An OLED light-emitting compound and an organic electroluminescent device

Abstract

The application discloses an OLED light-emitting compound and an organic electroluminescent device, and a structural formula is shown as follows: wherein X and Y are independently a single bond, O, S or N-R1; CYCLO A and CYCLO B are independently a phenyl or naphthyl; R1 is a substituted or unsubstituted C6-C30 aryl; Ar1 is selected from a group of formula 2; Ar2 is selected from a group of formula 3; Z1, Z2 and Z3 are independently N or CH, and Z1, Z2 and Z3 are not simultaneously CH; o and p are independently 0, 1, 2, 3 or 4; and k is 0 or 1. The OLED light-emitting compound is applied to the organic electroluminescent device as a light-emitting layer material, the luminous efficiency of the organic electroluminescent device is greatly improved, the starting voltage is reduced, the power consumption is relatively reduced, the service life is greatly improved, and therefore the application has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of organic electroluminescence technology, specifically to an OLED luminescent compound and an organic electroluminescent device. Background Technology

[0002] Organic light emission (OLED) typically refers to the phenomenon of converting electrical energy into light energy using organic materials. OLED devices generally have a structure comprising an anode and a cathode, with an organic layer between them. To improve the efficiency and stability of OLEDs, the organic layer is often formed by a multilayer structure composed of different materials; for example, it can consist of a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer. In such an OLED structure, if a voltage is applied between the two electrodes, holes are injected from the anode into the organic layer, and electrons are injected from the cathode. When the injected holes and electrons meet, excitons are formed, and when these excitons re-enter the ground state, they emit light.

[0003] In terms of the actual needs of the current organic electroluminescent industry, the development of organic electroluminescent materials is still far from sufficient. The market for organic electroluminescent devices is huge. Therefore, stable and efficient organic electroluminescent materials play an important role in the application and promotion of organic electroluminescent devices, and are also an urgent need for the application and promotion of large-area organic electroluminescent panel displays.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] Purpose of the invention: To address the above-mentioned technical problems, the present invention provides an OLED luminescent compound and an organic electroluminescent device.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] An OLED luminescent compound has the following structural formula as shown in Formula 1:

[0008]

[0009] Among them, X and Y are independently single bonds, O, S, and N-R1;

[0010] CYCLO A and CYCLO B are independently phenyl and naphthyl groups, respectively;

[0011] R1 is a substituted or unsubstituted C6-C30 aryl group;

[0012] Ar1 is selected from group 2 of formula:

[0013]

[0014] Ar2 is selected from group 3 of formula:

[0015]

[0016] Z1, Z2, and Z3 are each independently either N or CH, and Z1, Z2, and Z3 are not simultaneously CH;

[0017] o and p are independently 0, 1, 2, 3, and 4;

[0018] k is 0 or 1; when k is 0, Ar1 is directly connected to CYCLO A.

[0019] Furthermore, its structural formula can be any of the following:

[0020]

[0021] Furthermore, X and Y are not both single bonds, and when one of X and Y is O, the other is not S.

[0022] Furthermore, R1 is any one of hydrogen, phenyl, biphenyl, terphenyl, naphthyl, anthraceneyl, and phenanthrene;

[0023] The phenyl, biphenyl, terphenyl, naphthyl, anthracene, and phenanthrene groups are unsubstituted or are groups obtained by substituting at least one hydrogen atom with deuterium, cyano, fluorine, C1-C4 alkyl, or C1-C4 deuterated alkyl.

[0024] Furthermore, R1 is phenyl.

[0025] Furthermore, Ar1 is selected from the following groups:

[0026]

[0027] Furthermore, Ar2 is selected from the following groups:

[0028]

[0029] Furthermore, it is any one of the following compounds:

[0030]

[0031]

[0032]

[0033] An organic electroluminescent device includes a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, wherein the organic layer contains the aforementioned OLED light-emitting compound.

[0034] Furthermore, the organic layer includes a light-emitting layer containing the aforementioned OLED light-emitting compound.

[0035] Furthermore, the light-emitting layer also contains any one or more combinations of the following compounds G1-G28:

[0036] The room temperature described in this invention is 25±5℃.

