Light emitting device and display panel

Abstract

The invention provides a light emitting device and a display panel. The light-emitting device comprises a first electrode layer, a light-emitting function layer and a second electrode layer which are stacked in sequence; the light-emitting functional layer comprises at least one light-emitting layer, the material of the light-emitting layer comprises a boron-containing light-emitting dye, and the energy level difference between the singlet state and the triplet state of the boron-containing light-emitting dye is greater than or equal to 0.3 eV. In the material of the light-emitting layer, the singlet state and triplet state energy level difference (Est) of a boron-containing light-emitting dye is greater than or equal to 0.3 eV, and the T1 energy level of the boron-containing light-emitting dye is relatively low, so that TTA (triplet state-triplet state annihilation) and TPA (triplet state-polaron annihilation) processes can be avoided, the efficiency roll-off of the light-emitting device is reduced, and the service life of the light-emitting device is prolonged; in addition, the up-conversion process from the T1 energy level to the S1 energy level of the boron-containing luminescent dye can be avoided, generation of long-life excited state excitons in the dye is avoided, and the service life of a device is prolonged.

Description

Technical Field

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

[0002] Display panels, such as organic light-emitting diodes (OLEDs), are now widely used in terminal applications. 3 MLCT absorption, and long transient phosphorescence life, etc.), there are certain shortcomings in the performance improvement of phosphorescent electroluminescent devices. In order to improve the performance of devices, pTSF (phosphor-assisted TADF-sensitized fluorescence) technology has attracted attention. This technology transfers the energy of excitons to narrow-spectrum fluorescent materials to make the fluorescent materials emit light. It comprehensively utilizes the high utilization rate of excitons by phosphorescent materials and the characteristics of narrow fluorescence spectrum, improving the efficiency of devices while still ensuring the characteristics of narrow emission spectrum. However, due to the current pTSF technology, the performance of light-emitting devices in display panels still needs to be improved. Summary of the invention

[0003] In view of this, embodiments of the present application provide a light emitting device and a display panel.

[0004] In a first aspect, the present application provides a light emitting device, comprising:

[0005] A first electrode layer, a light-emitting functional layer, and a second electrode layer are sequentially stacked;

[0006] The light-emitting functional layer comprises at least one light-emitting layer, the material of the light-emitting layer comprises a light-emitting dye containing boron element, and the energy level difference between the singlet state and the triplet state of the light-emitting dye containing boron element is greater than or equal to 0.3 eV.

[0007] A second aspect of the present application provides another light emitting device, comprising:

[0008] A first electrode layer, a light-emitting functional layer, and a second electrode layer are sequentially stacked;

[0009] The light-emitting functional layer comprises at least one light-emitting layer, and the material of the light-emitting layer comprises a luminescent dye containing boron element, a host material and a sensitizing material, and the half-peak width of the luminescent dye containing boron element is less than 45nm.

[0010] A third aspect of the present application provides a display panel, comprising any one of the aforementioned light-emitting devices.

[0011] According to the light-emitting device provided in the embodiment of the present application, the singlet and triplet energy level difference (△Est) of the luminescent dye containing the boron element in the material of the light-emitting layer is greater than 0.3 eV, and the T1 energy level of the luminescent dye containing the boron element itself is relatively low, which can avoid the occurrence of TTA (triplet-triplet annihilation) and TPA (triplet-polaron annihilation) processes, reduce the efficiency roll-off of the light-emitting device, and improve the life of the light-emitting device; in addition, the up-conversion process from the T1 energy level to the S1 energy level of the luminescent dye containing the boron element itself can be avoided, and the generation of long-lived excited state excitons in the dye can be avoided, which is beneficial to improving the life of the device. Furthermore, after being matched with the preferred main body and sensitizer materials of the present application, better device performance is exhibited. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of a light-emitting device in one embodiment of the present application.

[0013] Figure 2 This is a schematic structural diagram of a light-emitting device in another embodiment of the present application.

[0014] Figure 3 This is a schematic structural diagram of a light-emitting device in another embodiment of the present application.

[0015] Figure 4 This is a schematic diagram of system energy transfer of a light-emitting device in one embodiment of the present application.

[0016] Figure 5 1 is a brightness-current efficiency relationship diagram of the light-emitting devices in Example 1 and Comparative Example 1.

[0017] Figure 6 1 is a time-brightness relationship diagram of the light-emitting device in Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0022] In the process of realizing the present invention, the inventors found the following problems in the related art: the narrow spectrum dyes used in the current pTSF technology are a type of TADF material with narrow spectrum emission characteristics, and their △Est is often small (△Est < 0.3eV). When the emission wavelength is fixed (S1 energy level confirmation), the dye itself has a high T1 energy level, which will lead to the TTA (triplet-triplet annihilation) and TPA (triplet-polaron annihilation) processes in the device's light-emitting layer, thereby exacerbating the efficiency roll-off of the light-emitting device, reducing efficiency, and reducing life. In addition, the dye itself is prone to the up-conversion process from T1 to S1, which makes the exciton life of the light-emitting layer longer. These will affect the device performance and are not conducive to improving the device performance.

[0023] In view of this, the first aspect of the present application provides a light emitting device, referring to Figure 1 The structural schematic diagram of the light-emitting device shown in the figure, the light-emitting device includes: a first electrode layer 100, a light-emitting functional layer 200 and a second electrode layer 300 which are stacked in sequence; the light-emitting functional layer 200 includes at least one light-emitting layer 210, and the material of the light-emitting layer 210 includes a luminescent dye containing a boron element, and the energy level difference (△Est) between the singlet and triplet states of the luminescent dye containing the boron element is greater than or equal to 0.3eV, for example, it can be 0.3eV, 0.35eV, 0.4eV, 0.5eV, 0.6eV, 0.7eV, 0.8eV, etc.

[0024] According to the light-emitting device provided in the embodiment of the present application, the singlet and triplet energy level difference (ΔEst) of the luminescent dye containing the boron element in the material of the light-emitting layer is greater than or equal to 0.3 eV, and the T1 energy level of the luminescent dye containing the boron element itself is relatively low, which can avoid the occurrence of TTA (triplet-triplet annihilation) and TPA (triplet-polaron annihilation) processes (the system energy transfer diagram of the light-emitting device is shown in FIG. Figure 4 As shown), the efficiency roll-off of the light-emitting device is reduced and the life of the light-emitting device is increased; in addition, the up-conversion process from the T1 energy level to the S1 energy level of the boron-containing luminescent dye itself can be avoided, and the generation of long-lived excited state excitons in the dye can be avoided, which is beneficial to improving the device life.

[0025] The light-emitting mechanism of light-emitting devices is as follows Figure 4As shown, the luminescent dye containing boron is the core material in the sensitized fluorescence system. The relationship between its own T1 and S1 energy levels has a great influence on the device performance. The S1 energy level of the dye determines the luminescent color of the device. When the S1 energy level is fixed, the T1 energy level of the dye decreases as △Est increases. Reducing T1 can avoid the occurrence of TTA (triplet-triplet annihilation) and TPA (triplet-polaron annihilation) processes, reduce device efficiency roll-off, and improve device life. In addition, it can avoid the up-conversion process from T1 to S1 of the dye itself, avoid the generation of long-lived excited state excitons in the dye, and help improve the device life.

[0026] It should be noted that when the △Est of the boron-containing luminescent dye is less than 0.3 eV, the T1 energy level of the boron-containing luminescent dye itself is relatively high. In addition, the upconversion process from the T1 energy level to the S1 energy level is prone to occur, which will affect the performance of the light-emitting device and is not conducive to improving the performance of the light-emitting device.

[0027] In one embodiment, the energy level difference between the singlet state and the triplet state of the boron-containing luminescent dye is greater than or equal to 0.4 eV, thereby improving the life of the light-emitting device.

[0028] In one embodiment, the half-peak width of the boron-containing luminescent dye is less than 45 nm, for example, it can be 45 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, 5 nm, etc. Therefore, the half-peak width of the boron-containing luminescent dye is narrow, and the energy of the material with a wider half-peak width in the luminescent layer can be transferred to the boron-containing luminescent dye with a narrow spectrum to achieve luminescence, and the luminescent efficiency and color purity of the light-emitting device are excellently improved, and the performance of the light-emitting device can be greatly improved.

[0029] In one embodiment, the half-peak width of the luminescent dye containing the boron element is less than 35nm. As a result, the half-peak width of the luminescent dye containing the boron element is narrower, the luminous effect is better, and the luminous efficiency and color purity of the light-emitting device are better. Exemplarily, the light-emitting device of the embodiment of the present application can achieve high color purity display, which is expected to meet the Adobe color gamut display and BT2020 color gamut display.

[0030] In one embodiment, the boron-containing luminescent dye is a resonance-type luminescent dye, thereby facilitating the acquisition of a boron-containing luminescent dye with a half-peak width less than 45 nm, and facilitating the improvement of the color purity of the light-emitting device.

[0031] In one embodiment, the boron-containing luminescent dye comprises a structure as shown in formula (I):

[0032]

[0033] Among them, X 1 , X 2 , X3 , X 4 Each independently selected from CR A1 or N;

[0034] Y 1 , Y 2 , Y 3 , Y 4 Each independently selected from CR A2 or N;

[0035] Z 1 , Z 2 , Z 3 Each independently selected from CR A3 or N;

[0036] R A1 , R A2 , R A3 Each is independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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;

[0037] Any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 At least one group of them is connected by a chemical bond to form ring F, and ring F is selected from any one of a substituted or unsubstituted C6-C60 aromatic ring and a substituted or unsubstituted C3-C60 heteroaromatic ring;

[0038] R A1 , R A2 , R A3 In the above, the other groups except those forming ring F are independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds;

[0039] Ar1 and Ar2 are each independently selected from unsubstituted or R B Substituted C6-C60 aryl, unsubstituted or R B Any one of substituted C3-C60 heteroaryl groups; Ar1 ​​and Ar2 are independently not connected to adjacent ring structures or are connected to form a ring through chemical bonds;

[0040] R B any one selected from halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; R B Not connected to adjacent ring structures or connected to form a ring through chemical bonds;

[0041] R A1 , R A2 , R A3 、Ring F、R B The substituents substituted in the above-mentioned alkyl group are each independently selected from halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, , nitro, 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; the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by chemical bonds;

[0042] R A1 , R A2 , R A3 At least one of the groups is R X , and / or, R B At least one of the groups is R X ;

[0043] R X It has the structure shown in formula a:

[0044]

[0045] Among them, -** represents the attachment site of the group;

[0046] L is selected from any one of a substituted or unsubstituted C6-C60 arylene group and a substituted or unsubstituted C3-C60 heteroarylene group;

[0047] X 11 , X 12 , X 13 , X 18 , X 19 , X 20 Each independently selected from C, CR C1 or N, and one of them is C, and C is connected to L;

[0048] X 14 , X 15 , X 16 , X 17 Each independently selected from CR C1 or any one of N;

[0049] R C1 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl;

[0050] The substituents substituted in L are each independently selected from any one of halogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'-substituted C3-C60 heteroaryl;

[0051] R' is selected from any one of halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C60 aryl, C3-C60 heteroaryl, or a combination of at least two thereof; adjacent R's are not connected or are connected to form a ring by chemical bonds; R' is not connected to adjacent ring structures or is connected to form a ring by chemical bonds.

[0052] The structure of the above-mentioned boron-containing luminescent dye contains groups that narrow the half-width, lower the T1 energy level, increase steric hindrance, inhibit molecular aggregation, lower the sublimation temperature and improve device efficiency, and separates the narrowed emission spectrum fragments and the low triplet state fragments. The half-width is narrow and △Est≥0.3eV, which can effectively inhibit the RISC (reverse intersystem crossing process) of the boron-containing luminescent dye itself. Applying the above-mentioned boron-containing luminescent dye to light-emitting devices can greatly improve the life of the light-emitting devices.

[0053] In one embodiment, the boron-containing luminescent dye comprises a structure as shown in formula (IA):

[0054]

[0055] Among them, X 1 , X 2 , X 3 , X 4 , Y 1 , Y 2 , Y 3 , Y 4 , Z 1 , Z 2 , Z 3 , Ar2 has the same defined range as in formula (I); X 5 , X 6 , X 7 , X 8 , X 9 Each independently selected from CR A4 or N; R A4any one selected from hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; two adjacent R A4 They are not connected or connected to form a ring through chemical bonds; R A4 It is not connected to the adjacent ring structure or is connected to form a ring through chemical bonds.

