Composition for organic light-emitting device and organic light-emitting device
By using a combination of ternary P-type and N-type compound materials in organic light-emitting devices, the problem of carrier imbalance was solved, the luminous efficiency and lifetime were improved, and the stability of the thin film morphology was ensured.
Patent Information
- Application Number
- CN202511398235.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-01-09
AI Technical Summary
In existing organic light-emitting devices, carrier imbalance leads to increased leakage current, which reduces luminous efficiency and lifetime. The combination of dual host materials in green light devices has limitations.
A ternary system consisting of a dual P-type compound material and a single N-type compound material was used as the host material for the luminescent layer to optimize carrier injection and mobility.
This improved the luminous efficiency and lifetime of the device, and ensured the stability of the thin film morphology and the device performance.
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Figure CN121293210A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of organic electroluminescence technology, specifically relating to a composition for organic light-emitting devices and an organic light-emitting device. Background Technology
[0002] OLED (Organic Light-Emitting Diode) is a current-driven organic light-emitting device. When it is working, under the influence of an electric field, holes generated at the anode and electrons generated at the cathode move and are injected into the hole transport layer and electron transport layer, respectively. When the two meet in the light-emitting layer, they generate energy excitons, which in turn excite the light-emitting molecules to produce visible light.
[0003] In organic light-emitting devices (OLEDs), if one type of charge carrier (holes or electrons) significantly outnumbers the other, the excess carriers cannot form excitons and will flow directly through the device, creating leakage current. This reduces the probability of exciton generation and consequently decreases the device's luminous efficiency. To address this, the mainstream strategy in current technology is to use a dual-host system composed of P-type and N-type compound materials in the emitting layer. This dual-host system effectively improves luminous efficiency and extends device lifespan by balancing charge carriers. However, in practical applications of green dual-host material devices, we have found that although dual-host materials offer a more balanced injection and transport of holes and electrons compared to single-host materials, limitations still exist in their compatibility. Summary of the Invention
[0004] The technical objective of this invention is to provide a composition and an organic light-emitting device for use in organic light-emitting devices, which employ a ternary system composed of a dual P-type compound material and a single N-type compound material as the main material of the light-emitting layer, in order to further improve the device performance.
[0005] To achieve the above-mentioned technical objectives, the technical solution provided by the present invention includes:
[0006] In a first aspect, the present invention provides a composition for an organic light-emitting device, characterized in that it comprises a first compound represented by Formula 1, a second compound represented by Formula 2, and a third compound represented by Formula 3:
[0007] [Formula 1]
[0008]
[0009] [Equation 2]
[0010]
[0011] In Equations 1 and 2:
[0012] Ar1, Ar2, Ar3, and Ar4 each independently represent a substituted or unsubstituted C6-C18 aryl group or a substituted or unsubstituted C12-C18 heteroaryl group; the substituents of the C6-C18 aryl group and the C12-C18 heteroaryl group are each independently selected from one or more of deuterium, phenyl, and deuterated phenyl.
[0013] R1-R 24 Each element is independently selected from either hydrogen or deuterium;
[0014] [Formula 3]
[0015]
[0016] In Equation 3:
[0017] One of Ar5 and Ar6 represents a substituted or unsubstituted C6-C12 aryl group, and the other represents a substituted or unsubstituted C12-C18 heteroaryl group; the substituents of the C6-C12 aryl group and the C12-C18 heteroaryl group are each independently selected from one or more of deuterium, phenyl and deuterated phenyl groups;
[0018] L1 represents a direct bond, a C6-C12 aryl group that is either deuterated or unsubstituted;
[0019] R 25 -R 32 Each of the following is independent: hydrogen, deuterium, phenyl, or deuterated phenyl, R 25 -R 32 At least seven of the R groups are hydrogen or deuterium.
[0020] In a more preferred embodiment:
[0021] Furthermore, the heteroaryl groups in Formula 1 and Formula 2 are selected from heteroaryl groups containing O or N atoms; the heteroaryl group in Formula 3 is selected from heteroaryl groups containing O atoms.
