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Organic electroluminescent device and display device

An electroluminescent device and electroluminescent technology, which are applied to electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of substandard blue color coordinates, low exciton utilization, blue damage, etc., and achieve good color purity, The effect of suppressing energy loss and reducing efficiency roll-off

Active Publication Date: 2021-04-23
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the exciton utilization rate in the actual process is often far below 62.5%, so the efficiency and lifetime of the corresponding organic electro-device often cannot meet the requirements.
In addition, the half-peak width of the common TTA at present is relatively wide, which will not only cause the color coordinates of blue light to fail to meet the standard, but also cause certain "blue harm" problems

Method used

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  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device

Examples

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preparation example Construction

[0097] The invention also provides a preparation method of the organic electroluminescence device, which comprises sequentially depositing an anode, a hole transport region, a light-emitting layer, an electron transport region and a cathode on a substrate, and then encapsulating. Among them, when preparing the light-emitting layer, the evaporation rate of the TTA material and the evaporation rate of the resonant TADF material are adjusted to make the dye reach a preset doping ratio by using a multi-source co-evaporation method. The light-emitting layer is formed by co-evaporating the source and the resonant TADF material source. The deposition methods of the anode, the hole transport region, the electron transport region and the cathode are the same as the existing methods in the art.

[0098] An embodiment of the present invention also provides a display device, which includes the organic electroluminescent device as provided above. Specifically, the display device may be a ...

Embodiment 1

[0103] Synthesis Example 1: Synthesis of Compound A4

[0104]

[0105] Under the protection of argon, 5-bromo-2-phenylpyridine (10g) was dissolved in ultra-dry tetrahydrofuran (200mL) solution, then n-butyllithium (2.5M, 17mL) was slowly added at -80°C into the above solution. Subsequently, anthracene-9,10-dione (3.4 g) was added in one portion. The resulting mixture was stirred for 2 hours, during which time the temperature was raised to 20°C. Subsequently, cold water (100 mL) was added and the organic phase was separated. The aqueous phase was extracted with ethyl acetate (100 mL). The organic portion was dried over magnesium sulfate and the volatiles were removed in vacuo to leave a foamy solid. Potassium iodide (14 g), sodium hypophosphite (10 g) and acetic acid (150 mL) were added to the solid, and the mixture was heated to reflux for 2 h. After cooling, the precipitate was collected and washed with copious THF / H2O (7:3). After drying, 3.4 g of yellow compound 1 ...

Embodiment 2

[0108] Synthesis Example 2: Synthesis of Compound A421

[0109]

[0110] Under the protection of argon, 9,10-bis(3-bromophenyl)anthracene (5.36g), pyridine-3-boronic acid (3.10g), palladium chloride (PdCl 2 , 0.266g), triphenyl phosphite (0.786g), potassium carbonate (12.4g), toluene (166mL), ethanol (120mL) and distilled water (153mL) were sequentially added into a glass flask. The reaction mixture was heated at reflux for 5 h, then the organic portion was separated. The volatiles were removed in vacuo to leave a gray residue which was purified by column chromatography on silica gel using petroleum ether / ethyl acetate (1:1) as eluent. 3.7 g of white compound A421 are obtained. The compound was obtained by H NMR spectroscopy ( 1 HNMR) and high resolution mass spectrometry (HRMS) are characterized as follows:

[0111] 1 H NMR (600MHz, CDCl 3 -d6,δ):8.97(s,2H),8.61(d,J=7.2Hz,2H),7.97(d,J=12.4Hz,2H), 7.81(s,2H),7.78–7.74(m, 8H), 7.56(t, J=10Hz, 2H), 7.39–7.37(m, 6H);

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Abstract

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises a light-emitting layer; the light-emitting layer comprises a triplet state- triplet state annihilation material and a resonance type thermal activation delayed fluorescence material. The first excited singlet energy level of the triplet state-triplet state annihilation material is greater than the first excited singlet energy level of the resonance type thermal activation delayed fluorescence material, and the first excited triplet energy level of the triplet state-triplet state annihilation material is less than the first excited triplet energy level of the resonance type thermal activation delayed fluorescence material. The rotary orbit coupling constants SOC of the nth excited triplet state and the first excited singlet state of the triplet state-triplet state triplet annihilation material meet the following requirements: n is larger than or equal to 2 and is less than or equal to 6, and SOC is larger than or equal to 0.30 cm<-1>. The organic electroluminescent device provided by the invention has relatively excellent light-emitting efficiency, service life and color purity.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a display device, belonging to the technical field of organic electroluminescence. Background technique [0002] An organic electroluminescent device is a device that is driven by an electric current to achieve the purpose of emitting light. Specifically, an organic electroluminescent device includes a cathode, an anode, and functional layers such as a light-emitting layer between the cathode and the anode. When a voltage is applied, electrons from the cathode and holes from the anode will respectively migrate to the light-emitting layer and combine to generate excitons, and then emit light of different wavelengths according to the characteristics of the light-emitting layer. [0003] At present, the blue-light materials used in the production line for organic electroluminescent devices are mainly common triplet-triplet annihilation materials (TTA, referred to as: triple-triple annihil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L27/32
CPCH10K59/00H10K50/11H10K2101/40
Inventor 段炼蔡明瀚王宏宇曹方义张先平梁倩倩魏现鹤
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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