[0037] The beneficial effects of this invention are:

[0038] This invention designs an OLED luminescent compound and an organic electroluminescent device. The compound's molecular structure comprises an electron-withdrawing diphenyl-substituted azaphenyl structure and an electron-donating carbazole or phenyl-substituted carbazole structure, which are connected by a fused heterocyclic structure to form a D-π-A structure. This structure simultaneously possesses the ability to transport electrons and holes, achieving a better balance between electron and hole transport and exhibiting excellent photoelectric performance. Furthermore, the D-π-A structure design maintains a certain rotation angle in the material's molecular structure, increasing the compound's torque and steric hindrance, reducing its crystallinity, and giving the compound better thermal stability and film-forming properties. This, in turn, increases the lifetime and luminous efficiency of devices fabricated using this type of compound. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the organic electroluminescent device provided by the present invention;

[0040] The labels in the diagram represent:

[0041] 1-Anode, 2-Hole injection layer, 3-Hole transport layer, 4-Electron blocking layer, 5-Light emitting layer, 6-Hole blocking layer, 7-Electron transport layer, 8-Electron injection layer, 9-Cathode.

[0042] Figure 2 This is an HPLC chromatogram of the OLED luminescent compound 1 prepared in Example 1 of the present invention;

[0043] Figure 3 The 1H NMR spectrum of the OLED luminescent compound 1 prepared in Example 1 of this invention;

[0044] Figure 4 The DSC spectrum of the OLED luminescent compound 1 prepared in Example 1 of this invention is shown below. Figure 4It is known that the Tm of OLED luminescent compound 1 is 325.30℃.

[0045] Figure 5 The TGA spectrum of the OLED luminescent compound 1 prepared in Example 1 of this invention is shown below. Figure 5 It can be seen that the Td of OLED luminescent compound 1 is 469.83℃.

[0046] Figure 6 The lifetime diagrams are shown for the organic electroluminescent devices in Application Example 1 and Comparative Example 1 of the present invention.

[0047] Depend on Figure 6 It can be seen that the T97% lifetimes of the organic electroluminescent devices prepared in Application Example 1 and Comparative Example 1 of the present invention are 424h and 355h, respectively. Detailed Implementation

[0048] Embodiments of various aspects are further illustrated and described below. It should be understood that the description herein is not intended to limit the claims to the specific aspects described. Rather, it is intended to cover substitutions, modifications, and equivalents that may be included within the spirit and scope of this disclosure as defined by the appended claims.

[0049] As used herein, “Ca to Cb” hydrocarbon groups are defined as hydrocarbon groups having a carbon number of “a” (inclusive) to “b” (inclusive). As used herein, “a and / or b” means “a” or “b” or “a and b”.

[0050] As used herein, in the context of “substituted” or “unsubstituted”, the term “substituted” means that at least one hydrogen in the group is recoordinated with a deuterium, alkyl group, hydrocarbon derivative group, halogen, or cyano (-CN). The term “unsubstituted” means that at least one hydrogen in the group is not recoordinated with a deuterium, alkyl group, hydrocarbon derivative group, halogen, or cyano (-CN). Examples of alkyl or hydrocarbon derivative groups may include, but are not limited to, C1 to C30 alkyl, C2 to C30 alkenyl, C2 to C30 alkynyl, C6 to C30 aryl, C5 to C30 heteroaryl, C1 to C30 alkylamino, C6 to C30 aromaticamino, C6 to C30 heteroarylamino, C6 to C30 aryl heteroarylamino, etc.

[0051] Unless otherwise specified in the examples, the procedures should be performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0052] Example 1:

[0053]

[0054] The synthesis method of OLED luminescent compound 1 is as follows:

[0055]