[0022] Furthermore, the third compound is selected from compounds represented by formula 3-1:
[0023] [Equation 3-1]
[0024]
[0025] Where m is an integer selected from 0 to 3, t is an integer selected from 0 to 4, and R 33 and R 34 Each occurrence is identical or different and selected from deuterium, phenyl, or deuterated phenyl, and there is one and only one R. 33 Or R 34 It is either phenyl or deuterated phenyl.
[0026] Furthermore, the third compound is selected from compounds represented by formula 3-2:
[0027] [Equation 3-2]
[0028]
[0029] in:
[0030] m is an integer selected from 0 to 3, t is an integer selected from 0 to 4, and n is an integer selected from 0 to 4;
[0031] R 33 R 34 and R 35 Each occurrence, whether identical or different, is selected from deuterium, phenyl, or deuterated phenyl, and R 33 and R 34 Only one of them is phenyl or deuterated phenyl.
[0032] Furthermore, in Equations 1 and 2:
[0033] Ar1, Ar2, Ar3, and Ar4 are each independently selected from substituted or unsubstituted phenyl, biphenyl, dibenzofuran, or carbazole.
[0034] Furthermore, in Equation 1, R1-R 10 All are hydrogen or all are deuterium; in Equation 2, R 11 -R 24 All are hydrogen or all are deuterium; in Equation 3, R 25 -R 32 At least seven of the R groups are either hydrogen or deuterium.
[0035] Furthermore, the first compound is selected from any one of the following compounds:
[0036]
[0037]
[0038]
[0039] Furthermore, the second compound is selected from any one of the following compounds:
[0040]
[0041]
[0042]
[0043] Furthermore, the third compound is selected from any one of the following compounds:
[0044]
[0045]
[0046]
[0047]
[0048]
[0049]
[0050] In a second aspect, the present invention provides an organic light-emitting device comprising a cathode, an anode, and a light-emitting layer formed therebetween, characterized in that the light-emitting layer comprises a composition as described in any of the preceding claims.
[0051] The beneficial effects of this invention are as follows:
[0052] 1) Based on the existing dual-substrate material system of the light-emitting layer, this invention improves the combination of the main materials of the light-emitting layer and optimizes the synergy between P-type and N-type materials, which can further improve the injection and mobility of charge carriers, thereby improving the luminous efficiency and luminous lifetime of the device.
[0053] 2) In the three-body material system of the present invention, the two P-type materials have good compatibility with each other and with the N-type materials, thereby ensuring that even with an increase in the types of body materials, the vapor deposition process can still form a good thin film morphology, thus ensuring the stability of device performance. Attached Figure Description
[0054] Figure 1 This is a schematic diagram of the structure of the organic light-emitting device of the present invention;
[0055] Figure 2 This is the HPLC chromatogram of compound P16;
[0056] Figure 3 This is the HPLC chromatogram of compound P25;
[0057] Figure 4 This is the HPLC chromatogram of compound N59;
[0058] Figure 5 This is the HPLC chromatogram of compound N4;
[0059] Figure 6 This is the TGA image of compound P16;
[0060] Figure 7 This is the TGA image of compound P25;
[0061] Figure 8 This is the TGA image of compound N59;
[0062] Figure 9 This is the TGA image of compound N4;
[0063] Figure 10 This is the DSC chromatogram of compound P16;
[0064] Figure 11 This is the DSC chromatogram of compound P25;
[0065] Figure 12 This is the DSC chromatogram of compound N59;
[0066] Figure 13 This is the DSC diagram of compound N4.
[0067] Figure 1 The reference numerals in the figures represent: 1-anode, 2-hole injection layer, 3-first hole transport layer, 4-second hole transport layer, 5-light emission layer, 6-hole blocking layer, 7-electron transport layer, 8-electron injection layer, and 9-cathode. Detailed Implementation
[0068] Embodiments of various aspects of the invention are further described and illustrated below. It should be understood that the following description 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 scope defined by the appended claims.
[0069] As used herein, the term "substitution" refers to the recoordination of at least one hydrogen atom of a group with other substituent groups. In this invention, "deuterium" refers to a stable isotope of hydrogen (H), also known as heavy hydrogen; in specific compounds, D represents deuterium.
[0070] To verify the technical effectiveness of this invention, the following description will be provided in conjunction with device testing examples. Unless otherwise specified, all conditions in these examples are performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products.
