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An organic electroluminescent device

An electroluminescent device, device technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problem of lack of application of hole blocking materials

Active Publication Date: 2021-10-22
BEIJING ETERNAL MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of organic material application in devices, focusing on overcoming the shortcomings of existing devices in the selection and application of hole blocking materials, and solving the problem of lack of application of hole blocking materials

Method used

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  • An organic electroluminescent device
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  • An organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Synthesis Example 1. Synthesis of Compound B1

[0065]

[0066] 2-bromo-5-hydroxybenzaldehyde (50g, 0.249mol), bis-pinacol borate (95g, 0.3735mol), dioxane (1.0L), potassium acetate (48.9g, 0.498mol) , Pd(dppf)Cl2 (0.98g) was added into the four-neck flask and heated to reflux, and the TLC plate was used to monitor the end of the reaction. About three hours to complete the reaction. After the reaction was completed, ethyl acetate and water were added for liquid separation, the organic phase was dried, passed through silica gel, and the intermediate M1, which was collected from the solvent, had a yield of 80.9% in 50 g and was directly used in the next reaction.

[0067] M1 (50g, 0.202mol), 2-bromo-5-hydroxybenzaldehyde (40.5, 0.202mol), dioxane (500ml), H 2 O (150ml), Pd (PPh 3 ) 4 (3.74g), K 2 CO 3 (56g) was added to a 2L four-neck flask, heated to reflux under nitrogen protection, and monitored by TLC at the end of the reaction. The reaction was completed in ...

Embodiment 2

[0074] Synthetic Example 2. Synthesis of Compound B2

[0075] The synthesis procedure was the same as that of compound A1, except that M5 was replaced by an equivalent amount of (4-(pyridin-2-yl)phenyl)boronic acid. After the reaction, 7.4 g of a white solid was isolated with a yield of 72.3%.

[0076] 1 H NMR (500MHz, Chloroform) δ9.11 (d, J = 14.8Hz, 2H), 8.75–8.62 (m, 4H), 8.47–8.31 (m, 6H), 7.92 (t, J = 1.4Hz, 2H) ,7.89–7.81(m,4H),7.38(td,J=14.9,2.9Hz,2H),7.14(dd,J=15.0,3.1Hz,2H),6.90(td,J=15.0,3.1Hz,2H ).

Embodiment 3

[0077] Synthetic Example 3. Synthesis of Compound B3

[0078] The synthesis procedure was the same as that of compound A1, except that M5 was replaced by an equivalent amount of (4-(quinolin-8-yl)phenyl)boronic acid, reacted, and 8.5 g of a white solid was isolated with a yield of 68.5%.

[0079] 1 H NMR (500MHz, Chloroform) δ9.11 (d, J = 15.1Hz, 2H), 8.83 (dd, J = 15.0, 3.1Hz, 2H), 8.48–8.38 (m, 4H), 8.15 (dt, J = 15.0, 2.9Hz, 2H), 7.92(s, 2H), 7.74(dt, J=14.8, 3.1Hz, 2H), 7.64(dd, J=14.9, 3.2Hz, 2H), 7.50(t, J=14.9 Hz,2H),7.32–7.18(m,10H).

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Abstract

The invention relates to an organic electroluminescent device, which has a hole blocking layer between the light-emitting layer and the electron transport layer, the HOMO energy level of the hole blocking layer material is higher than 5.6eV, and the energy band gap is larger than 2.5eV , the triplet energy level T1 is higher than 2.5eV, and the hole blocking layer material is selected from compounds represented by general formula (A), general formula (B) or general formula (C): the device of the present invention has low driving voltage, light emitting The advantage of high efficiency.

Description

technical field [0001] The invention relates to a novel organic electroluminescence device. Background technique [0002] With the continuous advancement of OLED technology in the two major fields of lighting and display, people pay more attention to the research of high-efficiency organic materials that affect the performance of OLED devices. An organic electroluminescent device with high efficiency and long life is usually a combination of device structure and various organic materials. The result of the optimized collocation. In the most common OLED device structure, the following types of organic functional layers are usually included: hole injection layer (HIL), hole blocking layer (HTL), electron blocking layer (EBL), light emitting layer (EML), hole blocking layer (HBL) electron transport layer (ETL) and electron injection layer (EIL). Among them, HBL is between EML and ETL, and is mainly used to block the outgoing of EML holes, enhance the incoming of ETL electrons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/6572H10K50/11H10K2101/40H10K50/18
Inventor 李轶文邢其锋任雪艳
Owner BEIJING ETERNAL MATERIAL TECH