Diamine derivative and organic electroluminescent device thereof

By developing diamine derivatives with suitable HOMO energy levels and high hole mobility as hole transport layer and covering layer materials, the problems of low luminous efficiency and short service life of existing organic electroluminescent devices are solved, and high-efficiency luminescence is achieved. and long life effects.

CN113735759AActive Publication Date: 2021-12-03CHANGCHUN HYPERIONS TECH CO LTD
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Patent Information

Application Number
CN202111130095.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2021-09-26
Publication Date
2021-12-03
Estimated Expiration
2041-09-26

AI Technical Summary

Technical Problem

The hole transport layer and covering layer materials of existing organic electroluminescent devices have problems such as low luminous efficiency and short service life. In particular, due to the plasma element effect and waveguide effect in the cathode and covering layer, the luminescence of top-emitting devices is Performance is limited.

Method used

A diamine derivative was developed as a hole transport layer and covering layer material with a suitable HOMO energy level, high hole mobility and thermal stability to improve the luminous efficiency and service life of the device.

Benefits of technology

By using the diamine derivative, the luminous efficiency and service life of the organic electroluminescent device are significantly improved, and the driving voltage is reduced, showing higher luminous efficiency and longer service life.

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Abstract

The invention provides a diamine derivative and an organic electroluminescent device thereof, and relates to the technical field of organic electroluminescent materials. The diamine derivative shown in the formula 1 contains a 9-fluorene substituted carbazole functional group, and a hole transport region or a covering layer of the organic electroluminescent device contains the carbazole derivative shown in the formula 1. The diamine derivative shown in the formula 1 has good hole transport performance and good stability, and the prepared organic electroluminescent device with the hole transport region containing the diamine derivative shown in the formula 1 shows high luminous efficiency, long service life and low driving voltage. Besides, the diamine derivative of the formula 1 is a good covering layer material, and the prepared covering layer contains the organic electroluminescent device of the diamine derivative of the formula 1, so that the organic electroluminescent device has high luminous efficiency and long service life.
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