[0071] Regarding the preparation of the main material compounds used for device testing, the synthesis methods are described below using some compounds as examples. Other related compounds can be prepared by referring to similar methods.
[0072] Synthesis example 1:
[0073]
[0074] 1.1. Synthesis Scheme
[0075]
[0076] 1.2. Synthesis Process
[0077] Under nitrogen protection, a carbazole compound (45 g, 0.11 mol, 1 eq) and a halogenated compound (30 g, 0.129 mol, 1.17 eq) were added to a reaction flask, followed by 500 ml of toluene, sodium tert-butoxide (21 g, 0.2184 mol, 2 eq), palladium acetate (0.7 g, 0.003 mol, 2.5% eq), and X-phos (2.1 g, 0.0044 mol, 4%). After the addition was complete, the reaction solution was refluxed for 12 h. After the reaction solution cooled to room temperature, 200 ml of water was added, and the mixture was stirred for 30 min. The mixture was then filtered, and the filter cake was purified by column chromatography to obtain approximately 30 g of product P16, with a yield of 50%.
[0078] Synthesis example 2:
[0079]
[0080] 2.1. Synthesis Scheme
[0081]
[0082] 2.2. Synthesis Process
[0083] Step 1: Under nitrogen protection, indole-carbazole raw material (36.5 g, 0.11 mol), 4-bromobiphenyl (25.5 g, 0.11 mol), toluene (500 ml), sodium tert-butoxide (21.5 g, 0.22 mol), palladium acetate (0.5 g, 2.6 mmol), and X-phos (2 g, 4.4 mol) were added to the reaction flask. After the addition was complete, the reaction solution was heated to reflux for 6 h. After cooling, 200 ml of water was added for washing, and the mixture was filtered. The filter cake was dried and purified by column chromatography using a petroleum ether / dichloromethane system to obtain approximately 42.6 g of compound 1, with a yield of 80%.
[0084] Step 2: Under nitrogen protection, compound 1 (42.6 g, 0.084 mol) and deuterated benzene (141 g, 1.68 mol) were added to the reaction flask, followed by trifluoromethanesulfonic acid (63 g, 0.42 mol). After the addition was complete, the mixture was heated to 50 °C and stirred for 12 h. After cooling, a heavy aqueous solution of sodium carbonate was added to quench the reaction. The mixture was then filtered, and the filter cake was purified by column chromatography using a petroleum ether / dichloromethane system to obtain approximately 24.3 g of product P25, with a yield of 57%.
[0085] Synthesis example 3:
[0086]
[0087] 3.1. Synthesis Scheme
[0088]
[0089] 3.2. Synthesis Process
[0090] Step 1: Under nitrogen protection, deuterated carbazole (15.75 g, 0.09 mol, 1 eq), halogenated compound (27.18 g, 0.09 mol, 1 eq), DMF (200 ml), and cesium carbonate (73.1 g, 0.225 mol, 2.5 eq) were added to the reaction flask. After the addition was complete, the reaction solution was heated to reflux and reacted for 12 h. The reaction was detected by HPLC. After cooling, 200 ml of water was added for washing, and the mixture was filtered. The filter cake was dried and purified by column chromatography using a petroleum ether / dichloromethane system to obtain approximately 31.67 g of intermediate 2, with a yield of 77%.
[0091] Step 2: Under nitrogen protection, intermediate 2 (31.67 g, 0.069 mol, 1 eq), phenylboronic acid (8.45 g, 0.069 mol, 1 eq), toluene (300 ml), ethanol (150 ml), potassium carbonate (23.8 g, 0.17 mol, 2.5 eq), and Pd(PPh3)4 (0.8 g, 0.0007 mol, 1%) were added to the reaction flask. After the addition was complete, the reaction solution was heated to reflux and reacted overnight. The reaction was sampled and detected by HPLC. After cooling, the reaction solution was washed with water, separated, and the organic phase was passed through silica gel and concentrated to dryness. Column chromatography was performed to obtain approximately 21.9 g of intermediate 3, with a yield of 78%.