[0056] The molecular T1 energy level of the above-mentioned boron-containing luminescent dye is lower, which helps to increase the energy level gap between S1 and T1 and improve the device life; the molecular steric hindrance is large, which reduces the efficiency drop caused by molecular aggregation and improves the device efficiency; the molecular rigidity is strong, which reduces the molecular deformation in the ground state and excited state and narrows the molecular emission half-peak width; the molecular stacking morphology is further improved, reducing the sublimation temperature.

[0057] In a preferred embodiment, the boron-containing luminescent dye comprises a structure as shown in formula (II):

[0058]

[0059] In one embodiment, in formula (II), any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 Any two adjacent R A4 At least one group of them is connected by chemical bonds to form ring F, and ring F has a structure as shown in formula b:

[0060]

[0061] Wherein, the dotted line represents a fused bond; Q1, Q2, Q3, and Q4 are each independently selected from CR D1 or N; R D1any one selected from hydrogen, halogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, cyano, nitro, 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; R D1 It is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; M1 and M2 are each independently selected from a single bond, O, S, Se, NAr m1 , CR m1 R m2 or SiR m3 R m4 Any one of M1 and M2; at most one of them is a single bond; Ar m1 Any one selected from unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl; R m1 , R m2 , R m3 , R m4 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C6-C60 aryl, and unsubstituted or R'-substituted C3-C60 heteroaryl; R m1 With R m2 They are not connected or connected to form a ring through chemical bonds; R m3 With R m4 They are not connected to each other or are connected to form a ring through chemical bonds.

[0062] Exemplarily, M1 is selected from O, S, NAr m1 or CR m1 R m2 any one of; M2 is a single bond; illustratively, any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 Any two adjacent R A4 At most four groups in are connected by chemical bonds to form ring F; illustratively, any two adjacent R A1 Any two adjacent RA4 A group of R is connected by chemical bonds to form a ring F; and / or any two adjacent R A2 A group of them are connected by chemical bonds to form ring F.

[0063] In one embodiment, any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 Any two adjacent R A4 A group of them is connected by chemical bonds to form ring F. In one embodiment, the boron-containing luminescent dye includes a structure as shown in at least one of formula (III-1) to formula (III-14):

[0064]

[0065] Wherein, M1 is selected from O, S, NAr m1 or CR m1 R m2 Any one of: Q1, Q2, Q3, Q4, Ar m1 , R m1 , R m2 Has the same limited range as in formula b; X 1 , X 2 , X 3 , X 5 , X 6 , X 7 , X 8 , Y 1 , Y 2 , Y 3 , Y 4 , Z 1 , Z 2 , Z 3 , Ar2 has the same defined range as in Formula II.

[0066] In one embodiment, the luminescent dye containing boron element has a structure as shown in any one of Formula (III-1), Formula (III-2), Formula (III-3), Formula (III-4), Formula (III-7), Formula (III-12), Formula (III-13), and Formula (III-14). Further preferably, the luminescent dye containing boron element has a structure as shown in any one of Formula (III-1), Formula (III-2), and Formula (III-3).

[0067] In one embodiment, the boron-containing luminescent dye comprises a structure as shown in at least one of Formula (IV-1) to Formula (IV-14):

[0068]

[0069]

[0070] The dashed line represents a single bond or no connection; X 1 , X 2 , X 3 , X 5 , X 6 , X 7 , X 8 、M1、Q1、Q2、Q3、Q4、Y 1 , Y 2 , Y 3 , Z 1 , Z 2 , Z 3 , Ar2 has the same limited range as above;

[0071] Y 5 , Y 6 , Y 7 , Y 8 Each independently selected from CR A5 or N; R A5 any one selected from hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; two adjacent R A5 They are not connected or connected to form a ring through chemical bonds; R A5 It is not connected to the adjacent ring structure or is connected to form a ring through chemical bonds.

[0072] It can be understood that the boron-containing luminescent dyes may include structures of other boron-containing luminescent dyes in addition to the structures shown in formula (I), formula (II), formula (III-1) to formula (III-14), and formula (IV-1) to formula (IV-14). As long as the requirements can be met, technicians in this field can make a selection based on actual conditions.

[0073] In one embodiment, the luminescent dye containing boron element has a structure as shown in any one of formula (IV-1), formula (IV-2), formula (IV-3), formula (IV-4), formula (IV-7), formula (IV-12), formula (IV-13), and formula (IV-14); further preferably, the luminescent dye containing boron element has a structure as shown in any one of formula (IV-1), formula (IV-2), and formula (IV-3).

[0074] In one embodiment, X 5 , X 6 , X 7 , Y 2 , Y 3 , Y 5 , Y 6 , Y 7 , Y 8 , Y 9 , Z 1 , Z 2 , Z 3 At least one of them is CR X Preferably, X 6 , X 7 , Y 2 , Y 3 , Y 6 , Y 8 , Y 9 , Z 2 At least one of them is CR X .

[0075] For example, the Y 2 , Y 3 , Y 6 , Y 8 , Y 9 and Z 2 At least one of them is CR X .

[0076] In one embodiment, X 1 , X 2 , X 3 Each independently is CR A1 ; and / or, the X 5 , X 6 , X 7 , X 8 Each independently is CR A4 ; R A1 , R A4Each is independently selected from hydrogen, fluorine, cyano, substituted or unsubstituted C1-C10 straight or branched alkyl, substituted or unsubstituted C5-C10 cycloalkyl, substituted or unsubstituted C1-C10 alkoxy, substituted or unsubstituted C3-C10 alkylsilyl, substituted or unsubstituted C2-C10 alkylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6 -C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryloxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, further preferably hydrogen, cyano, substituted or unsubstituted C1-C5 straight or branched alkyl, substituted or unsubstituted C3-C10 alkylsilyl, substituted or unsubstituted C6-C20 arylamino, substituted or unsubstituted C6-C20 aryl, substituted or unsubstituted C3-C20 heteroaryl.

[0077] For example, X 1 , X 2 and X 3 are CH; and / or, X 5 , X 6 , X 7 and X 8 All are CH;

[0078] Q1, Q2, Q3, Q4 are each independently CR D1 ; Q1, Q2, Q3 and Q4 are all CH; Y 1 , Y 2 , Y 3 Each independently is CR A2 ; Y 1 , Y 2 and Y 3 The number of CHs in the address ranges from 1 to 3, specifically, it can be 1, 2 or 3.

[0079] For example, Y 1 CH, Y 2 , Y 3 Each independently is CR A2 .

[0080] In one embodiment, R A2Each is independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, and substituted or unsubstituted C6-C30 aryloxy.

[0081] For example, Y 5 , Y 6 , Y 7 , Y 8 Each independently selected from CR A5 ; Y 5 , Y 6 , Y 7 , Y 8 The number of CHs in the MAC address is 2-4, specifically, it can be 2, 3 or 4.

[0082] For example, when the dashed line in formula (IV-1) to formula (IV-9) and formula (IV-14) represents the absence of Y 6 , Y 8 One of them is CR A5 ; or, when the dotted line in formula (IV-1) to formula (IV-9) and formula (IV-14) represents a single bond, the Y 6 , Y 7 One of them is CR A5 .

[0083] For example, in any one of Formula (IV-10) to Formula (IV-13), the Y 6 , Y 8 , Y 9 One of them is CR A5 .

[0084] In one embodiment, R A5 Each is independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl.

[0085] For example, Z 1 , Z 2 , Z 3 Each independently is CR A3 ; Z 1 , Z 2 and Z3 The number of CH in Z is 2-3; 1 and Z 3 for CH, the Z 2 CR A3 .

[0086] In one embodiment, R A3 Each is independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, and substituted or unsubstituted C3-C60 heteroaryl.

[0087] In one embodiment, the boron-containing luminescent dye comprises a structure as shown in at least one of Formula (V-1) to Formula (V-7):

[0088]

[0089]

[0090] Wherein, the dotted line represents a single bond or no connection; M1 is selected from O, S, NAr m1 or CR m1 R m2 Any one of Ar m Any one selected from unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl; R m1 , R m2 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; the R m1 With R m2 They are not connected or connected to form a ring through chemical bonds; R A2 , R A3 , R A5 Each independently represents no substitution, monosubstitution to the maximum allowed substitution; R A2 , R A3 , R A5R is independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; A2 , R A3 , R A5 Each independently is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; R A2 , R A3 and R A5 At least one of the groups is R X ; R A2 Selected from hydrogen, R X , any one of substituted or unsubstituted C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C1-C10 alkylsilyl, substituted or unsubstituted C6-C20 arylamino, substituted or unsubstituted C6-C20 aryl, substituted or unsubstituted C3-C20 heteroaryl, and substituted or unsubstituted C6-C20 aryloxy.

[0091] It can be understood that the boron-containing luminescent dyes may include structures of other boron-containing luminescent dyes in addition to the structures shown in formula (V-1) to formula (V-14). As long as the requirements can be met, technicians in this field can make a selection based on actual conditions.

[0092] In one embodiment, R A3 Selected from hydrogen, R X , any one of a substituted or unsubstituted C1-C10 straight or branched alkyl group, and a substituted or unsubstituted C6-C20 aryl group.

[0093] In one embodiment, R A5 Selected from hydrogen, R X , any one of substituted or unsubstituted C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C1-C10 alkylsilyl, substituted or unsubstituted C6-C20 arylamino, substituted or unsubstituted C6-C20 aryl, and substituted or unsubstituted C3-C20 heteroaryl.

[0094] In one embodiment, R X It has the structure shown in formula c:

[0095]

[0096] Wherein, -* represents the attachment site of the group; R C1 Indicates no substitution, single substitution to the maximum allowed substitution; L, R C1 Has the same definition as in formula a.

[0097] For example, R C1 Indicates monosubstitution to the maximum allowed substitution.

[0098] For example, R C1 The number of substitutions is 1-9, specifically, it can be 1, 2, 3, 4, 5, 6, 7, 8 or 9, more preferably 1-3, specifically, it can be 1, 2 or 3;

[0099] For example, R C1 The attachment site is at least one of position 2, position 3, position 6, position 7, position 9 and position 10 in formula c, preferably position 9 or position 10;

[0100] In one embodiment, R X Having a structure as shown in formula d, or, R X It has the structure shown in formula e:

[0101]

[0102] Among them, R 11 Any one selected from hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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;

[0103] R 12 , R 13 Each independently represents no substitution, monosubstitution to the maximum allowed substitution; R 12 , R 13R is independently selected from any one of hydrogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C6-C30 aryloxy, unsubstituted or R'-substituted C6-C60 aryl, and unsubstituted or R'-substituted C3-C60 heteroaryl; 14 Any one selected from hydrogen, halogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'-substituted C3-C60 heteroaryl.

[0104] In one embodiment, R X The structure is or, R X The structure is

[0105] In one embodiment, R 11 Any one selected from hydrogen, unsubstituted or R'-substituted C1-C10 straight or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C3-C10 alkylsilyl, unsubstituted or R'-substituted C6-C20 aryloxy, unsubstituted or R'-substituted C6-C20 arylamino, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; further preferably any one selected from unsubstituted or R'-substituted C1-C5 straight or branched alkyl, unsubstituted or R'-substituted C3-C6 alkylsilyl, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl.

[0106] In one embodiment, R 14Any one selected from hydrogen, unsubstituted or R'-substituted C1-C10 straight or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C3-C10 alkylsilyl, unsubstituted or R'-substituted C6-C20 aryloxy, unsubstituted or R'-substituted C6-C20 arylamino, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; further preferably any one selected from unsubstituted or R'-substituted C1-C5 straight or branched alkyl, unsubstituted or R'-substituted C3-C6 alkylsilyl, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl.

[0107] For example, R 11 Any one selected from the following groups: methyl,

[0108]

[0109] -* represents the attachment site of the group.

[0110] Understandably, R 11 It can be selected from at least one of the above groups, or other groups that can meet the requirements. Those skilled in the art can select R according to actual conditions. 11 The specific structure.