[0056] S1: Under nitrogen protection, compound 1-a (10 g, 449.08 g / mol, 22.27 mmol), compound 1-b (1.1 eq, 4.1 g, 167.21 g / mol, 24.5 mmol), sodium tert-butoxide (1.1 eq, 2.35 g, 96.1 g / mol, 24.5 mmol), tris(dibenzylacetone)dipalladium (0.05 eq, 1.02 g, 915 g / mol, 1.11 mmol), tri-tert-butylphosphine (0.05 eq, 0.22 g, 202.32 g / mol, 1.11 mmol), and toluene (200 ml) were added to a reaction flask. After the addition was complete, the mixture was heated to reflux for 5 h. After the reaction was completed and cooled to room temperature, water (200 ml) was added and stirred for 15 min. The mixture was then filtered to obtain a filtrate. The filtrate was filtered through diatomaceous earth and separated to obtain a toluene phase. The toluene phase was dried over anhydrous magnesium sulfate and then evaporated to dryness. After purification by column chromatography, compound 1-c (7.95 g, yield 73.1%) was obtained. ESI-MS (m / z) (M+): theoretical value 488.37, measured value 488.55. Elemental analysis results (molecular formula C30H18BrNO): theoretical value C, 73.78; H, 3.71; Br, 16.36; N, 2.87; O, 3.28; measured value C, 73.78; H, 3.70; Br, 16.36; N, 2.87; O, 3.28.

[0057] S2: Under nitrogen protection, compound 1-c (7 g, 488.37 g / mol, 14.33 mmol), compound 1-d (1.1 eq, 4.37 g, 277.09 g / mol, 15.76 mmol), and sodium carbonate (2 eq, 3.04 g, 105.99 g / mol, 28.66 mmol) were added to toluene (140 ml), ethanol (70 ml), and water (70 ml). After stirring and mixing, tetrakis(triphenylphosphine)palladium (0.05 eq, 0.83 g, 1155.58 g / mol, 0.72 mmol) was added, and the mixture was heated to reflux. After 10 hours, the mixture was cooled to room temperature and 70 ml of water was added. The aqueous phase was separated by stirring. The aqueous phase was extracted with dichloromethane, and the organic phases were combined and dried with anhydrous sodium sulfate. The organic phases were then purified by silica gel column chromatography to obtain OLED luminescent compound 1 (7.4 g, yield 80.6%). ESI-MS (m / z) (M+): theoretical value 640.73, measured value 640.75. Elemental analysis results (molecular formula C45H28N4O): theoretical value C, 84.35; H, 4.40; N, 8.74; O, 2.50; measured value C, 84.35; H, 4.40; N, 8.74; O, 2.50.

[0058] The HPLC chromatogram data of the OLED luminescent compound 1 prepared in Example 1 are shown in Table 1 below:

[0059] Table 1:

[0060]

[0061] Example 2:

[0062]

[0063] The synthesis method of OLED luminescent compound 4 is as follows:

[0064]

[0065] The synthesis method was basically the same as in Example 1, except that compounds 1-a, 1-b, and 1-d were replaced with compounds 3-a, 3-b, and 3-d, respectively, to synthesize OLED luminescent compound 4 (yield 78.2%). ESI-MS (m / z) (M+): theoretical value 715.84, measured value 715.64. Elemental analysis results (molecular formula C52H33N3O): theoretical value C, 87.25; H, 4.65; N, 5.87; O, 2.24; measured value C, 87.25; H, 4.65; N, 5.87; O, 2.25.

[0066] Example 3:

[0067]

[0068] The synthesis method of OLED luminescent compound 7 is as follows:

[0069]

[0070] The synthesis method was basically the same as in Example 1, except that compound 1-a was replaced with compound 3-a to synthesize OLED luminescent compound 7 (yield 78.6%). ESI-MS (m / z) (M+): theoretical value 640.73, measured value 640.81. Elemental analysis results (molecular formula C45H28N4O): theoretical value C, 84.35; H, 4.40; N, 8.74; O, 2.50; measured value C, 84.35; H, 4.40; N, 8.75; O, 2.50.

[0071] Example 4:

[0072]

[0073] The synthesis method of OLED luminescent compound 8 is as follows:

[0074]

[0075] The synthesis method was basically the same as in Example 1, except that compound 1-a was replaced with compound 4-a to synthesize OLED luminescent compound 8 (yield 75.3%). ESI-MS (m / z) (M+): theoretical value 640.73, measured value 640.26. Elemental analysis results (molecular formula C45H28N4O): theoretical value C, 84.35; H, 4.40; N, 8.74; O, 2.50; measured value C, 84.35; H, 4.40; N, 8.74; O, 2.50.

