond. The substituents described in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently selected from deuterium, halogens, unsubstituted or R'-substituted C1-C20 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C20 cycloalkyl groups, unsubstituted or R'-substituted C1-C20 alkoxy groups, unsubstituted or R'-substituted C2-C20 alkenyl groups, unsubstituted or R'-substituted C1-C20 alkylsilyl groups, unsubstituted or R'-substituted C1-C20 alkylamino groups, and unsubstituted or R'-substituted... At least one of the following: substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C3-C30 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C3-C30 heteroarylamino, unsubstituted or R'-substituted C6-C30 aryloxy, unsubstituted or R'-substituted C3-C30 heteroaryloxy, unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl, and unsubstituted or R'-substituted C6-C30 arylthio. The substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently not connected to adjacent ring structures or connected to form a ring by chemical bonds, and at least two adjacent groups in the substituents are not connected to each other or are connected to form a ring by chemical bonds. Each R' is independently selected from at least one of deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylsilyl, C3-C30 heteroarylsilyl, C6-C60 aryl, and C3-C60 heteroaryl; at least two adjacent R's are not connected or are linked by chemical bonds to form a ring; R's are not connected to adjacent ring structures or are linked by chemical bonds to form a ring.

9. The light-emitting device according to claim 8, characterized in that, The fluorescent dye comprises at least one of the structural formulas shown in Formula II-1 and Formula II-2: Wherein, X has the same range of definition as X in Equation I; X1 has the same range of definition as X1 in Equation I; X2 has the same range of definition as X2 in Equation I; X3 is selected from any one of the following: non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; R1 has the same limiting range as R1 in Equation I; R2 has the same limiting range as R2 in Equation I; R3 has the same limiting range as R3 in Equation I; R4 has the same limiting range as R4 in Equation I; R5 has the same limiting range as R5 in Equation I; R6 has the same limiting range as R6 in Equation I; R7 has the same limiting range as R7 in Equation I. Z1, Z2, Z3, Z4, Z5 and Z6 are each independently selected from CRB or N; Y1, Y2, Y3, Y4, Y5 and Y6 are each independently selected from CRA or N; RB and RA are each independently selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C20 straight-chain or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted The C3-C30 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C3-C30 heteroarylamino, unsubstituted or R'-substituted C6-C30 aryloxy, unsubstituted or R'-substituted C3-C30 heteroaryloxy, unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl, and unsubstituted or R'-substituted C6-C30 arylthio. RB and RA are independently not connected to adjacent ring structures or are connected to each other through chemical bonds to form a ring. Any two adjacent RBs are not connected to each other or are connected to each other through chemical bonds to form a ring. Any two adjacent RAs are not connected to each other or are connected to each other through chemical bonds to form a ring. R' has the same defined range as R' in Equation I; Preferably, the RA is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C10 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C10 cycloalkyl groups, unsubstituted or R'-substituted C1-C10 alkoxy groups, unsubstituted or R'-substituted C2-C10 alkenyl groups, unsubstituted or R'-substituted C1-C10 alkylsilyl groups, unsubstituted or R'-substituted C1-C10 alkylamino groups, unsubstituted or R'-substituted C6-C20 arylsilyl groups, and unsubstituted or R'-substituted... Any one of the following: C3~C20 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6~C20 arylamino, unsubstituted or R'-substituted C3~C20 heteroarylamino, unsubstituted or R'-substituted C6~C20 aryloxy, unsubstituted or R'-substituted C3~C20 heteroaryloxy, unsubstituted or R'-substituted C6~C30 aryl, unsubstituted or R'-substituted C3~C30 heteroaryl, and unsubstituted or R'-substituted C6~C20 arylthio. Preferably, the RA is selected from any one of hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C5 straight-chain or branched alkyl, unsubstituted or R'-substituted C2-C5 alkenyl, unsubstituted or R'-substituted C1-C5 alkylsilyl, cyano, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; Preferably, the RB is selected from hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C10 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C10 cycloalkyl groups, unsubstituted or R'-substituted C1-C10 alkoxy groups, unsubstituted or R'-substituted C2-C10 alkenyl groups, unsubstituted or R'-substituted C1-C10 alkylsilyl groups, unsubstituted or R'-substituted C1-C10 alkylamino groups, unsubstituted or R'-substituted C6-C20 arylsilyl groups, and unsubstituted or R'-substituted... Any one of the following: C3~C20 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6~C20 arylamino, unsubstituted or R'-substituted C3~C20 heteroarylamino, unsubstituted or R'-substituted C6~C20 aryloxy, unsubstituted or R'-substituted C3~C20 heteroaryloxy, unsubstituted or R'-substituted C6~C30 aryl, unsubstituted or R'-substituted C3~C30 heteroaryl, and unsubstituted or R'-substituted C6~C20 arylthio. Preferably, the RB is selected from any one of hydrogen, deuterium, halogen, unsubstituted or R'-substituted C1-C5 straight-chain or branched alkyl, unsubstituted or R'-substituted C2-C5 alkenyl, unsubstituted or R'-substituted C1-C5 alkylsilyl, cyano, unsubstituted or R'-substituted C6-C15 arylamino, unsubstituted or R'-substituted C3-C15 heteroarylamino, unsubstituted or R'-substituted C6-C15 aryloxy, unsubstituted or R'-substituted C3-C15 heteroaryloxy, unsubstituted or R'-substituted C6-C20 aryl, unsubstituted or R'-substituted C3-C20 heteroaryl, and unsubstituted or R'-substituted C6-C15 arylthio.