[0111] In one embodiment, L is selected from any one of the following groups:

[0112]

[0113]

[0114] Wherein, -* represents the attachment site of the group; Y 11 , Y 12 , Y 13 , Y 14 , Y 15 , Y 16 , Y 17 , Y 18 , Y 19 Each independently selected from CR 21 or N; M3 is independently selected from O, S, NAr m2 or CR m5 R m6 Any one of Ar m2Any one selected from unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl; R 21 , R m5 , R m6 R is each independently selected from any one of hydrogen, halogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C2-C20 alkenyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'-substituted C3-C60 heteroaryl; R 21 Each independently is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; the R m5 With R m6 They are not connected to each other or are connected to form a ring through chemical bonds.

[0115] Exemplarily, L is selected from Any one of, further preferably, L is selected from Any one of .

[0116] In one embodiment, Y 11 , Y 12 , Y 13 , Y 14 , Y 15 , Y 16 Each independently is CR 21 ; R 21 Each is independently selected from any one of hydrogen, unsubstituted or R'-substituted C1-C10 straight or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl.

[0117] Exemplarily, L is selected from any one of the following groups:

[0118]

[0119]

[0120]

[0121] -* represents the attachment site of the group.

[0122] It can be understood that L can be selected from at least one of the above groups, and can also be selected from other groups that can meet the requirements. Those skilled in the art can select the specific structure of L according to actual conditions.

[0123] In a specific embodiment, the boron-containing luminescent dye includes a structure as shown in at least one of formulas M001-M832:

[0124]

[0125]

[0126]

[0127]

[0128]

[0129]

[0130]

[0131]

[0132]

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147]

[0148]

[0149]

[0150]

[0151]

[0152]

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163] Therefore, the above-mentioned boron-containing luminescent dye has a strong rigid structure, is a boron-containing resonance dye, exhibits a small Stokes shift, and has a narrow spectrum characteristic; moreover, the above-mentioned boron-containing luminescent dye can achieve △Est greater than or equal to 0.3eV through molecular design, and maintain a narrow spectrum emission characteristic. When the S1 energy level is consistent, the T1 energy level is lower, which can avoid the occurrence of TTA (triplet-triplet annihilation) and TPA (triplet-polaron annihilation) processes, reduce device efficiency roll-off, and improve device life. In addition, it can avoid the up-conversion process of the boron-containing luminescent dye itself from the T1 energy level to the S1 energy level, avoid the generation of long-lived excited state excitons in the boron-containing luminescent dye, which is beneficial to improving the device life.

[0164] It can be understood that, in addition to the structures shown in Formulas M001 to M832, the boron-containing luminescent dyes can also include other structures of boron-containing luminescent dyes. As long as they can meet the requirements, technicians in this field can make a selection according to actual conditions.

[0165] In one embodiment, the material of the light-emitting layer further comprises a host material and / or a sensitizing material. In one embodiment, the singlet energy level and triplet energy level of the host material are both higher than the triplet energy level of the sensitizing material.

[0166] Exemplarily, the sensitizing material includes a phosphorescent material.

[0167] Exemplarily, the △Est of the boron-containing luminescent dye is greater than or equal to 0.3eV, and the half-width at half maximum (FWHM) is less than 45nm; since the phosphorescent material itself has a wide half-width at half maximum, the use of phosphorescent materials to sensitize the narrow-spectrum boron-containing luminescent dye to make the boron-containing luminescent dye emit light can improve the problem of the wide half-width at half maximum of the phosphorescent material itself, and can achieve higher device efficiency and improve color purity.

[0168] In one embodiment, the host material includes a first host material and a second host material, the first host material and the second host material form an exciplex, and the singlet energy level and triplet energy level of the exciplex are higher than the triplet energy level of the phosphorescent material.

[0169] In one embodiment, the singlet state and triplet state energies of the exciplex are higher than the triplet state energy level of the boron-containing luminescent dye.

[0170] In one embodiment, the first host material is a hole transport host, the second host material is an electron transport 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 exciplex EX Satisfies the following relationship: S1 P >S1 N ≧S1 EX ; and / or, the singlet energy level S1 of the exciplex EX With its triplet energy level T1 EX Satisfies the following relationship: 0<S1 EX -T1 EX ≤0.3eV. Thus, the exciplex has delayed fluorescence characteristics. Exemplarily, S1 EX -T1 EX The value of can be 0.01eV, 0.05eV, 0.1eV, 0.15eV, 0.2eV, 0.25eV or 0.3eV, etc.

[0171] In one embodiment, the triplet energy level of the phosphorescent material is higher than the singlet and triplet energy levels of the boron-containing luminescent dye.

[0172] In one embodiment, the highest occupied orbital E of the hole transport host HOMO P and the lowest orbit E LUMO P , the highest occupied orbital E of the electron transport subject HOMO N and the lowest orbit E LUMO N Satisfaction: E HOMO P >E HOMO N , preferably, E HOMO P -E HOMO N >0.1eV; E LUMO P >E LUMO N , preferably, E LUMO P -E LUMO N >0.3eV. Through the design and reasonable matching of the triplet energy level, HOMO energy level / LUMO energy level of the two types of host materials, the host material in the light-emitting layer can balance the injection and transmission of carriers, constrain the size of the triplet energy difference between the two types of host materials, avoid the ineffective transfer of excitons between the two hosts, and improve the luminescence efficiency; at the same time, E LUMO P -E LUMO N When E > 0.3eV, the LUMO energy level difference between the two types of host materials is appropriate, which reduces the probability of exciton recombination in the hole transport host and increases the hole transport performance, further balancing the carrier transport, enhancing the effective transport of excitons, and improving the device life; E HOMO P -E HOMO N When >0.1eV, the HOMO energy level difference between the two types of host materials is appropriate, which reduces the probability of exciton recombination in the electron-transporting host and increases the electron transport performance, further balancing the carrier transport, enhancing the effective transport of excitons, and improving the device life.

[0173] For example, E LUMO P -E LUMO N The value of can be 0.35eV, 0.4eV, 0.5eV, 0.6eV or 0.7eV, etc.; E HOMOP -E HOMO N The value of can be 0.15eV, 0.2eV, 0.3eV, 0.4eV or 0.5eV, etc.

[0174] It should be noted that E HOMO P 、E LUMO P 、E HOMO N 、E LUMO N are negative values, E HOMO P >E HOMO N , then E HOMO P The absolute value is less than E HOMO N The absolute value of E LUMO P >E LUMO N , then E LUMO P The absolute value is less than E LUMO N The absolute value of .

[0175] In one embodiment, the first host material comprises a structure as shown in Formula VI:

[0176]

[0177] Among them, Ar 1 is selected from a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C3-C60 heteroaryl group; R 001 and R 002 Indicates zero to the maximum number of substituents allowed on the benzene ring, R 001 and R 002 Each is independently selected from 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, substituted or unsubstituted C3-C60 heteroaryl.

[0178] In one embodiment, the first host material has a structure as shown in Formula VI-1 or Formula VI-2:

[0179]

[0180] Wherein, m and n are each independently an integer of 1 to 4 (for example, 1, 2, 3 or 4, etc.); 2 ,Ar 3 ,Ar 4 Each is independently selected from a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C3-C60 heteroaryl group; R 003 ~R 010 represents the substituents ranging from zero to the maximum allowed on the benzene ring, each independently selected from 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 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl.

[0181] In one embodiment, Ar 2 ,Ar 2 ,Ar 4 Each independently selected from a combination of one or more 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 indolecarbazole, substituted or unsubstituted carbazole, and substituted or unsubstituted fluorene.

[0182] In one embodiment, the first host material includes one or more of the following compounds D-1 to D-85:

[0183]

[0184]

[0185]

[0186]

[0187] It is understandable that the first main material may include main materials of other structures in addition to compounds D-1 to D-85. As long as the requirements can be met, those skilled in the art may flexibly select according to actual conditions.

[0188] In one embodiment, the second host material includes a nitrogen-containing aromatic heterocyclic compound, and the second host has a structure shown in Formula VII:

[0189]

[0190] Wherein, each of Q1 to Q5 is independently selected from nitrogen or CR 011 , R 011 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; the adjacent R 011 Connect or don't connect.

[0191] Illustratively, the second host material includes one or more of the following compounds A1 to A86:

[0192]

[0193]

[0194]

[0195]

[0196]

[0197] It is understandable that the second main material may include main materials of other structures in addition to compounds A1 to A86. As long as the requirements can be met, those skilled in the art may flexibly select according to actual conditions.

[0198] It should be noted that the first host material and the second host material have good carrier transport capabilities and good energy level matching, and have good compatibility with phosphorescent materials and luminescent dyes containing boron elements.

[0199] It should be noted that after the first host material and the second host material of the embodiment of the present application form an excited complex, the triplet state (T1) of the excited complex itself can be upconverted to a singlet state (S1), and this part of energy can be transferred to the phosphorescent material and the boron-containing luminescent dye more quickly, which is beneficial to reduce the T1 energy quenching of the excited complex itself, improve the luminescence efficiency and increase the life of the device.

[0200] In one embodiment, the phosphorescent material comprises a structure as shown in at least one of formulas GPD-1 to GPD-47:

[0201]

[0202]

[0203] Therefore, the above-mentioned phosphorescent material has a more suitable emission spectrum and a higher self-luminous efficiency, and is well matched with the host material and the luminescent dye containing the boron element, so that the light-emitting device has better performance.

[0204] It is understandable that the phosphorescent material may include, in addition to compounds GPD-1 to GPD-47, phosphorescent materials of other structures. As long as the requirements can be met, those skilled in the art may flexibly select according to actual conditions.

[0205] In one embodiment, the mass of the phosphorescent material accounts for 0.1-50% of the total mass of the light-emitting layer (for example, it can be 0.1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, etc.), and the mass of the boron-containing luminescent dye accounts for 0.1-30% of the total mass of the light-emitting layer (for example, it can be 0.1%, 5%, 10%, 15%, 20%, 25% or 30%, etc.).

[0206] In a preferred embodiment, the mass of the phosphorescent material accounts for 0.1-30% of the total mass of the light-emitting layer. More preferably, the mass of the phosphorescent material accounts for 0.1-20% of the total mass of the light-emitting layer.

[0207] In one embodiment, the mass of the boron-containing luminescent dye accounts for 0.1-10% (for example, 0.1%, 2%, 5%, 8%, 10%, etc.) of the total mass of the luminescent layer. Further preferably, the mass of the boron-containing luminescent dye accounts for 0.1-5% of the total mass of the luminescent layer.

[0208] In one embodiment, referring to Figure 1 At least one light-emitting layer 210 includes a first light-emitting layer 211 , and the light-emitting functional layer 200 includes a first hole injection layer 220 . The first hole injection layer 220 is located between the first light-emitting layer 211 and the first electrode layer 100 .

[0209] In one embodiment, the first hole injection layer 220 includes a first compound and a second compound, wherein the first compound includes a structure as shown in at least one of Formulas HT-1 to HT-51:

[0210]

[0211]

[0212]

[0213] The second compound includes a structure as shown in at least one of Formulas HI-1 to HI-3:

[0214]

[0215] It is understood that the first compound may include first compounds of other structures in addition to the structures of formulae HT-1 to HT-51, and those skilled in the art may flexibly select the first compounds according to actual conditions as long as the requirements are met. The second compound may include second compounds of other structures in addition to the structures of formulae HI-1 to HI-3, and those skilled in the art may flexibly select the second compounds according to actual conditions as long as the requirements are met.

[0216] In one embodiment, the mass of the second compound is 0.1-30% of the total mass of the first compound and the second compound, for example, it can be 0.1%, 0.5%, 1%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, etc.

[0217] In one embodiment, referring to Figure 1 The light-emitting functional layer 200 further includes a first hole transport layer 230 , which is located between the first light-emitting layer 211 and the first hole injection layer 220 .

[0218] In one embodiment, the material of the first hole transport layer 230 includes a phthalocyanine derivative (such as CuPc), a conductive polymer, a polymer containing a conductive dopant (such as polyphenylene vinylene, polyaniline / dodecylbenzene sulfonic acid (Pani / DBSA), poly(3,4-ethylenedioxythiophene) / poly(4-styrene sulfonate)

[0219] At least one of (PEDOT / PSS), polyaniline / camphorsulfonic acid (Pani / CSA), polyaniline / poly(4-styrenesulfonate) (Pani / PSS) and aromatic amine derivatives, etc.).

[0220] In one embodiment, the aromatic amine derivative includes a structure as shown in at least one of Formulas HT-1 to HT-51, and Formulas HT-1 to HT-51 are consistent with the above description.