[0076] Example 5:

[0077]

[0078] The synthesis method of OLED luminescent compound 10 is as follows:

[0079]

[0080] The synthesis method was basically the same as in Example 1, except that compound 1-b was replaced with compound 5-b to synthesize OLED luminescent compound 10 (yield 78.8%). ESI-MS (m / z) (M+): 640.73, measured value 640.65. Elemental analysis results (molecular formula C45H28N4O): theoretical value C, 84.35; H, 4.40; N, 8.74; O, 2.50; measured value C, 84.35; H, 4.41; N, 8.74; O, 2.50.

[0081] Example 6:

[0082]

[0083] The synthesis method of OLED luminescent compound 12 is as follows:

[0084]

[0085] The synthesis method was basically the same as in Example 1, except that compound 1-a was replaced with compound 6-a to synthesize OLED luminescent compound 12 (yield 75.3%). ESI-MS (m / z) (M+): 640.73, measured value 640.49. Elemental analysis results (molecular formula C45H28N4O): theoretical values ​​C, 84.35; H, 4.40; N, 8.74; O, 2.50; measured values ​​C, 84.35; H, 4.40; N, 8.74; O, 2.50.

[0086] Example 7:

[0087]

[0088] The synthesis method of OLED luminescent compound 15 is as follows:

[0089]

[0090] The synthesis method was basically the same as in Example 6, except that compound 6-d was replaced with compound 7-d to synthesize OLED luminescent compound 12 (yield 74.9%). ESI-MS (m / z) (M+): 638.75, measured value 638.93. Elemental analysis results (molecular formula C47H30N2O): theoretical values ​​C, 88.38; H, 4.73; N, 4.39; O, 2.50; measured values ​​C, 88.38; H, 4.73; N, 4.40; O, 2.50.

[0091] Example 8:

[0092]

[0093] The synthesis method of OLED luminescent compound 25 is as follows:

[0094]

[0095] The synthesis method was basically the same as in Example 5, except that compound 5-a was replaced with compound 8-a to synthesize OLED luminescent compound 25 (yield 73.3%). ESI-MS (m / z) (M+): 766.88, measured value 766.92. Elemental analysis results (molecular formula C55H34N4O): theoretical values ​​C, 86.14; H, 4.47; N, 7.31; O, 2.09; measured values ​​C, 86.14; H, 4.47; N, 7.31; O, 2.10.

[0096] Example 9:

[0097]

[0098] The synthesis method of OLED luminescent compound 40 is as follows:

[0099]

[0100] The synthesis method was basically the same as in Example 1, except that compounds 1-a and 1-b were replaced with compounds 9-a and 9-b to synthesize OLED luminescent compound 40 (yield 71.8%). ESI-MS (m / z) (M+): 732.83, measured value 732.40. Elemental analysis results (molecular formula C51H32N4O2): theoretical values ​​C, 83.59; H, 4.40; N, 7.65; O, 4.37; measured values ​​C, 83.59; H, 4.40; N, 7.65; O, 4.37.

[0101] Example 10:

[0102]

[0103] The synthesis method of OLED luminescent compound 51 is as follows:

[0104]

[0105] The synthesis method was basically the same as in Example 5, except that compound 5-a was replaced with compound 10-a to synthesize OLED luminescent compound 51 (yield 73.0%). ESI-MS (m / z) (M+): 782.88, measured value 782.69. Elemental analysis results (molecular formula C55H34N4O2): theoretical values ​​C, 84.38; H, 4.38; N, 7.16; O, 4.09; measured values ​​C, 84.38; H, 4.38; N, 7.16; O, 4.09.

[0106] Example 11:

[0107]

[0108] The synthesis method of OLED luminescent compound 59 is as follows:

[0109]

[0110] The synthesis method was basically the same as in Example 1, except that compound 1-a was replaced with compound 11-a. OLED luminescent compound 59 was synthesized (yield 74.2%). ESI-MS (m / z) (M+): 738.92, measured value 738.75. Elemental analysis results (molecular formula C49H30N4S2): theoretical values ​​C, 79.65; H, 4.09; N, 7.58; S, 8.68; measured values ​​C, 79.66; H, 4.09; N, 7.58; S, 8.68.

