A type of quinoline acridine-5,9-dione MR-TADF red light luminescent material and its preparation method and application

By designing quinoline acridine-5,9-dione MR-TADF red light material and utilizing the resonance effect and rigid structure, the narrow spectrum and high efficiency problems of red light TADF materials were solved, the application of high color purity red light OLEDs was realized, and the synthesis complexity and cost were reduced.

CN119462691BActive Publication Date: 2025-10-03CHANGZHOU UNIV
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Patent Information

Application Number
CN202411778215.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-10-03
Estimated Expiration
2044-12-05

AI Technical Summary

Technical Problem

Existing red light TADF materials face the problems of low luminescence color purity and wide emission peak, which makes it difficult to meet the requirements of high color gamut. In addition, the synthesis is complex and the cost is high, which limits its practical application in the red light band.

Method used

A class of MR-TADF red-light luminescent materials with quinoline-acridine-5,9-dione as the central core and fused oxygen-bridged triphenylamine was designed. The resonance effect between electron-deficient nitrogen/carbonyl and electron-rich oxygen/nitrogen was produced, and the rigid conjugated skeleton and tert-butyl substituents were combined to suppress molecular vibration relaxation and reorganization energy, thereby achieving narrow spectrum emission.

Benefits of technology

It achieves narrow spectrum red light emission with a half-width of less than 70nm, improves luminous efficiency and color purity, reduces synthesis difficulty and cost, and expands the application potential of red light OLEDs.

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Abstract

The present invention discloses a class of quinoacridine-5,9-diketone MR-TADF red light emitting materials and their preparation methods and applications, belonging to the technical field of organic photoelectric materials. The molecules of this type of material promote the minimization of bonding / antibonding of frontier molecular orbitals through the resonance effect generated by electron-deficient nitrogen / carbonyl and electron-rich oxygen / nitrogen. In addition, the rigid conjugated skeleton suppresses the structural relaxation of the molecular excited state and the vibration coupling between the excited state and the ground state, thereby obtaining a red light emitting material with a narrow half-width (<70nm) and high luminous efficiency; the introduction of a tert-butyl group on the periphery of the molecule can reduce the reorganization energy of the molecule; grafting different substituent units can regulate the stacking and film-forming properties of the molecule. The maximum emission peak of the obtained doped red light electroluminescent device is located at 601 nm, the half-width is 68 nm, and the corresponding maximum external quantum efficiency is 9.38%, which has a wide range of applications in the fields of organic electroluminescent displays and biological imaging.
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