[0221] In one embodiment, referring to Figure 1 The light-emitting functional layer 200 further includes a first electron blocking layer 240 , which is located between the first light-emitting layer 211 and the first hole transport layer 230 .

[0222] In one embodiment, the material of the first electron blocking layer 240 includes a structure as shown in at least one of Formulas HT-1 to HT-51 and PH-47 to PH-77, wherein Formulas HT-1 to HT-51 are consistent with the above description, wherein the structural formulas of PH-47 to PH-77 are as follows:

[0223]

[0224]

[0225] It is understandable that the first electron blocking layer 240 may include structures having other structures in addition to those shown in formulas HT-1 to HT-51 and PH-47 to PH-77. As long as the requirements can be met, technicians in this field may flexibly choose according to actual conditions.

[0226] In one embodiment, referring to Figure 1 The light-emitting functional layer 200 further includes a first hole blocking layer 250 , which is located between the first light-emitting layer 211 and the second electrode layer 300 .

[0227] In one embodiment, the first hole blocking layer 250 includes a structure as shown in at least one of Formulas ET-1 to ET-73 and PH-1 to PH-46:

[0228]

[0229]

[0230]

[0231]

[0232] It is understandable that the first hole blocking layer 250 may include structures having other structures in addition to those shown in formulas HT-1 to HT-51 and PH-47 to PH-77. As long as the requirements can be met, technicians in this field may flexibly choose according to actual conditions.

[0233] In one embodiment, referring to Figure 1 The light-emitting functional layer 200 further includes a first electron transport layer 260 , which is located between the first hole blocking layer 250 and the second electrode layer 300 .

[0234] In one embodiment, the first electron transport layer 260 includes a structure as shown in at least one of Formulas ET-1 to ET-73, and Formulas ET-1 to ET-73 are consistent with the above description.

[0235] It is understandable that the first electron transport layer 260 may include structures having other structures in addition to those shown in Formulae ET-1 to ET-73. As long as the requirements can be met, those skilled in the art may flexibly select according to actual conditions.

[0236] In one embodiment, referring to Figure 1The light-emitting functional layer 200 further includes a first electron injection layer 270 , which is located between the first electron transport layer 260 and the second electrode layer 300 .

[0237] In one embodiment, the first electron injection layer includes one or more of LiQ, LiF, NaCl, CsF, Li2O, Cs2CO3, BaO, Na, Li, Ca, Mg, or Yb.

[0238] In one embodiment, referring to Figure 2 , between the first electron transport layer 260 and the first electron injection layer 270, the light-emitting functional layer 200 further includes at least one light-emitting functional unit 280. It should be noted that, Figure 2 Only two light-emitting functional units 280 are shown, which should not be construed as limiting the present application; the number of light-emitting functional units 280 may be 1, 2, 3, 4 or 5, etc. It is understood that when the light-emitting functional layer 200 includes a plurality of light-emitting functional units 280, the plurality of light-emitting functional units 280 are stacked.

[0239] In one embodiment, referring to Figure 3 The light-emitting functional unit 280 includes at least one of an n-type charge generation layer 281, a p-type charge generation layer 282, a second hole transport layer 283, a second electron blocking layer 284, a second light-emitting layer 285, a second hole blocking layer 286 and a second electron transport layer 287. It should be noted that Figure 3 Only the case of one light-emitting functional unit 280 is shown, which should not be understood as a limitation to the present application; the number of the light-emitting functional units 280 may be one, two, three, four or five, etc.

[0240] In one embodiment, the n-type charge generation layer 281, the p-type charge generation layer 282, the second hole transport layer 283, the second electron blocking layer 284, the second light-emitting layer 285, the second hole blocking layer 286 and the second electron transport layer 287 are stacked in sequence, the n-type charge generation layer 281 is located on the side of the p-type charge generation layer 282 close to the first electron transport layer 260, and the second electron transport layer 287 is located on the side of the second hole blocking layer 286 close to the first electron injection layer 270.

[0241] In one embodiment, the second hole blocking layer 286 is made of the same material as the first hole blocking layer 250; and / or, the second electron transport layer 287 is made of the same material as the first electron transport layer 260; and / or, the second hole transport layer 283 is made of the same material as the first hole transport layer 230; and / or, the second electron blocking layer 284 is made of the same material as the first electron blocking layer 240. In other embodiments, specific materials may be provided according to actual conditions. That is, the second hole blocking layer 286 may be made of a different material from the first hole blocking layer 250; or, the second electron transport layer 287 may be made of a different material from the first electron transport layer 260; or, the second hole transport layer 283 may be made of a different material from the first hole transport layer 230; or, the second electron blocking layer 284 may be made of a different material from the first electron blocking layer 240.

[0242] In one embodiment, the n-type charge generation layer 281 includes an organic matrix material; the organic matrix material includes an o-phenanthroline compound.

[0243] Exemplarily, the o-phenanthroline compound includes a structure as shown in at least one of formulas CGL-1 to CGL-12:

[0244]

[0245] In one embodiment, the n-type charge generation layer 281 further includes a doping material, and the doping material includes at least one of a metal, a metal oxide, and a metal salt.

[0246] In one embodiment, the mass of the doping material accounts for 0.1-20% (eg, 0.1%, 5%, 10%, 15%, 20%, etc.) of the total mass of the n-type charge generation layer 281 .

[0247] In one embodiment, the metal salt includes at least one of Liq, LiF, NaCl, CsF and Cs2CO3; and / or, the metal oxide includes Li2O and / or BaO; and / or, the metal includes at least one of Na, Li, Ca, Mg, Ag and Yb.

[0248] In one embodiment, the p-type charge generation layer 282 includes a first compound and a second compound, the first compound includes a structure as shown in at least one of formulas HT-1 to HT-51; the second compound includes a structure as shown in at least one of formulas HI-1 to HI-3; HT-1 to HT-51 and HI-1 to HI-3 are consistent with the previous description and will not be repeated here.

[0249] In one embodiment, the content of the second compound accounts for 0.1-30% (for example, 0.1%, 5%, 10%, 15%, 20%, 25% or 30%) of the total mass of the first compound and the second compound.

[0250] In one embodiment, the first light-emitting layer 211 includes multiple layers of first sub-light-emitting layers, and the material of at least one first sub-light-emitting layer includes a luminescent dye containing a boron element, and the singlet and triplet energy level difference of the luminescent dye containing a boron element is greater than or equal to 0.3 eV; and / or, the second light-emitting layer 285 includes multiple layers of second sub-light-emitting layers, and the material of at least one second sub-light-emitting layer includes a luminescent dye containing a boron element, and the singlet and triplet energy level difference of the luminescent dye containing a boron element is greater than or equal to 0.3 eV. Specifically, the multiple layers can be two or more layers. In one embodiment, the first light-emitting layer 211 includes two layers of first sub-light-emitting layers, and the second light-emitting layer 285 includes two layers of second sub-light-emitting layers. In one embodiment, the material of at least one first sub-light-emitting layer includes a host material, a sensitizing material, and a luminescent dye containing a boron element, and the singlet and triplet energy level difference of the luminescent dye containing a boron element is greater than or equal to 0.3 eV. In one embodiment, the material of at least one second sub-light-emitting layer includes a host material, a sensitizing material, and a luminescent dye containing boron, and the energy level difference between the singlet and triplet states of the luminescent dye containing boron is greater than or equal to 0.3 eV.

[0251] In one embodiment, referring to Figure 1 and Figure 2 The light emitting device further includes a light extraction layer 400, which is located on the side of the second electrode layer 300 away from the light emitting functional layer 200. The light extraction layer 400 is used to adjust the top emitting microcavity, and adjust the light color and efficiency of the top emitting device.

[0252] In one embodiment, the light extraction layer 400 includes a structure as shown in at least one of formulas CPL-1 to CPL-3:

[0253]

[0254] In one embodiment, the thickness of the light extraction layer 400 is For example, it can be 500

[0255]

[0256] wait.

[0257] Exemplarily, one of the first electrode layer 100 and the second electrode layer 300 is an anode, and the other of the first electrode layer 100 and the second electrode layer 300 is a cathode.

[0258] Exemplarily, the light emitting device further comprises a substrate, and the anode can be formed on the substrate by sputtering or depositing the anode material, and the remaining layers can be formed by conventional methods in the art such as vacuum thermal evaporation, spin coating, printing, etc., which will not be described in detail. Among them, the substrate can be glass or polymer material with excellent mechanical strength, thermal stability, waterproofness, and transparency. In addition, the substrate used as a display can also have a thin film transistor (TFT).

[0259] Exemplarily, the anode material includes transparent conductive oxide materials such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2), zinc oxide (ZnO), and any combination thereof; the cathode material can be metals or alloys such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), and any combination thereof.

[0260] In some embodiments, the light-emitting device may be a top-emitting device (or a top-emitting device), and the substrate structure with an anode may be a top-emitting substrate structure conventionally used in the art for top-emitting devices. For example, the substrate structure with an anode includes an ITO layer, a silver layer, and an ITO layer stacked in sequence, and the thicknesses thereof may be respectively

[0261] Illustratively, in the light-emitting device of the embodiment of the present application, the main material, the phosphorescent material and the luminescent dye containing the boron element cooperate with each other, and the film layers in the light-emitting functional layer cooperate with each other, so that excellent device performance can be obtained, which is suitable for industrial application.

[0262] Optionally, the light emitting device of the embodiment of the present application can emit green light, blue light or red light, etc. The light emitting device of the embodiment of the present application is a pTSF (phosphor-assisted TADF-sensitized fluorescence) device.

[0263] The second aspect of the present application provides a light-emitting device, comprising: a first electrode layer, a light-emitting functional layer, and a second electrode layer stacked in sequence; the light-emitting functional layer comprises at least one light-emitting layer, the material of the light-emitting layer comprises a light-emitting dye containing a boron element, a main material, and a sensitizing material, and the half-peak width of the light-emitting dye containing a boron element is less than 45nm. The half-peak width of the light-emitting dye containing a boron element is relatively narrow, and the energy of the sensitizing material with a relatively wide half-peak width in the light-emitting layer can be transferred to the light-emitting dye containing a boron element with a narrow spectrum to realize light emission, and the light-emitting device has excellent effects on improving the light-emitting efficiency and color purity, and can greatly improve the performance of the light-emitting device.

[0264] It should be noted that the first electrode layer, the light-emitting functional layer and the second electrode layer are consistent with the above description and will not be described in detail here.

[0265] It should be noted that the light emitting device of this embodiment can be described in whole or in part with the light emitting device described above, and will not be described in detail here.

[0266] In a preferred embodiment, the half-peak width of the luminescent dye containing the boron element is less than 35 nm.

[0267] Exemplarily, the luminescent dye containing boron element comprises a structure as shown in formula (I):

[0268]

[0269] Among them, X 1 , X 2 , X 3 , X 4 Each independently selected from CR A1 or N;

[0270] Y 1 , Y 2 , Y 3 , Y 4 Each independently selected from CR A2 or N;

[0271] Z 1 , Z 2 , Z 3 Each independently selected from CR A3 or N;

[0272] R A1 , R A2 , R A3 each independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3At least one group of them is connected by a chemical bond to form a ring F, wherein the ring F is selected from any one of a substituted or unsubstituted C6-C60 aromatic ring and a substituted or unsubstituted C3-C60 heteroaromatic ring; R A1 , R A2 , R A3 In the formula, the other groups except those forming the ring F are independently not connected to the adjacent ring structure or are connected to form a ring through a chemical bond; Ar1 ​​and Ar2 are independently selected from unsubstituted or R B Substituted C6-C60 aryl, unsubstituted or R B Any one of substituted C3-C60 heteroaryl groups; Ar1 ​​and Ar2 are independently not connected to adjacent ring structures or are connected to form a ring through chemical bonds; R B any one selected from halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; R B Not connected to adjacent ring structures or connected to form a ring through chemical bonds; R A1 , R A2 , R A3 、Ring F、R B The substituted substituents are each independently selected from halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano , nitro, 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; the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by chemical bonds; R A1 , R A2 , R A3 At least one of the groups is RX , and / or, R B At least one of the groups is R X .

