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Organic light-emitting device

An electroluminescent device, an organic technology, applied in the direction of electric solid state devices, electrical components, semiconductor devices, etc., can solve the problems of large energy level difference, low device efficiency, and poor life.

Pending Publication Date: 2021-09-03
合肥鼎材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used OLED materials and device structures cannot completely solve the problems of OLED product efficiency, lifespan, cost, etc.
In the current light-emitting devices, the light-emitting layer composed of many phosphorescent materials generally has a large difference in energy levels between the singlet state and the triplet state of such materials, resulting in a low intersystem crossing rate constant, resulting in insufficient energy transfer, which eventually leads to the device's failure. lower efficiency, poorer lifespan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0065] Synthesis of Compound P1

[0066]

[0067] M (30mmol), 7H-benzocarbazole (30mmol), sodium tert-butoxide (40mmol), tris(dibenzylideneacetone) dipalladium (1%), tri-tert-butylphosphine (2%), toluene 200ml was added to the reaction flask, heated to 120°C for 6 hours, TLC monitored the completion of the reaction, after cooling down, water and dichloromethane were added for extraction, the organic phase was concentrated and recrystallized from toluene to obtain compound P1.

Synthetic example 2

[0069] Synthesis of Compound P2

[0070] Add M (0.1mol), p-chlorophenylboronic acid (0.12mol), potassium carbonate (0.2mol), dioxane (150ml), tetrakis(triphenylphosphine)palladium (1%), and water 30ml into the reaction flask , heated to 80° C. for 5 h, and TLC monitored the completion of the reaction. After cooling down, a large amount of solids precipitated, filtered, and the filter cake was washed with ethanol and dried to obtain intermediate M2.

[0071] M2 (30mmol), 7H-benzocarbazole (30mmol), sodium tert-butoxide (40mmol), tris(dibenzylideneacetone) dipalladium (1%), tri-tert-butylphosphine (2%), toluene 200ml was added to the reaction flask, heated to 120°C for 6 hours, TLC monitored the completion of the reaction, after cooling down, water and dichloromethane were added for extraction, the organic phase was concentrated and recrystallized from toluene to obtain compound P2.

Synthetic example 3

[0073] Synthesis of Compound P11

[0074] The method is the same as that in Synthesis Example 2, except that 7H benzocarbazole is replaced by an equivalent amount of carbazole to obtain compound P11.

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Abstract

The invention relates to an organic light-emitting device. The device comprises one or more light-emitting areas, each light-emitting area comprises an anode layer, a cathode layer and one or more organic layers located between the cathode layer and the anode layer, each organic layer comprises a light-emitting layer, and the light-emitting layer comprises a first material and a second material. The light-emitting layer is characterized in that: the triplet state energy level of the second material is higher than the triplet state energy level of the first material, the first material has a structure represented by a following formula (I), and the second material has a structure represented by a following formula (II). The organic light-emitting device provided by the invention has excellent device performance and stability.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to an organic electroluminescence device adopting a novel luminescent material scheme. Background technique [0002] Organic electroluminescent display (English name Organic Light Emiting Display, referred to as OLED) is an active light-emitting display device. Due to its advantages such as simple manufacturing process, low cost, high contrast, wide viewing angle, and low power consumption, it is expected to become the next generation of mainstream panels. Display technology is one of the most concerned technologies among panel display technologies. [0003] OLED products are gradually entering the market, and people have higher and higher requirements for the performance of such products. The currently used OLED materials and device structures cannot completely solve the problems of OLED product efficiency, lifespan, cost and other aspects. In the current light-emitting...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/636H10K85/654H10K85/657H10K85/6576H10K85/6572H10K85/6574H10K50/11H10K2101/40
Inventor 孙龙李之洋刘嵩
Owner 合肥鼎材科技有限公司
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