Electronic transfer layer, organic light-emitting device comprising electronic transfer layer and manufacturing method of organic light-emitting device

Abstract

The invention discloses an electronic transfer layer comprising an organic electronic transfer material of the formula 1 of and an organic electronic transfer material of the formula 2 of . The organic electronic transfer material in the formula 1 is one or any combination of more than two compounds of the structure of the formula 1; the organic electronic transfer material in the formula 2 is one or any combination of more than two compounds of the structure of the formula 2. According to the formula 1, Ar is selected from sub-polycyclic aromatic hydrocarbon with the carbon number ranging from 6 to 30, or selected from sub-fused heterocyclic aromatic hydrocarbon with the carbon number ranging from 6 to 30; R1 is phenyl or biphenyl or naphthyl or alkyl with 1-5 carbons or hydrogen; n is selected from integers from 2 to 3. According to the formula 2, Ar is selected from is selected from sub-polycyclic aromatic hydrocarbon with the carbon number ranging from 6 to 30, or selected from sub-fused heterocyclic aromatic hydrocarbon with the carbon number ranging from 6 to 30; n is selected from integers from 1 to 3. The weight ratio of the organic electronic transfer material in the formula 1 and the organic electronic transfer material in the formula 2 is 90:10-10:90.

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices, and relates to an electron transport layer, an organic electroluminescent device with the electron transport layer and a preparation method thereof. Background technique [0002] The lifetime of organic electroluminescent devices (OLEDs) is usually defined as the time required for the luminance to decay to 50% of the initial luminance (LT50), however such a definition is not practical. Nokia published an article at the 2007 International Display Information Conference (SID). In the article, OLED displays were used for mobile phone panels, and six different display screens were compared. The brightness of these six screens will vary with the extension of operating time. Attenuation, the picture quality will also decline. Using the actual human eye to evaluate the picture quality, it is found that when the picture brightness is attenuated to 5%, the human eye can judge the differen...

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Problems solved by technology

However, this literature does not mention the impact on lifespan

[0005] In summary, although the above patent documents have improved the performance of the device, they have not specifically improved the life of the LT90, and there is still a lot of room for improvement in the device performance in the above patent documents

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