[0273] For example, R X It has the structure shown in formula a:

[0274]

[0275] Wherein, -* represents the attachment site of the group;

[0276] L is selected from any one of a substituted or unsubstituted C6-C60 arylene group and a substituted or unsubstituted C3-C60 heteroarylene group; X 11 , X 12 , X 13 , X 18 , X 19 , X 20 Each independently selected from C, CR C1 or N, and one of them is C, and the C is connected to L; X 14 , X 15 , X 16 , X 17 Each independently selected from CR C1 or any one of N; R C1 is selected from hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, unsubstituted or R'substituted C6-C30 arylamino, unsubstituted or R'substituted C3-C30 heteroaryl any one of alkylamino, unsubstituted or R'substituted C6-C30 aryloxy, unsubstituted or R'substituted C3-C30 heteroaryloxy, unsubstituted or R'substituted C6-C60 aryl, and unsubstituted or R'substituted C3-C60 heteroaryl; the substituents in L are each independently selected from halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20

[0277] any one of substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'-substituted C3-C60 heteroaryl; R' is selected from halogen , cyano, nitro, hydroxyl, amino, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C60 aryl, C3-C60 heteroaryl, any one or a combination of at least two; adjacent R's are not connected or are connected to form a ring by chemical bonds; the R' is not connected to the adjacent ring structure or is connected to form a ring by chemical bonds.

[0278] In one embodiment, at least one light-emitting layer 210 includes a first light-emitting layer 211, and the light-emitting functional layer 200 includes a first hole injection layer 220, the first hole injection layer 220 is located between the first light-emitting layer 211 and the first electrode layer 100; the first hole transport layer 230 is located between the first light-emitting layer 211 and the first hole injection layer 220; the first electron blocking layer 240 is located between the first light-emitting layer 211 and the first hole transport layer 230; the first hole blocking layer 250 is located between the first light-emitting layer 211 and the second electrode layer 300; the first electron transport layer 260 is located between the first hole blocking layer 250 and the second electrode layer 300; and the first electron injection layer 270 is located between the first electron transport layer 260 and the second electrode layer 300.

[0279] In one embodiment, between the first light-emitting layer and the second hole blocking layer, the light-emitting functional layer further includes at least one of a first hole blocking layer, a first electron transport layer, an n-type charge generation layer, a p-type charge generation layer, a second hole transport layer, a second electron blocking layer and a second light-emitting layer.

[0280] In one embodiment, a first hole blocking layer, a first electron transport layer, an n-type charge generating layer, a p-type charge generating layer, a second hole transport layer, a second electron blocking layer and a second light-emitting layer are sequentially stacked, the first hole blocking layer is located on a side of the first electron transport layer close to the first light-emitting layer, and the second light-emitting layer is located on a side of the second electron blocking layer close to the second hole blocking layer.

[0281] The light emitting functional layer 200 further includes at least one light emitting functional unit 280 between the first electron transport layer 260 and the first electron injection layer 270 .

[0282] In one embodiment, the light-emitting functional unit 280 includes at least one of an n-type charge generation layer 281, a p-type charge generation layer 282, a second hole transport layer 283, a second electron blocking layer 284, a second light-emitting layer 285, a second hole blocking layer 286 and a second electron transport layer 287.

[0283] In one embodiment, the n-type charge generation layer 281, the p-type charge generation layer 282, the second hole transport layer 283, the second electron blocking layer 284, the second light-emitting layer 285, the second hole blocking layer 286 and the second electron transport layer 287 are stacked in sequence, the n-type charge generation layer 281 is located on the side of the p-type charge generation layer 282 close to the first electron transport layer 260, and the second electron transport layer 287 is located on the side of the second hole blocking layer 286 close to the first electron injection layer 270.

[0284] In one embodiment, the first light-emitting layer 211 includes multiple layers of first sub-light-emitting layers, and the material of at least one first sub-light-emitting layer includes a luminescent dye containing a boron element; and / or, the second light-emitting layer 285 includes multiple layers of second sub-light-emitting layers, and the material of at least one second sub-light-emitting layer includes a luminescent dye containing a boron element. Specifically, the multiple layers can be two or more layers. In one embodiment, the first light-emitting layer 211 includes two layers of first sub-light-emitting layers, and the second light-emitting layer 285 includes two layers of second sub-light-emitting layers. In one embodiment, the material of at least one first sub-light-emitting layer includes a host material, a sensitizing material, and a luminescent dye containing a boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing the boron element is greater than or equal to 0.3eV. In one embodiment, the material of at least one second sub-light-emitting layer includes a host material, a sensitizing material, and a luminescent dye containing a boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing the boron element is greater than or equal to 0.3eV.

[0285] In one embodiment, the light emitting device further includes a light extraction layer 400 located on a side of the second electrode layer 300 away from the light emitting functional layer 200 .

[0286] It should be noted that the light emitting functional layer 200 , the light extraction layer 400 , the first electrode layer 100 and the second electrode layer 300 of this embodiment are consistent with the above description and will not be described in detail here.

[0287] A third aspect of the present application provides a display panel, which includes the above-mentioned light-emitting device.

[0288] It should be noted that, in addition to the above-mentioned light-emitting devices, the display panel may also include structures that a conventional display panel should have, such as an array substrate, etc., which will not be described in detail here.

[0289] The light-emitting device of the present application is further described below in conjunction with specific embodiments. It should be noted that the following embodiments are only used to explain the present application and cannot be understood as limiting the present application.

[0290] Related test methods

[0291] (1) Device current efficiency test:

[0292] In the following embodiments and comparative examples, a digital source meter and PR650 were used to measure the current efficiency of the light-emitting devices provided in the device embodiments and comparative examples. Specifically, the voltage was increased at a rate of 0.1 V per second. When the brightness of the light-emitting device reached 10000 cd / m 2 When the current efficiency (CE) of the light emitting device is

[0293] After measuring the current efficiency (CE) of the light-emitting devices of each embodiment and comparative example, the ratio of the measured current efficiency of the light-emitting devices of each embodiment and comparative example to the device current efficiency of Comparative Example 1 was calculated as the efficiency ratio.

[0294] (2) Device life test:

[0295] The life test of LT95 (the time required for the device brightness to decay to 95% of the original brightness) is as follows: Use a brightness meter at 20000cd / m 2 At the same brightness, the current is kept constant and the brightness of the organic electroluminescent device is measured to drop to 19000cd / m 2 The life of the LT95 of Comparative Example 1 is taken as a benchmark (100%), and the life of the devices of the other embodiments is compared with it in percentage.

[0296] Example 1

[0297] The light-emitting device of this embodiment is a top-emitting single-layer device, and the preparation method is as follows:

[0298] (1) The top-emitting substrate coated with an ITO conductive layer (anode) was ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in an acetone:ethanol mixed solvent, baked in a clean environment until the water was completely removed, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam;

[0299] (2) Place the top-emitting substrate with the ITO conductive layer in a vacuum chamber and evacuate the chamber to a vacuum level less than 1×10 -5Pa, HT-28 material and HI-2 material are co-evaporated on the anode layer as a hole injection layer, the proportion of HI-2 material is 3%, and the evaporation rate of HT-28 material is The total film thickness of the evaporated layer (i.e. the thickness of the hole injection layer) is Among them, 3% is based on the sum of the mass of HT-24 material and HI-2 material as 100%, that is, the total mass of the hole injection layer is 100%. The percentages involved below are all based on the total mass of the corresponding functional layer as 100%. In addition, the total film thickness of the vapor deposition is the thickness of the corresponding functional layer formed by vapor deposition, which is not repeated one by one;

[0300] (3) Vacuum evaporation of a hole transport layer on the hole injection layer, using HT-28 as the material at a deposition rate of The total film thickness of the vapor deposition is

[0301] (4) Vacuum evaporation of an electron blocking layer on the hole transport layer, using HT-29 as the material at a evaporation rate of The total film thickness of the vapor deposition is

[0302] (5) A light-emitting layer was vacuum co-evaporated on the electron blocking layer. The light-emitting layer included 94% of a premixed host of host materials A85 and D-83 (the mass ratio of A85 to D-83 was 1:1), 5% of a phosphorescent sensitizer GPD-23, and 1% of a luminescent dye M001 containing a boron element. The deposition was performed by a multi-source co-evaporation method. The evaporation rate of the host material was The total film thickness of the vapor deposition is

[0303] (6) Vacuum evaporation of a hole blocking layer on the light-emitting layer. The material is PH-31 and the evaporation rate is / s, the total evaporation film thickness is

[0304] (7) ET-52 material and ET-57 material were vacuum co-evaporated on the hole blocking layer as the electron transport layer. The mass ratio of the two materials was 1:1. The evaporation rates of the two materials were The total film thickness of the vapor deposition is

[0305] (8) The thickness of the vacuum evaporation on the electron transport layer is Yb material as the electron injection layer;

[0306] (9) Mg and Ag materials are evaporated on the electron transport layer as the cathode, and the mass ratio of the two is 1:9 (i.e., Mg:Ag = 1:9). The total film thickness of the evaporated film is

[0307] (10) CPL-3 material is evaporated on the cathode as a light extraction layer. The CPL-3 evaporation rate is The total film thickness of the vapor deposition is

[0308] Example 2-41: The only difference from Example 1 is that the type of the luminescent dye containing the boron element in the luminescent layer is different, see Table 1 for details, and the other conditions are the same.

[0309] Examples 42-55: The only difference from Example 1 is that the types of host materials in the light-emitting layer are different, see Table 1 for details, and the other conditions are the same.

[0310] Embodiments 56-60: The only difference from Embodiment 1 is that the types of phosphorescent materials in the light-emitting layer are different, as shown in Table 1, and the other conditions are the same;

[0311] Examples 61-65: The difference from Example 1 is that in the light-emitting layer, the content of the main material, the type and content of the boron-containing luminescent dye are different, see Table 1 for details, and the other conditions are the same.

[0312] Examples 66-70: The difference from Example 1 is that in the light-emitting layer, the content of the main material and the content of the phosphorescent dye are different, and the type and content of the luminescent dye containing the boron element are different, as shown in Table 1 for details, and the other conditions are the same.

[0313] Examples 71-83: The difference from Example 1 is that in the light-emitting layer, the types of phosphorescent materials are different, and the types of luminescent dyes containing boron elements are different, as shown in Table 1 for details. The other conditions are the same.

[0314] Examples 84-90: The difference from Example 1 is that in the light-emitting layer, the types and proportions of the main material, phosphorescent material and the luminescent dye containing the boron element are different, as shown in Table 1 for details, and the other conditions are the same.

[0315] Comparative Example 1: The only difference from Example 1 is that the luminescent layer does not include a luminescent dye containing a boron element, as shown in Table 1, and the other conditions are the same.

[0316] Comparative Example 2: The only difference from Example 1 is that the luminescent dye containing boron element in the luminescent layer is D1, as shown in Table 1, and the other conditions are the same.

[0317] The current efficiency-brightness relationship diagram of the light emitting device of Example 1 and Comparative Example 1 can be referred to Figure 5 The brightness-time relationship diagram of the light emitting device of Example 1 and Comparative Example 1 can be referred to Figure 6 .

[0318] The selection and composition of the main material, the selection and content of the phosphorescent material, and the selection and content of the luminescent dye containing the boron element in the light-emitting devices of Examples 1 to 90 and Comparative Examples 1 to 2 are shown in Table 1 below. The performance and life of the light-emitting devices of Examples 1 to 90 are also shown in Table 1 below:

[0319] Table 1

[0320]

[0321]

[0322]

[0323]

[0324]

[0325] *Indicates the mass ratio of the two main materials, the mass content ratio of the two main materials in the light-emitting layer. Taking "A85:D83=1:1,94%" as an example, it means: in the first light-emitting layer (or the second light-emitting layer), the mass ratio of A85 to D83 is 1:1, and the ratio of the sum of the masses of A85 and D83 to the total mass of the first light-emitting layer is 94%.

[0326] In Table 1, the molecular formula of D1 is

[0327] The energy level difference ΔEst between the singlet state and the triplet state of the boron-containing luminescent dye involved in Examples 1-90 and Comparative Example 2, and the half-peak width FWHM of the boron-containing luminescent dye are shown in Table 2 below:

[0328] Table 2

[0329]

[0330]

[0331] The test method of △Est is as follows: the S1 energy level and T1 energy level of the molecule can be respectively measured at room temperature and low temperature (77K) according to the solution spectrum of the boron-containing luminescent material in toluene (concentration 1×10 -5 mol / L), which is calculated by the peak values ​​of the autofluorescence emission spectrum and the phosphorescence emission spectrum, and then △Est is calculated by the difference between S1 and T1.