10. The light-emitting device according to claim 9, characterized in that, The fluorescent dye has at least one of the structural formulas shown in formulas M001 to M252: 。 11. The light-emitting device according to claim 1, characterized in that, The sensitizing material includes a metal complex, and the general formula of the metal complex includes: M(La)p(Lb)n(Lc)q; Among them, La is the first ligand that coordinates with metal M, Lb is the second ligand that coordinates with metal M, and Lc is the third ligand that coordinates with metal M. La, Lb, and Lc can be the same or different, and La, Lb, and Lc can be arbitrarily linked to form a polydentate ligand. The metal M is selected from metals with a relative atomic mass greater than or equal to 40; p is selected from 1, 2, or 3; n is selected from 0, 1, or 2; q is selected from 0, 1, or 2; p + n + q equals the oxidation state of metal M; when p is greater than or equal to 2, multiple La are the same or different; when n is equal to 2, two Lb are the same or different; when q is equal to 2, two Lc are the same or different. Lb is selected from at least one of O, S, Se, NRN1 and CRC1RC2; Lc and Ld are each independently selected from at least one of O, S, Se and NRN2; RN1, RN2, RC1, and RC2 are each independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having 3-20 ring atoms, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or At least one of the following: unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl; Preferably, the metal M includes at least one of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir, and Pt; Preferably, the metal M is selected from Pt or Ir; Preferably, any adjacent substituents among RN1, RN2, RC1, and RC2 can be linked to form a ring.

12. The light-emitting device according to claim 11, characterized in that, The metal complex has the structural formula shown in formula Ma: Formula Ma in, Ring A4 is selected from heteroaromatic rings having 5 to 30 ring atoms; Ring A5 is selected from aromatic rings having 6 to 30 ring atoms, heteroaromatic rings having 5 to 30 ring atoms, or combinations thereof; U1 to U8 are each independently selected from CRu or N; R 10 and R 11 Each can be used independently to indicate monosubstituted, polysubstituted, or unsubstituted. R 10 R 11 Each of the elements, Ru, is independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having ~20 ring atoms, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2~ At least one of the following: C20 alkynyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl; When ring A4 is selected from a pyridine ring and ring A5 is selected from a benzene ring, and R 10 and R 11 At least one of the following is selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having 3-20 ring atoms, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C2-C When at least one of the following groups is selected: 20-alkynyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl; Adjacent substituent R 10 R 11 Ru can be optionally connected to form a ring.

13. The light-emitting device as described in claim 12, characterized in that, The sensitizing material comprises at least one of the structural formulas shown in formulas PGD-1 to PGD-71: ; where D represents deuterium.