[0111] Example 12:

[0112]

[0113] The synthesis method of OLED luminescent compound 72 is as follows:

[0114]

[0115] The synthesis method was basically the same as in Example 1, except that compounds 1-a and 1-d were replaced with compounds 12-a and 12-d to synthesize OLED luminescent compound 72 (yield 78.6%). ESI-MS (m / z) (M+): 655.81, measured value 655.63. Elemental analysis results (molecular formula C46H29N3S): theoretical values ​​C, 84.25; H, 4.46; N, 6.41; S, 4.89; measured values ​​C, 84.25; H, 4.46; N, 6.41; S, 4.90.

[0116] Example 13:

[0117]

[0118] The synthesis method of OLED luminescent compound 79 is as follows:

[0119]

[0120] The synthesis method was basically the same as in Example 3, except that compound 3-b was replaced with compound 13-b to synthesize OLED luminescent compound 79 (yield 71.7%). ESI-MS (m / z) (M+): 716.83, measured value 716.80. Elemental analysis results (molecular formula C51H32N4O): theoretical values ​​C, 85.45; H, 4.50; N, 7.82; O, 2.23; measured values ​​C, 85.45; H, 4.50; N, 7.82; O, 2.23.

[0121] Example 14:

[0122]

[0123] The synthesis method of OLED luminescent compound 80 is as follows:

[0124]

[0125] The synthesis method was basically the same as in Example 9, except that compound 9-a was replaced with compound 14-a to synthesize OLED luminescent compound 80 (yield 72.2%). ESI-MS (m / z) (M+): 716.83, measured value 716.66. Elemental analysis results (molecular formula C51H32N4O): theoretical values ​​C, 85.45; H, 4.50; N, 7.82; O, 2.23; measured values ​​C, 85.45; H, 4.50; N, 7.81; O, 2.23.

[0126] Example 15:

[0127]

[0128] The synthesis method of OLED luminescent compound 87 is as follows:

[0129]

[0130] The synthesis method was basically the same as in Example 12, except that compound 12-a was replaced with compound 15-a to synthesize OLED luminescent compound 87 (yield 75.6%). ESI-MS (m / z) (M+): 755.92, measured value 755.74. Elemental analysis results (molecular formula C54H33N3S): theoretical values ​​C, 85.80; H, 4.40; N, 5.56; S, 4.24; measured values ​​C, 85.80; H, 4.40; N, 5.56; S, 4.24.

[0131] Example 16:

[0132]

[0133] The synthesis method of OLED luminescent compound 91 is as follows:

[0134]

[0135] The synthesis method was basically the same as in Example 12, except that compound 12-a was replaced with compound 16-a to synthesize OLED luminescent compound 91 (yield 74.1%). ESI-MS (m / z) (M+): 705.87, measured value 705.62. Elemental analysis results (molecular formula C50H31N3S): theoretical value C, 85.08; H, 4.43; N, 5.95; S, 4.54; measured value C, 85.08; H, 4.43; N, 5.95; S, 4.54.

[0136] Material property testing:

[0137] The glass transition temperature Tg and thermogravimetric temperature Td of OLED luminescent compounds 1, 4, 7, 8, 10, 12, 15, 25, 40, 51, 59, 72, 79, 80, 87, and 91 in Examples 1-16 of this invention were tested, and the results are shown in Table 2.

[0138] Note: The thermogravimetric temperature Td is the temperature at which 5% weight is lost in a nitrogen atmosphere, and it is measured on a TGA N-1000 thermogravimetric analyzer with a nitrogen flow rate of 10 mL / min. The glass transition temperature Tg is measured by differential scanning calorimetry (DSC, Netzsch DSC204F1 differential scanning calorimeter, Germany) at a heating rate of 10 °C / min.

[0139] Table 2:

[0140] 1 138.94 469.83 4 140.53 471.99 7 138.66 465.17 8 141.01 472.14 10 140.22 470.55 12 140.77 478.26 15 135.94 463.32 25 140.79 470.20 40 143.01 472.16 51 138.07 476.84 59 141.52 472.53 72 136.98 470.11 79 138.44 474.27 80 142.45 468.33 87 141.37 471.18 91 146.81 470.45

[0141] As shown in Table 2 above, the OLED luminescent compound of the present invention has high Tg and Td values, indicating that it has excellent thermal stability. When used as an organic electroluminescent material in organic electroluminescent devices, it can effectively extend the service life of organic electroluminescent devices and achieve better performance.