[0332] The test method of half-peak width FWHM is as follows: Test the spectrum of the luminescent dye containing boron element in toluene at room temperature (concentration 1×10 -5 mol / L), and the half-peak width was calculated from the fluorescence emission spectrum.

[0333] It can be seen from Table 1 that, relative to the light-emitting device of Comparative Example 1, the light-emitting layer in the light-emitting device of Example 1-90 is a phosphorescence-sensitized light-emitting layer, that is, the light-emitting layer includes a main material, a phosphorescent material, and a narrow-spectrum boron-containing luminescent dye. The performance efficiency of the light-emitting device of Example 1-90 is equivalent to or improved upon that of the light-emitting device of Comparative Example 1, and the lifespan is significantly improved. It can be seen from Tables 1 and 2 that, relative to Comparative Example 2, Comparative Example 2 uses D1 material with △Est<0.3eV as the luminescent dye, and Example 1-90 uses a material with △Est>0.3eV as the luminescent dye. It can be found that when a material with △Est>0.3eV is used as the luminescent dye, the lifespan of the light-emitting device is significantly improved.

[0334] Embodiment 91

[0335] The light-emitting device of this embodiment is a top-emitting stacked device, and the preparation method is as follows:

[0336] (1) The top-emitting substrate coated with an ITO conductive layer (anode) was ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in an acetone:ethanol mixed solvent, baked in a clean environment until the water was completely removed, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam;

[0337] (2) Place the top-emitting substrate with the ITO conductive layer in a vacuum chamber and evacuate the chamber to a vacuum level less than 1×10 -5 Pa, HT-28 material and HI-2 material are co-evaporated on the anode layer as the first hole injection layer, the proportion of HI-2 material is 3%, and the evaporation rate of HT-28 material is The total film thickness of the evaporated film (i.e. the thickness of the first hole injection layer) is Among them, 3% is based on the sum of the mass of the HT-24 material and the HI-2 material as 100%, that is, the total mass of the second hole injection layer is 100%. The percentages involved below are all based on the total mass of the corresponding functional layer as 100%. In addition, the total film thickness of the vapor deposition is the thickness of the corresponding functional layer formed by vapor deposition, which is not repeated one by one;

[0338] (3) Vacuum evaporation of the first hole transport layer on the first hole injection layer, using HT-28 as the material at a evaporation rate of The total film thickness of the vapor deposition is

[0339] (4) Vacuum evaporation of the first electron blocking layer on the first hole transport layer is performed using HT-29 as the material at a evaporation rate of The total film thickness of the vapor deposition is

[0340] (5) Vacuum co-evaporation of a first light-emitting layer on the first electron blocking layer, wherein the first light-emitting layer comprises 94% of a premixed host of host materials A85 and D83 (the mass ratio of A85 to D-83 is 1:1), 5% of a phosphorescent sensitizer GPD-23, and 1% of a luminescent dye containing a boron element M001, and the evaporation is performed by a multi-source co-evaporation method. The evaporation rate of the host material is The total film thickness of the vapor deposition is

[0341] (6) Vacuum evaporation of a first hole blocking layer on the first light-emitting layer, the material of which is PH-31, at a evaporation rate of The total film thickness of the vapor deposition is

[0342] (7) Vacuum co-evaporation of ET-52 material and ET-57 material on the first hole blocking layer as the first electron transport layer, the mass ratio of the two is 1:1, and the evaporation rate of the two is The total film thickness of the vapor deposition is

[0343] (8) CGL-3 material and metal Yb were co-evaporated on the first electron transport layer as an n-type charge generation layer. The CGL-3 evaporation rate was The proportion of metal Yb is 3%, and the total thickness is

[0344] (9) HI-2 and HT-28 materials are evaporated on the n-type charge generation layer as the p-type charge generation layer. The HT-28 evaporation rate is The proportion of HI-2 is 7% and the total thickness is

[0345] (10) A second hole transport layer was vacuum-deposited on the p-type charge generation layer. The material used was HT-28 and the deposition rate was The total film thickness of the vapor deposition is

[0346] (11) Vacuum evaporation of a second electron blocking layer on the second hole transport layer was performed using HT-29 as the material at a evaporation rate of The total film thickness of the vapor deposition is

[0347] (12) A second light-emitting layer was vacuum co-evaporated on the second electron blocking layer. The second light-emitting layer included 94% of a premixed host of host materials A85 and D-83 (the mass ratio of A85 to D-83 was 1:1), 5% of a phosphorescent sensitizer GPD-23, and 1% of a luminescent dye M001 containing a boron element. The deposition was performed by a multi-source co-evaporation method. The evaporation rate of the host material was The total film thickness of the vapor deposition is

[0348] (13) Vacuum evaporation of a second hole blocking layer on the second light-emitting layer was performed. The material was PH-31 and the evaporation rate was The total film thickness of the vapor deposition is

[0349] (14) ET-52 material and ET-57 material were vacuum co-evaporated on the second hole blocking layer as the second electron transport layer. The mass ratio of the two materials was 1:1. The evaporation rates of the two materials were The total film thickness of the vapor deposition is

[0350] (15) The thickness of the vacuum evaporation on the second electron transport layer is Yb material as the first electron injection layer;

[0351] (16) Mg and Ag materials are evaporated on the first electron injection layer as the cathode, with a mass ratio of 1:9 (i.e., Mg:Ag = 1:9), and the total film thickness is

[0352] (17) CPL-3 material is evaporated on the cathode as a light extraction layer. The CPL-3 evaporation rate is The total film thickness of the vapor deposition is

[0353] Examples 92-111: The only difference from Example 1 is that the types of the luminescent dye containing the boron element in the first luminescent layer and the second luminescent layer are different, see Table 3 for details, and the other conditions are the same.

[0354] Examples 112-119: The only difference from Example 1 is that the types of the host material and the luminescent dye containing the boron element in the first luminescent layer and the second luminescent layer are different, see Table 3 for details, and the other conditions are the same.

[0355] Examples 120-122: The only difference from Example 1 is that the types of phosphorescent materials and the types of luminescent dyes containing boron elements in the first light-emitting layer and the second light-emitting layer are different, see Table 3 for details, and the other conditions are the same.

[0356] Examples 123-127: The only difference from Example 1 is that the content of the main material, the type and content of the boron-containing luminescent dye in the first light-emitting layer and the second light-emitting layer are different, see Table 3 for details, and the other conditions are the same.

[0357] Examples 128-131: The only difference from Example 1 is that the content of the main material, the content of the phosphorescent material and the type of the luminescent dye containing the boron element in the first light-emitting layer and the second light-emitting layer are different, see Table 3 for details, and the other conditions are the same.

[0358] Example 132: The only difference from Example 1 is that the second light-emitting layer does not have a luminescent dye containing boron element, see Table 3 for details, and the other conditions are the same as Example 1.

[0359] Example 133: The only difference from Example 1 is that the first light-emitting layer does not have a luminescent dye containing boron element, see Table 3 for details, and the other conditions are the same as those of Example 1.

[0360] The preparation methods of the light-emitting devices of Comparative Examples 3-5 are basically the same as those of Example 1, except for the composition of the first light-emitting layer and the second light-emitting layer, as shown in Table 3 below.

[0361] The efficiency ratios and lifespans of the light-emitting devices of Examples 91-133 and Comparative Examples 3-5 are shown in Table 3 below.

[0362] Table 3

[0363]

[0364]

[0365]

[0366] *Indicates the mass ratio of the two main materials and the mass content ratio of the two main materials in the light-emitting layer. Taking "A85: D83 = 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 A85 to D83 is 1:1, and the sum of the mass of A85 and D83 accounts for 94% of the total mass of the first light-emitting layer.

[0367] It can be seen from Table 3 that, relative to the light-emitting device of Comparative Example 3, at least one light-emitting layer in the light-emitting devices of Examples 91 to 133 is a phosphorescence-sensitized light-emitting layer, that is, the light-emitting layer includes a main material, a phosphorescent material, and a narrow-spectrum boron-containing luminescent dye. The performance efficiency of the light-emitting devices of Examples 91 to 133 is equivalent to or improved on that of the light-emitting device of Comparative Example 3, and the lifespan is significantly improved. Relative to the light-emitting devices of Comparative Examples 4 and 5, the material D1 with △Est<0.3eV is used as the luminescent dye in Comparative Examples 4 and 5, and the material D1 with △Est>0.3eV is used as the luminescent dye in the light-emitting devices of Examples 91 to 133. It can be found that when the material with △Est>0.3eV is used as the luminescent dye, the lifespan of the light-emitting device is significantly improved.

[0368] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0369] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A light emitting device, characterized in that: include: A first electrode layer, a light-emitting functional layer, and a second electrode layer are sequentially stacked; The light-emitting functional layer comprises at least one light-emitting layer, the material of the light-emitting layer comprises a luminescent dye containing boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing boron element is greater than or equal to 0.3 eV.

2. The light emitting device according to claim 1, characterized in that: The energy level difference between the singlet state and the triplet state of the boron-containing luminescent dye is greater than or equal to 0.4 eV; Preferably, the half-peak width of the boron-containing luminescent dye is less than 45 nm; Preferably, the half-peak width of the boron-containing luminescent dye is less than 35 nm; Preferably, the boron-containing luminescent dye is a resonance luminescent dye.

3. The light emitting device according to claim 1, characterized in that: The boron-containing luminescent dye comprises a structure as shown in formula (I): Among them, X 1 , X 2 , X 3 , X 4 Each independently selected from CR A1 or N; Y 1 , Y 2 , Y 3 , Y 4 Each independently selected from CR A2 or N; Z 1 , Z 2 , Z 3 Each independently selected from CR A3 or N; R A1 , R A2 , R A3 Each is independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; Any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 At least one group of them is connected by a chemical bond to form a ring F, wherein the ring F is selected from any one of a substituted or unsubstituted C6-C60 aromatic ring and a substituted or unsubstituted C3-C60 heteroaromatic ring; The R A1 , R A2 , R A3 In the above, the other groups except those forming the ring F are independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds; Ar1 and Ar2 are each independently selected from unsubstituted or R B Substituted C6-C60 aryl, unsubstituted or R B Any one of substituted C3-C60 heteroaryl groups; Ar1 ​​and Ar2 are independently not connected to adjacent ring structures or are connected to form a ring through chemical bonds; The R B is selected from any one of halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; said R B Not connected to adjacent ring structures or connected to form a ring through chemical bonds; The R A1 , R A2 , R A3 、Ring F、R B The substituted substituents are each independently selected from halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano , nitro, 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; the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by chemical bonds; The R A1 , R A2 , R A3 At least one of them is a group R X , and / or, the R B At least one of them is a group R X ; The R X It has the structure shown in formula a: Wherein, -* represents the attachment site of the group; L is selected from any one of a substituted or unsubstituted C6-C60 arylene group and a substituted or unsubstituted C3-C60 heteroarylene group; X 11 , X 12 , X 13 , X 18 , X 19 , X 20 Each independently selected from C, CR C1 or N, one of which is C, and the C is connected to L; X 14 , X 15 , X 16 , X 17 Each independently selected from CR C1 or any one of N; R C1 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; The substituents substituted in L are each independently selected from any one of halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; The R' is selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C60 aryl, and C3-C60 heteroaryl; adjacent R's are not connected or are connected to form a ring by chemical bonds; the R' is not connected to adjacent ring structures or is connected to form a ring by chemical bonds.