14. The light-emitting device according to claim 5, characterized in that, The first main material includes a structure as shown in Formula VI: Wherein, the Ar 1 It is selected from one of substituted or unsubstituted C6-C60 aryl groups and substituted or unsubstituted C3-C60 heteroaryl groups; R 001 and R 002 R represents the number of substituents on the benzene ring that are zero-substituted to the maximum permissible number of substituents. 001 and R 002 Each is independently selected from one of the following: deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aryl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl. Preferably, the first body material comprises at least one of the structural formulas shown in Formulas IV-1 to IV-3: Where a is an integer between 1 and 4; b is an integer between 1 and 4; and c is 1 or 2. Ar 2 Ar 3 Ar 4 Ar 5 Ar 6 Each is independently selected from one of substituted or unsubstituted C6-C60 aryl groups or substituted or unsubstituted C3-C60 heteroaryl groups; R 003 ~R 013 The substituents on the benzene ring are selected independently from one of the following: hydrogen, deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aryl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl. Preferably, the Ar 2 Ar 3 Ar 4 Ar 5 Ar 6 Each of the following is independently selected from at least one of substituted or unsubstituted benzene, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted triphenylene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted indole, substituted or unsubstituted indolocarbazole, substituted or unsubstituted carbazole, and substituted or unsubstituted fluorene; Preferably, the first host material comprises at least one of the compounds shown in Formula D-1 to Formula D-111: 。 15. The light-emitting device according to claim 5, characterized in that, The second host material includes nitrogen-containing aromatic heterocyclic compounds. Preferably, the second body material comprises a structure as shown in Formula V: Formula V Among them, Q1 to Q5 are each independently selected from nitrogen or CR. 014 R 014 Independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C60 arylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl; adjacent R 014 Connect or not connect; Preferably, the second body material comprises at least one of the structural formulas shown in Formula A1 to Formula A127: 。 16. The light-emitting device according to claim 1, characterized in that, The mass of the sensitizing material accounts for 0.1-50% of the total mass of the corresponding luminescent layer, and the mass of the fluorescent dye accounts for 0.1-30% of the total mass of the corresponding luminescent layer. Preferably, the mass of the sensitizing material accounts for 0.1-30% of the total mass of the corresponding luminescent layer. Preferably, the mass of the sensitizing material accounts for 0.1-20% of the total mass of the corresponding luminescent layer; Preferably, the mass of the fluorescent dye accounts for 0.1-10% of the total mass of the corresponding luminescent layer; Preferably, the mass of the fluorescent dye accounts for 0.1-5% of the total mass of the corresponding luminescent layer.

17. The light-emitting device according to claim 1, characterized in that, The number of light-emitting units is multiple, and the light-emitting structure further includes a charge-generating layer located between adjacent light-emitting units; Preferably, in each of the light-emitting units, the light-emitting layer comprises multiple sub-light-emitting layers, and the material of at least one of the sub-light-emitting layers comprises the fluorescent dye.

18. A light-emitting device, characterized in that, include: A light-emitting structure, the light-emitting structure comprising at least one light-emitting unit; The light-emitting unit includes at least one light-emitting layer; the at least one light-emitting layer includes a host material, a sensitizing material, and a fluorescent dye, wherein the fluorescent dye has a structural formula as shown in Formula I: Among them, ring A1, ring A2, and ring A3 are each independently selected from any one of substituted or unsubstituted C6~C60 aromatic rings and substituted or unsubstituted C3~C60 heteroaromatic rings; X and X2 are each independently selected from N or CRG; X1 is selected from any one of the following: non-existent, single bond, O, S, Se, NR1, CR2R3, SiR4R5, GeR6R7; L1 is independently selected from any one of single bond, O, S, Se, NAr1, CR8R9; when L1 is selected from single bond and m is 1, ring A1 and ring A3 are directly connected through single bond; m is selected from 0 or 1; when m is 0, L1 does not exist; Ar and Ar1 are selected from any one of unsubstituted or R'-substituted C6~C60 aryl groups and unsubstituted or R'-substituted C3~C60 heteroaryl groups; Ar is not connected to the adjacent ring structure or is connected to the adjacent ring structure through a chemical bond to form a ring; Ar1 ​​is not connected to the adjacent ring structure or is connected to the adjacent ring structure through a chemical bond to form a ring. R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from hydrogen, halogen, cyano, nitro, hydroxyl, amino, substituted or unsubstituted C1-C20 straight-chain or branched alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, and substituted or unsubstituted C6-C30. Any one of the following: arylsilyl, substituted or unsubstituted C3-C30 heteroarylsilyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C60 arylamino, substituted or unsubstituted C3-C60 heteroarylamino, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryloxy, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; RG is independently selected from hydrogen atom, deuterium atom, fluorine atom, substituted or unsubstituted C1-C50 silyl group, substituted or unsubstituted C1-C50 alkyl group, substituted or unsubstituted C1-C50 alkoxy group, substituted or unsubstituted C1-C20 fluoroalkyl group, substituted or unsubstituted C1-C20 fluoroalkoxy group, substituted or unsubstituted cycloalkyl group with 3-50 cyclic carbon atoms, and substituted or unsubstituted aryl group with 6-50 cyclic carbon atoms. R1 is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; R2 and R3 are not connected to each other or are connected to form a ring through a chemical bond; R4 and R5 are not connected to each other or are connected to form a ring through a chemical bond; R6 and R7 are not connected to each other or are connected to form a ring through a chemical bond; R8 and R9 are not connected to each other or are connected to form a ring through a chemical bond. The substituents described in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently selected from deuterium, halogens, unsubstituted or R'-substituted C1-C20 straight-chain or branched alkyl groups, unsubstituted or R'-substituted C3-C20 cycloalkyl groups, unsubstituted or R'-substituted C1-C20 alkoxy groups, unsubstituted or R'-substituted C2-C20 alkenyl groups, unsubstituted or R'-substituted C1-C20 alkylsilyl groups, unsubstituted or R'-substituted C1-C20 alkylamino groups, and unsubstituted or R'-substituted... At least one of the following: substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C3-C30 heteroarylsilyl, cyano, nitro, hydroxyl, amino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C3-C30 heteroarylamino, unsubstituted or R'-substituted C6-C30 aryloxy, unsubstituted or R'-substituted C3-C30 heteroaryloxy, unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl, and unsubstituted or R'-substituted C6-C30 arylthio. The substituents in rings A1, A2, A3, R1, R2, R3, R4, R5, R6, R7, R8, R9, and RG are each independently not connected to adjacent ring structures or connected to form a ring by chemical bonds, and at least two adjacent groups in the substituents are not connected to each other or are connected to form a ring by chemical bonds. Each R' is independently selected from at least one of deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylsilyl, C3-C30 heteroarylsilyl, C6-C60 aryl, and C3-C60 heteroaryl; at least two adjacent R's are not connected or are linked by chemical bonds to form a ring; R's are not connected to adjacent ring structures or are linked by chemical bonds to form a ring.