[0092] Step 3: Under nitrogen protection, intermediate 3 (21.9 g, 0.053 mol, 1 eq) was added to the reaction flask, followed by 300 ml of ultra-dry tetrahydrofuran. The temperature was lowered to -78°C, and 2.5 M n-butyllithium (22.3 ml, 0.056 mol, 1.05 eq) was added dropwise. After the addition was complete, the reaction was maintained at this temperature for 1 h. Triisopropyl borate (11.9 g, 0.0636 mol, 1.2 eq) was added dropwise. After the addition was complete, the mixture was allowed to rise naturally to room temperature. A saturated ammonium chloride aqueous solution was added, and the mixture was separated. The organic phase was concentrated to dryness and recrystallized from ethyl acetate to obtain approximately 16.4 g of intermediate 4, with a yield of 83%.
[0093] Step 4: Under nitrogen protection, intermediate 4 (15.8 g, 0.042 mol, 1 eq), triazine compound (15.1 g, 0.042 mol, 1 eq), toluene (300 ml), ethanol (150 ml), potassium carbonate (14.49 g, 0.105 mol, 2.5 eq), and Pd(PPh3)4 (0.5 g, 0.00042 mol, 1%) were added to the reaction flask. After the addition was complete, the reaction solution was heated to reflux and reacted overnight. The reaction was sampled and detected by HPLC to indicate completion. The reaction solution was cooled, washed with water, separated, and the organic phase was passed through silica gel and concentrated to dryness. Column chromatography was performed to obtain approximately 16.67 g of product N59, with a yield of 61%.
[0094] Synthesis example 4:
[0095]
[0096] 4.1. Synthesis Scheme
[0097]
[0098] 4.2. Synthesis Process
[0099] Step 1: Under nitrogen atmosphere, add carbazole-D8 (50g, 285.4mmol, 1eq) and ultradry THF (500ml) to a three-necked flask, cool to below 0°C, add sodium tert-butoxide (32.9g, 342.4mmol, 1.2eq), and after the addition is complete, move to room temperature and stir for 2h. Dissolve the triazine compound (71g, 313.9mmol, 1.1eq) in 500mL of ultradry THF, cool to below 0°C, and slowly add it dropwise to the above reaction solution. After the addition is complete, allow to rise naturally to room temperature and stir for 2h. Add 500ml of water and stir for 30min, then filter to obtain approximately 72.5g of intermediate 5, with a yield of 70%.
[0100] Step 2: In a three-necked flask, intermediate 5 (44 g, 120.6 mmol, 1.05 eq), borate ester (42.9 g, 114.9 mmol, 1 eq), potassium carbonate (47.3 g, 344.7 mmol, 3 eq), and THF / water (600 ml + 200 ml) were added. Under N2 protection, tetrakis(triphenylphosphine)palladium (2.64 g, 2.3 mmol, 0.02 eq) was added. The mixture was refluxed at 85°C and stirred for 8 h. After cooling to room temperature, the mixture was filtered and purified by column chromatography to obtain 35 g of product N4, with a yield of 51%.
[0101] Synthesis example 5:
[0102]
[0103] 5.1. Synthesis Scheme
[0104]
[0105] 5.2. Synthesis Process
[0106] Under nitrogen protection, the intermediate bicarbazole compound (42 g, 0.1 mol, 1 eq) and the halogenated compound (23.3 g, 0.1 mol, 1 eq) were added to the reaction flask. Then, 400 ml of toluene, sodium tert-butoxide (11.5 g, 0.12 mol, 1.2 eq), Pd2(dba)3 (1.37 g, 0.0015 mol, 1.5% eq) and tbu-xphos (1.27 g, 0.003 mol, 3%) were added. After the addition was complete, the reaction solution was heated to reflux and reacted overnight. The reaction was detected by HPLC. After cooling, 200 ml of water was added for washing. The product was concentrated and purified by column chromatography, yielding approximately 24 g of product P47, with a yield of 40%.
[0107] Material performance testing:
[0108] Before device fabrication, the thermal stability of the synthesized product compound was tested, including thermogravimetric temperature (Tg) and glass transition temperature (Td). The Tg was determined using differential scanning calorimetry (DSC, Shinco DSCN-650) at a heating rate of 10 °C / min. The Td, measured at 5% weight loss in a nitrogen atmosphere, was determined using a TGAN1000 thermogravimetric analyzer at a nitrogen flow rate of 10 mL / min.