[0142] Device performance testing:

[0143] Application Example 1:

[0144] ITO was used as the anode substrate material for the reflective layer, and its surface was treated sequentially with water, acetone, and N2 ions.

[0145] A hole injection layer (HIL) with a thickness of 10 nm is deposited on top of the ITO anode substrate.

[0146] A hole transport layer (HTL) with a thickness of 100 nm is formed by evaporating NPD on top of the hole injection layer (HIL);

[0147] EB-1 was vacuum-deposited above the hole transport layer (HTL) to form an electron blocking layer (EBL) with a thickness of 10 nm;

[0148] The OLED luminescent compound 1 prepared in Example 1 of the present invention was mixed with G1 at a mass ratio of 6:4 to form the main luminescent material. GD-1, as a green light dopant (the amount of GD-1 is 6% of the weight of the main luminescent material), was evaporated at different rates on the electron blocking layer (EBL) to form a luminescent layer with a thickness of 10 nm.

[0149] HB-1 was deposited onto the light-emitting layer to obtain a hole blocking layer (HBL) with a thickness of 20 nm;

[0150] ET-1 was deposited as an electron transport layer material (ET) onto a hole blocking layer (HBL) to obtain an electron transport layer (ETL) with a thickness of 30 nm. An electron injection layer (EIL) with a thickness of 2 nm was deposited on top of the electron transport layer (ETL).

[0151] Subsequently, magnesium (Mg) and silver (Ag) were mixed in a 9:1 ratio and vapor-deposited to obtain a cathode with a thickness of 15 nm. A 50 nm thick DNTPD was then deposited on the cathode sealing layer. In addition, the cathode surface was sealed with a UV-curable adhesive and a sealing cap containing a desiccant to protect the organic electroluminescent device from the influence of atmospheric oxygen or moisture. Thus, an organic electroluminescent device was prepared.

[0152]

[0153]

[0154] Application Example 2-16

[0155] The OLED luminescent compound 1 in Application Example 1 was replaced with OLED luminescent compounds 4, 7, 8, 10, 12, 15, 25, 40, 51, 59, 72, 79, 80, 87, and 91 from Examples 2-16 of the present invention, while the other parts were the same as in Application Example 1. Based on this, the organic electroluminescent devices of Application Examples 2-16 were fabricated.

[0156] Compare with Examples 1 and 2

[0157] The difference between Comparative Examples 1 and 2 and Application Example 1 is that GH-1 and GH-2 are used respectively to replace OLED luminescent compound 1 in Application Example 1, while the rest are the same as Application Example 1.

[0158] The organic electroluminescent devices prepared in Application Examples 1-23 and the control examples were tested respectively, and the test results are shown in Table 3.

[0159] Table 3:

[0160]

[0161]

[0162] As shown in Table 3 above, when the OLED luminescent compound of the present invention is used as a light-emitting layer material in organic electroluminescent devices, the luminous efficiency of the organic electroluminescent devices is significantly improved, and the start-up voltage is reduced, resulting in a relative decrease in power consumption.

[0163] The organic electroluminescent devices prepared in Comparative Examples 1 and 2 and Application Examples 1-5 were subjected to luminescence lifetime testing to obtain the luminescence lifetime T97% data (the time for the luminous brightness to decrease to 97% of the initial brightness). The testing equipment was a TEO luminescent device lifetime testing system. The results are shown in Table 4:

[0164] Table 4:

[0165]

[0166] As shown in Table 4 above, when the OLED luminescent compound of the present invention is used as the luminescent layer material in organic electroluminescent devices, the lifespan of the prepared organic electroluminescent devices is greatly improved, so it has a very broad application prospect.

Claims

1. An OLED luminescent compound, characterized in that, Its structural formula is shown below:

2. An organic electroluminescent device, characterized in that, It includes a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, wherein the organic layer contains the OLED luminescent compound as described in claim 1.

3. The organic electroluminescent device according to claim 2, characterized in that, The organic layer includes a light-emitting layer, which contains the OLED light-emitting compound as described in claim 1.

4. The organic electroluminescent device according to claim 3, characterized in that, The light-emitting layer also contains any one or more combinations of the following compounds G1-G28:

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