4. The light emitting device according to claim 3, characterized in that: The boron-containing luminescent dye comprises a structure as shown in formula (IA): Among them, the X 1 , X 2 , X 3 , X 4 , Y 1 , Y 2 , Y 3 , Y 4 , Z 1 , Z 2 , Z 3 , Ar2 has the same defined range as in the formula (I); X 5 , X 6 , X 7 , X 8 , X 9 Each independently selected from CR A4 or N; R A4 any one selected from hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; any one of the two adjacent R A4 are not connected or connected to form a ring through chemical bonds; the R A4 Not connected to adjacent ring structures or connected to form a ring through chemical bonds; Preferably, the boron-containing luminescent dye comprises a structure as shown in formula (II): Preferably, any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 Any two adjacent R A4 At least one group of them is connected by chemical bonds to form the ring F, and the ring F has a structure as shown in formula b: Among them, the dotted lines represent fused bonds; Q1, Q2, Q3, Q4 are each independently selected from CR D1 or N; R D1 is selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; the R D1 Not connected to adjacent ring structures or connected to form a ring through chemical bonds; M1 and M2 are each independently selected from a single bond, O, S, Se, NAr m1 , CR m1 R m2 or SiR m3 R m4 Any one of; at most one of M1 and M2 is a single bond; Ar m1 Any one selected from unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl; R m1 , R m2 , R m3 , R m4 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C6-C60 aryl, and unsubstituted or R'substituted C3-C60 heteroaryl; the R m1 With R m2 are not connected or connected to form a ring through chemical bonds; the R m3 With R m4 They are not connected to each other or connected to form a ring through chemical bonds; Preferably, the M1 is selected from O, S, NAr m1 or CR m1 R m2 Any one of: wherein M2 is a single bond; Preferably, any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 Any two adjacent R A4 At most four groups in are connected by chemical bonds to form the ring F; Preferably, any two adjacent R A1 Any two adjacent R A4 A group of said R is connected by a chemical bond to form said ring F; and / or any two adjacent said R A2 A group of them are connected by chemical bonds to form the ring F; Preferably, any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 Any two adjacent R A4 A group of them is connected by chemical bonds to form the ring F.

5. The light emitting device according to claim 4, characterized in that: The boron-containing luminescent dye comprises a structure as shown in at least one of formula (III-1) to formula (III-14): Wherein, the M1 is selected from O, S, NAr m1 or CR m1 R m2 Any of the following: Q1, Q2, Q3, Q4, Ar m1 , R m1 , R m2 Having the same defined range as in formula b; The X 1 , X 2 , X 3 , X 5 , X 6 , X 7 , X 8 , Y 1 , Y 2 , Y 3 , Y 4 , Z 1 , Z 2 , Z 3 , Ar2 has the same defined range as in the formula (II); Preferably, the boron-containing luminescent dye has a structure as shown in any one of Formula (III-1), Formula (III-2), Formula (III-3), Formula (III-4), Formula (III-7), Formula (III-12), Formula (III-13), and Formula (III-14). Further preferably, the boron-containing luminescent dye has a structure as shown in any one of Formula (III-1), Formula (III-2), and Formula (III-3).

6. The light emitting device according to claim 5, characterized in that: The boron-containing luminescent dye comprises a structure as shown in at least one of formula (IV-1) to formula (IV-14): Among them, the dashed line represents a single bond or no connection; The X 1 , X 2 , X 3 , X 5 , X 6 , X 7 , X 8 、M1、Q1、Q2、Q3、Q4、Y 1 , Y 2 , Y 3 , Z 1 , Z 2 , Z 3 , Ar2 has the same definition as in claim 5; The Y 5 , Y 6 , Y 7 , Y 8 Each independently selected from CR A5 or N; R A5 any one selected from hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; any one of the two adjacent R A5 are not connected or connected to form a ring through chemical bonds; the R A5 Not connected to adjacent ring structures or connected to form a ring through chemical bonds; Preferably, the luminescent dye containing the boron element has a structure as shown in any one of formula (IV-1), formula (IV-2), formula (IV-3), formula (IV-4), formula (IV-7), formula (IV-12), formula (IV-13), and formula (IV-14); further preferably, the luminescent dye containing the boron element has a structure as shown in any one of formula (IV-1), formula (IV-2), and formula (IV-3).

7. The light emitting device according to claim 6, characterized in that: The X 5 , X 6 , X 7 , Y 2 , Y 3 , Y 5 , Y 6 , Y 7 , Y 8 , Y 9 , Z 1 , Z 2 , Z 3 At least one of them is CR X ; Preferably, the X 6 , X 7 , Y 2 , Y 3 , Y 6 , Y 8 , Y 9 , Z 2 At least one of them is CR X ; Preferably, the Y 2 , Y 3 , Y 6 , Y 8 , Y 9 and Z 2 At least one of them is CR X .

8. The light emitting device according to claim 6, characterized in that: The X 1 , X 2 , X 3 Each independently is CR A1 ; and / or, the X 5 , X 6 , X 7 , X 8 Each independently is CR A4 ; Preferably, the R A1 , R A4 Each is independently selected from hydrogen, fluorine, cyano, substituted or unsubstituted C1-C10 straight or branched alkyl, substituted or unsubstituted C5-C10 cycloalkyl, substituted or unsubstituted C1-C10 alkoxy, substituted or unsubstituted C3-C10 alkylsilyl, substituted or unsubstituted C2-C10 alkylamino, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6 -C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryloxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, further preferably hydrogen, cyano, substituted or unsubstituted C1-C5 straight or branched alkyl, substituted or unsubstituted C3-C10 alkylsilyl, substituted or unsubstituted C6-C20 arylamino, substituted or unsubstituted C6-C20 aryl, substituted or unsubstituted C3-C20 heteroaryl; Preferably, the X 1 , X 2 and X 3 are CH; and / or, the X 5 , X 6 , X 7 and X 8 All are CH; Preferably, Q1, Q2, Q3, and Q4 are each independently CR D1 ; Preferably, Q1, Q2, Q3 and Q4 are all CH; Preferably, the Y 1 , Y 2 , Y 3 Each independently is CR A2 ; Preferably, the Y 1 , Y 2 and Y 3 The number of CH in the medium is 1-3; Preferably, the Y 1 is CH, the Y 2 , Y 3 Each independently is CR A2 ; Preferably, the R A2 Each is independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, and substituted or unsubstituted C6-C30 aryloxy; Preferably, the Y 5 , Y 6 , Y 7 , Y 8 Each independently selected from CR A5 ; Preferably, the Y 5 , Y 6 , Y 7 , Y 8 The number of CH in the medium is 2-4; Preferably, when the dashed line in formula (IV-1) to formula (IV-9) and formula (IV-14) represents absence, the Y 6 , Y 8 One of them is CR A5 ; or, when the dotted line in formula (IV-1) to formula (IV-9) and formula (IV-14) represents a single bond, the Y 6 , Y 7 One of them is CR A5 ; Preferably, in any one of Formula (IV-10) to Formula (IV-13), the Y 6 , Y 8 , Y 9 One of them is CR A5 ; Preferably, the R A5 Each is independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl; Preferably, the Z 1 , Z 2 , Z 3 Each independently is CR A3 ; Preferably, the Z 1 , Z 2 and Z 3 The number of CH in the medium is 2-3; Preferably, the Z 1 and Z 3 for CH, the Z 2 CR A3 ; Preferably, the R A3 Each is independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, and substituted or unsubstituted C3-C60 heteroaryl.

9. The light emitting device according to claim 1, characterized in that: The boron-containing luminescent dye comprises a structure as shown in at least one of formula (V-1) to formula (V-7): Among them, the dashed line represents a single bond or no connection; M1 is selected from O, S, NAr m1 or CR m1 R m2 Any of the following: Ar m Any one selected from unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl; R m1 , R m2 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; the R m1 With R m2 They are not connected to each other or connected to form a ring through chemical bonds; R A2 , R A3 , R A5 Each independently represents no substitution, monosubstitution to the maximum allowed substitution; The R A2 , R A3 , R A5 each independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; said R A2 , R A3 , R A5 Each independently is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; The R A2 , R A3 and R A5 At least one of them is a group R X ; The R A2 Selected from hydrogen, R X , any one of substituted or unsubstituted C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C1-C10 alkylsilyl, substituted or unsubstituted C6-C20 arylamino, substituted or unsubstituted C6-C20 aryl, substituted or unsubstituted C3-C20 heteroaryl, substituted or unsubstituted C6-C20 aryloxy; Preferably, the R A3 Selected from hydrogen, R X , any one of a substituted or unsubstituted C1-C10 straight or branched alkyl group, and a substituted or unsubstituted C6-C20 aryl group; Preferably, the R A5 Selected from hydrogen, R X , any one of substituted or unsubstituted C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C1-C10 alkylsilyl, substituted or unsubstituted C6-C20 arylamino, substituted or unsubstituted C6-C20 aryl, and substituted or unsubstituted C3-C20 heteroaryl.

10. The light emitting device according to any one of claims 3 to 9, characterized in that: The R X It has the structure shown in formula c: Wherein, -* represents the attachment site of the group; R C1 Indicates no substitution, monosubstitution to the maximum allowed substitution; The L, R C1 Having the same limited range as in formula a; Preferably, the R C1 represents mono-substitution to the maximum allowed substitution; Preferably, the R C1 The number of substitutions is 1-9, more preferably 1-3; Preferably, the R C1 The attachment site is at least one of position 2, position 3, position 6, position 7, position 9 and position 10 in formula c, preferably position 9 or position 10; Preferably, the R X Having a structure as shown in formula d, or, said R X It has the structure shown in formula e: Among them, R 11 Any one selected from hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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; R 12 , R 13 Each independently represents no substitution, monosubstitution to the maximum allowed substitution; The R 12 , R 13 Each is independently selected from any one of hydrogen, unsubstituted or R'-substituted C1-C20 straight or branched alkyl, unsubstituted or R'-substituted C3-C20 cycloalkyl, unsubstituted or R'-substituted C1-C20 alkoxy, unsubstituted or R'-substituted C1-C20 alkylsilyl, unsubstituted or R'-substituted C6-C30 arylsilyl, unsubstituted or R'-substituted C1-C20 alkylamino, unsubstituted or R'-substituted C6-C30 arylamino, unsubstituted or R'-substituted C6-C30 aryloxy, unsubstituted or R'-substituted C6-C60 aryl, and unsubstituted or R'-substituted C3-C60 heteroaryl; R 14 Any one selected from hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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; Preferably, the R X The structure is Or, the R X The structure is Preferably, the R 11 Any one selected from hydrogen, unsubstituted or R'-substituted C1-C10 straight or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C3-C10 alkylsilyl, unsubstituted or R'-substituted C6-C20 aryloxy, unsubstituted or R'-substituted C6-C20 arylamino, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; further preferably any one selected from unsubstituted or R'-substituted C1-C5 straight or branched alkyl, unsubstituted or R'-substituted C3-C6 alkylsilyl, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; Preferably, the R 14 Any one selected from hydrogen, unsubstituted or R'-substituted C1-C10 straight or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C3-C10 alkylsilyl, unsubstituted or R'-substituted C6-C20 aryloxy, unsubstituted or R'-substituted C6-C20 arylamino, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; further preferably any one selected from unsubstituted or R'-substituted C1-C5 straight or branched alkyl, unsubstituted or R'-substituted C3-C6 alkylsilyl, unsubstituted or R'-substituted C6-C20 arylsilyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; Preferably, the R 11 Any one selected from the following groups: methyl, -* represents the attachment site of the group.

11. The light emitting device according to any one of claims 3 to 9, characterized in that: The L is selected from any one of the following groups: Wherein, -* represents the attachment site of the group; Y 11 , Y 12 , Y 13 , Y 14 , Y 15 , Y 16 , Y 17 , Y 18 , Y 19 Each independently selected from CR 21 or any one of N; M3 is selected from O, S, NAr m2 or CR m5 R m6 Any of the following: Ar m2 Any one selected from unsubstituted or R'-substituted C6-C60 aryl, unsubstituted or R'-substituted C3-C60 heteroaryl; R 21 , R m5 , R m6 Each is independently selected from any one of hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; the R 21 Each independently is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond; the R m5 With R m6 They are not connected to each other or connected to form a ring through chemical bonds; Preferably, L is selected from Any of the following: Preferably, L is selected from Any of the following: Preferably, the Y 11 , Y 12 , Y 13 , Y 14 , Y 15 , Y 16 Each independently is CR 21 ; Preferably, the R 21 Each is independently selected from any one of hydrogen, unsubstituted or R'-substituted C1-C10 straight or branched alkyl, unsubstituted or R'-substituted C3-C10 cycloalkyl, unsubstituted or R'-substituted C6-C20 aryl, and unsubstituted or R'-substituted C3-C20 heteroaryl; Preferably, L is selected from any one of the following groups: -* represents the attachment site of the group.

12. The light emitting device according to any one of claims 3 to 9, characterized in that: The boron-containing luminescent dye comprises a structure as shown in at least one of formulas M001-M832:

13. The light emitting device according to claim 1, characterized in that: The material of the light-emitting layer also includes a host material and / or a sensitizing material; Preferably, the singlet energy level and triplet energy level of the host material are both higher than the triplet energy level of the sensitizing material; Preferably, the sensitizing material comprises a phosphorescent material; Preferably, the host material comprises a first host material and a second host material, the first host material and the second host material form an exciplex, and the singlet energy level and triplet energy level of the exciplex are higher than the triplet energy level of the phosphorescent material; Preferably, the singlet and triplet energies of the exciplex are higher than the triplet energy level of the boron-containing luminescent dye.