[0109] Test results show that the obtained compound exhibits excellent thermal stability and can meet the requirements for use in organic electroluminescent devices. Figures 6-13 These are the test spectra of some compounds.
[0110] Device performance testing:
[0111] Application Example 1:
[0112] ITO was used as the anode substrate material for the reflective layer, and its surface was treated sequentially with water, acetone, and N2 ions.
[0113] A 10 nm thick HT-1 doped with 5% NDP-9 is deposited on top of the ITO anode substrate to form a hole injection layer (HIL).
[0114] A first hole transport layer (HTL) is formed by evaporating 100 nm of HT-1 above the hole injection layer (HIL), and a second hole transport layer (GPL) with a thickness of 10 nm is formed by vacuum evaporating GP-1 above the first hole transport layer (HTL).
[0115] The prepared compounds P16, P40, and N39 were prepared in a mass ratio of 2.5:2.5:5 and used as the main material of the light-emitting layer. GD-1 was used as the dopant (the amount of GD-1 was 8% of the total weight of the main material) and was co-deposited to form a light-emitting layer with a thickness of 20 nm on the second hole transport layer (GPL).
[0116] HB-1 was deposited onto the light-emitting layer to obtain a hole blocking layer (HBL) with a thickness of 20 nm. ET-1 and LiQ were co-deposited onto the hole blocking layer (HBL) in a mass ratio of 5:5 to obtain an electron transport layer (ETL) with a thickness of 30 nm.
[0117] Magnesium (Mg) and silver (Ag) are mixed in a mass ratio of 9:1 and vapor-deposited onto the electron transport layer (ETL) to form an electron injection layer (EIL) with a thickness of 50 nm.
[0118] Silver (Ag) is then vapor-deposited onto the electron injection layer to form a cathode with a thickness of 12 nm. A 50 nm thick DNTPD is then deposited on the cathode sealing layer. Furthermore, the cathode surface is sealed with a UV-curable adhesive and a sealing cap containing a desiccant to protect the organic electroluminescent device from the influence of oxygen or moisture in the atmosphere.
[0119] Thus, the organic light-emitting device has been prepared.
[0120] The structural formulas of the compounds used in the above preparation process are as follows:
[0121]
[0122]
[0123] Comparative Examples 1-2:
[0124] The host material was prepared by configuring the mass ratio of P40:N39 = 5:5 to replace the host material in Application Example 1, and the organic light-emitting device of Comparative Example 1 was fabricated under the same preparation conditions as Application Example 1.
[0125] The host material was prepared according to the mass ratio of P16:N39 = 5:5 to replace the host material in Application Example 1, and the organic light-emitting device of Comparative Example 2 was fabricated under the same preparation conditions as Application Example 1.
[0126] Application Example 2-25:
[0127] By replacing the main material in Application Example 1 with different compositions and under the same preparation conditions as Application Example 1, organic light-emitting devices of Application Examples 2-25 were fabricated.
[0128] The configuration of the main materials for each application example is shown in Table 1 below.
[0129] Table 1
[0130]
[0131]
[0132] At a current density of 10 mA / cm 2 The characteristics of the organic electroluminescent devices fabricated in Comparative Examples 1-2 and Application Examples 1-25 were tested under the following conditions, and the test results are shown in Table 2 below:
[0133] Table 2
[0134]
[0135]
[0136] In Table 2, the emission color of the comparative and test examples is green, and the CIEx coordinate values are in the range of 0.21-0.28.
[0137] As can be seen from Comparative Examples 1 and 2 and Application Examples in the table above, under the same current density test conditions, compared with dual-body material devices containing only one type of P-type compound in the luminescent layer, the three-body material application examples 1, 19-21, and 24 with the same N-type compound, as well as other three-body material application examples with similar N-type compounds, exhibit better performance, reflected in lower operating voltage and higher luminous efficiency.