19. The light-emitting device according to claim 18, characterized in that, The sensitizing material includes a metal complex, and the general formula of the metal complex includes: M(La)p(Lb)n(Lc)q; Among them, La is the first ligand that coordinates with metal M, Lb is the second ligand that coordinates with metal M, and Lc is the third ligand that coordinates with metal M. La, Lb, and Lc can be the same or different, and La, Lb, and Lc can be arbitrarily linked to form a polydentate ligand. The metal M is selected from metals with a relative atomic mass greater than or equal to 40; p is selected from 1, 2, or 3; n is selected from 0, 1, or 2; q is selected from 0, 1, or 2; p + n + q equals the oxidation state of metal M; when p is greater than or equal to 2, multiple La are the same or different; when n is equal to 2, two Lb are the same or different; when q is equal to 2, two Lc are the same or different. Lb is selected from at least one of O, S, Se, NRN1 and CRC1RC2; Lc and Ld are each independently selected from at least one of O, S, Se and NRN2; RN1, RN2, RC1, and RC2 are each independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted C1-C20 heteroalkyl, substituted or unsubstituted heterocyclic having 3-20 ring atoms, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C2-C20 alkenyl, substituted or At least one of the following: unsubstituted C2-C20 alkynyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C20 alkylsilyl, substituted or unsubstituted C6-C20 arylsilyl, substituted or unsubstituted C3-C20 alkylgermanium, substituted or unsubstituted C6-C20 arylgermanium, substituted or unsubstituted C0-C20 amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, and phosphinyl; Preferably, the main material includes a first main material and a second main material; The first main material includes a structure as shown in Formula VI: Formula VI Wherein, the Ar 1 It is selected from one of substituted or unsubstituted C6-C60 aryl groups and substituted or unsubstituted C3-C60 heteroaryl groups; R 001 and R 002 R represents the number of substituents on the benzene ring that are zero-substituted to the maximum permissible number of substituents. 001 and R 002 Each is independently selected from one of the following: deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aryl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl. And / or, The second host material includes nitrogen-containing aromatic heterocyclic compounds. Preferably, the second body material comprises a structure as shown in Formula V: Formula V Among them, Q1 to Q5 are each independently selected from nitrogen or CR. 014 R 014 Independently selected from deuterium, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 silyl, substituted or unsubstituted C6-C60 arylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C7-C30 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl; adjacent R 014 Connect or not connect.

20. An electronic device, characterized in that, Includes the light-emitting device according to any one of claims 1 to 19.

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