14. The light emitting device according to claim 13, characterized in that: The main material includes a first main material and a second main material, the first main material is a hole transport type main material, the second main material is an electron transport type main material, and the singlet energy level S1 of the first main material P , the singlet energy level S1 of the second host material N , the singlet energy level S1 of the exciplex EX Satisfies the following relationship: S1 P >S1 N ≧S1 EX ; and / or, the singlet energy level S1 of the exciplex EX The triplet energy level T1 of the exciplex EX Satisfies the following relationship: 0<S1 EX -T1 EX ≤0.3eV; Preferably, the highest occupied orbital E of the hole transport host HOMO P and the lowest orbit E LUMO P , the highest occupied orbital E of the electron transport subject HOMO N and the lowest orbit E LUMO N Satisfaction: E HOMO P >E HOMO N , preferably, E HOMO P -E HOMO N >0.1eV; E LUMO P >E LUMO N , preferably, E LUMO P -E LUMO N >0.3eV; Preferably, the triplet energy level of the phosphorescent material is higher than the singlet energy level of the boron-containing luminescent dye, and / or, the triplet energy level of the phosphorescent material is higher than the triplet energy level of the boron-containing luminescent dye; preferably, the mass of the phosphorescent material accounts for 0.1-50% of the total mass of the luminescent layer, and the mass of the boron-containing luminescent dye accounts for 0.1-30% of the total mass of the luminescent layer; Preferably, the mass of the phosphorescent material accounts for 0.1-30% of the total mass of the light-emitting layer, and further preferably, the mass of the phosphorescent material accounts for 0.1-20% of the total mass of the light-emitting layer; Preferably, the mass of the boron-containing luminescent dye accounts for 0.1-10% of the total mass of the luminescent layer; Preferably, the mass of the boron-containing luminescent dye accounts for 0.1-5% of the total mass of the luminescent layer.

15. The light emitting device according to claim 13 or 14, characterized in that: The first host material comprises a structure as shown in Formula VI: Wherein, the Ar 1 One selected from substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl; R 001 and R 002 represents zero substitution to the maximum allowed substituent on the benzene ring, the R 001 and R 002 Each independently selected from one of 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, substituted or unsubstituted C3-C60 heteroaryl; Preferably, the first host material has a structure as shown in Formula VI-1 or Formula VI-2: Wherein, m and n are each independently an integer from 1 to 4; The Ar 2 ,Ar 3 ,Ar 4 Each independently selected from a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C3-C60 heteroaryl group; R 003 ~R 010 represents the substituents ranging from zero to the maximum allowed on the benzene ring, each independently selected from 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 aralkyl, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl; Preferably, the Ar 2 ,Ar 2 ,Ar 4 A combination of one or more 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 indolecarbazole, substituted or unsubstituted carbazole, and substituted or unsubstituted fluorene, each independently selected from the group consisting of substituted or unsubstituted benzene, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenylene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted indole, substituted or unsubstituted indolecarbazole, substituted or unsubstituted carbazole, and substituted or unsubstituted fluorene; Preferably, the first host material includes one or more of the following compounds D-1 to D-85: and / or, the second host material comprises a nitrogen-containing aromatic heterocyclic compound, Preferably, the second host material has a structure shown in Formula VII: Wherein, each of Q1 to Q5 is independently selected from nitrogen or CR 011 , R 011 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; the adjacent R 011 Connect or not connect; Preferably, the second host material comprises one or more of the following compounds A1 to A86:

16. The light emitting device according to claim 13 or 14, characterized in that: The phosphorescent material comprises a structure as shown in at least one of formulas GPD-1 to GPD-47: Where D is deuterium.

17. The light emitting device according to claim 1, characterized in that: At least one of the light-emitting layers includes a first light-emitting layer, and the light-emitting functional layer also includes a first hole injection layer, the first hole injection layer is located between the first light-emitting layer and the first electrode layer, the material of the first light-emitting layer includes a luminescent dye containing boron elements, and the singlet and triplet energy level difference of the luminescent dye containing boron elements is greater than or equal to 0.3 eV; Preferably, the light-emitting functional layer further comprises a first hole transport layer, which is located between the first light-emitting layer and the first hole injection layer; Preferably, the light-emitting functional layer further comprises a first electron blocking layer, which is located between the first light-emitting layer and the first hole transport layer; Preferably, the light-emitting functional layer further comprises a first hole blocking layer, which is located between the first light-emitting layer and the second electrode layer; Preferably, the light-emitting functional layer further comprises a first electron transport layer, which is located between the first hole blocking layer and the second electrode layer; Preferably, the light-emitting functional layer further comprises a first electron injection layer, which is located between the first electron transport layer and the second electrode layer; Preferably, between the first electron transport layer and the first electron injection layer, the light-emitting functional layer further includes at least one light-emitting functional unit; Preferably, the light-emitting functional unit comprises at least one of an n-type charge generation layer, a p-type charge generation layer, a second hole transport layer, a second electron blocking layer, a second light-emitting layer, a second hole blocking layer and a second electron transport layer, and the material of the second light-emitting layer comprises a luminescent dye containing a boron element, and the energy level difference between a singlet state and a triplet state of the luminescent dye containing a boron element is greater than or equal to 0.3 eV; Preferably, the n-type charge generation layer, the p-type charge generation layer, the second hole transport layer, the second electron blocking layer, the second light-emitting layer, the second hole blocking layer and the second electron transport layer are stacked in sequence, the n-type charge generation layer is located on a side of the p-type charge generation layer close to the first electron transport layer, and the second electron transport layer is located on a side of the second hole blocking layer close to the first electron injection layer; Preferably, the first light-emitting layer comprises a plurality of first sub-light-emitting layers, and the material of at least one layer of the first sub-light-emitting layer comprises a luminescent dye containing a boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing the boron element is greater than or equal to 0.3 eV; and / or, the second light-emitting layer comprises a plurality of second sub-light-emitting layers, and the material of at least one layer of the second sub-light-emitting layer comprises a luminescent dye containing a boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing the boron element is greater than or equal to 0.3 eV; Preferably, the light emitting device further comprises a light extraction layer located on a side of the second electrode layer away from the light emitting functional layer.

18. A light emitting device, characterized in that: include: A first electrode layer, a light-emitting functional layer, and a second electrode layer are sequentially stacked; The light-emitting functional layer comprises at least one light-emitting layer, and the material of the light-emitting layer comprises a luminescent dye containing boron element, a host material and a sensitizing material, and the half-peak width of the luminescent dye containing boron element is less than 45nm.

19. The light emitting device according to claim 18, characterized in that: The half-peak width of the luminescent dye containing the boron element is less than 35nm; Preferably, the energy level difference between the singlet and triplet states of the boron-containing luminescent dye is greater than or equal to 0.3 eV; Preferably, the boron-containing luminescent dye comprises a structure as shown in formula (I): Among them, X 1 , X 2 , X 3 , X 4 Each independently selected from CR A1 or N; Y 1 , Y 2 , Y 3 , Y 4 Each independently selected from CR A2 or N; Z 1 , Z 2 , Z 3 Each independently selected from CR A3 or N; R A1 , R A2 , R A3 Each is independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; Any two adjacent R A1 Any two adjacent R A2 Any two adjacent R A3 At least one group of them is connected by a chemical bond to form a ring F, wherein the ring F is selected from any one of a substituted or unsubstituted C6-C60 aromatic ring and a substituted or unsubstituted C3-C60 heteroaromatic ring; The R A1 , R A2 , R A3 In the above, the other groups except those forming the ring F are independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds; The Ar1 and Ar2 are each independently selected from unsubstituted or R B Substituted C6-C60 aryl, unsubstituted or R B Any one of substituted C3-C60 heteroaryl groups; Ar1 ​​and Ar2 are independently not connected to adjacent ring structures or are connected to form a ring through chemical bonds; The R B is selected from any one of halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkylamino, cyano, nitro, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 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; said R B Not connected to adjacent ring structures or connected to form a ring through chemical bonds; The R A1 , R A2 , R A3 、Ring F、R B The substituted substituents are each independently selected from halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano , nitro, 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; the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by chemical bonds; The R A1 , R A2 , R A3 At least one of the groups is R X , and / or, the R B At least one of them is a group R X ; The R X It has the structure shown in formula a: Wherein, -* represents the attachment site of the group; L is selected from any one of a substituted or unsubstituted C6-C60 arylene group and a substituted or unsubstituted C3-C60 heteroarylene group; X 11 , X 12 , X 13 , X 18 , X 19 , X 20 Each independently selected from C, CR C1 or N, one of which is C, and the C is connected to L; X 14 , X 15 , X 16 , X 17 Each independently selected from CR C1 or any one of N; R C1 Any one selected from hydrogen, halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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; The substituents substituted in L are each independently selected from any one of halogen, unsubstituted or R'substituted C1-C20 straight or branched alkyl, unsubstituted or R'substituted C3-C20 cycloalkyl, unsubstituted or R'substituted C2-C20 alkenyl, unsubstituted or R'substituted C1-C20 alkoxy, unsubstituted or R'substituted C1-C20 alkylsilyl, unsubstituted or R'substituted C6-C30 arylsilyl, unsubstituted or R'substituted C1-C20 alkylamino, cyano, nitro, 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, and unsubstituted or R'substituted C3-C60 heteroaryl; The R' is selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C60 aryl, and C3-C60 heteroaryl; adjacent R's are not connected or are connected to form a ring by chemical bonds; the R' is not connected to adjacent ring structures or is connected to form a ring by chemical bonds.

20. The light emitting device according to claim 18, characterized in that: At least one of the light-emitting layers includes a first light-emitting layer, and the light-emitting functional layer further includes a first hole injection layer, and the first hole injection layer is located between the first light-emitting layer and the first electrode layer; Preferably, the light-emitting functional layer further comprises a first hole transport layer, which is located between the first light-emitting layer and the first hole injection layer; Preferably, the light-emitting functional layer further comprises a first electron blocking layer, which is located between the first light-emitting layer and the first hole transport layer; Preferably, the light-emitting functional layer further comprises a first hole blocking layer, which is located between the first light-emitting layer and the second electrode layer; Preferably, the light-emitting functional layer further comprises a first electron transport layer, which is located between the first hole blocking layer and the second electrode layer; Preferably, the light-emitting functional layer further comprises a first electron injection layer, which is located between the first electron transport layer and the second electrode layer; Preferably, between the first electron transport layer and the first electron injection layer, the light-emitting functional layer further includes at least one light-emitting functional unit; Preferably, the light-emitting functional unit comprises at least one of an n-type charge generation layer, a p-type charge generation layer, a second hole transport layer, a second electron blocking layer, a second light-emitting layer, a second hole blocking layer and a second electron transport layer, and the material of the second light-emitting layer comprises a luminescent dye containing a boron element, and the energy level difference between a singlet state and a triplet state of the luminescent dye containing a boron element is greater than or equal to 0.3 eV; Preferably, the n-type charge generation layer, the p-type charge generation layer, the second hole transport layer, the second electron blocking layer, the second light-emitting layer, the second hole blocking layer and the second electron transport layer are stacked in sequence, the n-type charge generation layer is located on a side of the p-type charge generation layer close to the first electron transport layer, and the second electron transport layer is located on a side of the second hole blocking layer close to the first electron injection layer; Preferably, the first light-emitting layer comprises a plurality of first sub-light-emitting layers, and the material of at least one layer of the first sub-light-emitting layer comprises a luminescent dye containing a boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing the boron element is greater than or equal to 0.3 eV; and / or, the second light-emitting layer comprises a plurality of second sub-light-emitting layers, and the material of at least one layer of the second sub-light-emitting layer comprises a luminescent dye containing a boron element, and the energy level difference between the singlet state and the triplet state of the luminescent dye containing the boron element is greater than or equal to 0.3 eV; Preferably, the light emitting device further comprises a light extraction layer located on a side of the second electrode layer away from the light emitting functional layer.

21. A display panel, characterized in that: The display panel comprises the light emitting device according to any one of claims 1 to 20.

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