[0138] Subsequently, the luminescence lifetime of the organic electroluminescent devices in the comparative and application examples was tested at a current density of 10 mA / cm². 2 Under the test conditions, the luminescence lifetime T97% data (the time it takes for the luminescence brightness to decrease to 97% of the initial brightness) was obtained. Using the lifetime data of Comparative Example 2 as a reference, the test results are shown in Table 3:
[0139] Table 3
[0140]
[0141]
[0142] As can be seen from Comparative Examples 1 and 2 and Application Examples in the table above, under the same current density test conditions, compared with dual-subject devices whose emitting layer contains only one type of P-type compound, three-subject application examples 1, 19-21 and 24 with the same N-type compound, as well as other three-subject application examples with similar N-type compounds, have a longer luminescence lifetime.
[0143] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A composition for use in organic light-emitting devices, characterized in that, This includes a first compound represented by Formula 1, a second compound represented by Formula 2, and a third compound represented by Formula 3: [Formula 1] [Equation 2] In Equations 1 and 2: Ar1, Ar2, Ar3, and Ar4 each independently represent a substituted or unsubstituted C6-C18 aryl group or a substituted or unsubstituted C12-C18 heteroaryl group; the substituents of the C6-C18 aryl group and the C12-C18 heteroaryl group are each independently selected from one or more of deuterium, phenyl, and deuterated phenyl. R1-R 24 Each element is independently selected from either hydrogen or deuterium; [Formula 3] In Equation 3: One of Ar5 and Ar6 represents a substituted or unsubstituted C6-C12 aryl group, and the other represents a substituted or unsubstituted C12-C18 heteroaryl group; the substituents of the C6-C12 aryl group and the C12-C18 heteroaryl group are each independently selected from one or more of deuterium, phenyl and deuterated phenyl groups; L1 represents a direct bond, a C6-C12 aryl group that is either deuterated or unsubstituted; R 25 -R 32 Each of the following is independent: hydrogen, deuterium, phenyl, or deuterated phenyl, R 25 -R 32 At least seven of the R groups are hydrogen or deuterium.
2. The composition for an organic light-emitting device as described in claim 1, characterized in that: The heteroaryl groups in Formulas 1 and 2 are selected from heteroaryl groups containing O or N atoms; The heteroaryl group in Formula 3 is selected from heteroaryl groups containing an O atom.
3. The composition for an organic light-emitting device as described in claim 1, characterized in that, The third compound is selected from compounds represented by the following formula 3-1: [Equation 3-1] Where m is an integer selected from 0 to 3, t is an integer selected from 0 to 4, and R 33 and R 34 Each occurrence is identical or different and selected from deuterium, phenyl, or deuterated phenyl, and there is one and only one R. 33 Or R 34 It is either phenyl or deuterated phenyl.
4. The composition for an organic light-emitting device as described in claim 1, characterized in that, The third compound is selected from compounds represented by the following formula 3-2: [Equation 3-2] in: m is an integer selected from 0 to 3, t is an integer selected from 0 to 4, and n is an integer selected from 0 to 4; R 33 R 34 and R 35 Each occurrence, whether identical or different, is selected from deuterium, phenyl, or deuterated phenyl, and R 33 and R 34 Only one of them is phenyl or deuterated phenyl.
5. The composition for an organic light-emitting device as described in claim 1, characterized in that, In Equations 1 and 2: Ar1, Ar2, Ar3, and Ar4 are each independently selected from substituted or unsubstituted phenyl, biphenyl, dibenzofuran, or carbazole.
6. The composition for an organic light-emitting device as described in claim 1, characterized in that: In Equation 1, R1-R 10 All are hydrogen or all are deuterium; In Equation 2, R 11 -R 24 All are hydrogen or all are deuterium; In Equation 3, R 25 -R 32 At least seven of the R groups are either hydrogen or deuterium.
7. The composition for an organic light-emitting device as described in claim 1, characterized in that, The first compound is selected from any one of the following compounds:
8. The composition for an organic light-emitting device as described in claim 1, characterized in that, The second compound is selected from any one of the following compounds:
9. The composition for an organic light-emitting device as described in claim 1, characterized in that, The third compound is selected from any one of the following compounds:
10. An organic light-emitting device, comprising a cathode, an anode, and a light-emitting layer formed between the two, characterized in that, The light-emitting layer comprises the composition as described in any one of claims 1-9.