Thermally excited delayed fluorescence materials based on non-conjugated polymers of phenylacridine and phenyltriazine substituents

By designing non-conjugated polymers with phenylacridine and phenyltriazine substituents and utilizing the spatial charge transfer mechanism, the problems of red shift and low PLQY in the conjugated DA structure were solved, and efficient luminescent material performance was achieved.

CN115819661BActive Publication Date: 2025-10-03HEILONGJIANG UNIV
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Patent Information

Application Number
CN202210395905.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2022-03-15
Filing Date
2022-04-15
Publication Date
2025-10-03
Estimated Expiration
2042-04-15

AI Technical Summary

Technical Problem

Existing conjugated DA structured light-emitting polymers have red-shift problems when adjusting the emission color and excited state energy levels, and the fluorescence quantum yield (PLQY) is not high, which makes it difficult to meet the needs of high-efficiency OLEDs.

Method used

Non-conjugated polymers based on phenylacridine and phenyltriazine substituents were designed. Through the space-space charge transfer (TSCT) mechanism, phenylacridines were used as charge donors and phenyltriazines as charge acceptors to form non-conjugated polymers, reduce the triplet state energy difference (ΔEST), and improve the fluorescence quantum yield (PLQY).

Benefits of technology

A smaller triplet energy difference is achieved, the fluorescence quantum yield is increased, red shift is avoided, the luminescence quality and comprehensive performance are improved, and the preparation method is simple and controllable.

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Abstract

The present invention provides a non-conjugated polymer thermally excited delayed fluorescent material based on phenyl acridine and phenyl triazine substituents, which is a polymer obtained by polymerizing styrene with acridine substituents and styrene with phenyl triazine substituents as monomers. The material can reduce the triplet energy difference (ΔE ST ), which improves the fluorescence quantum yield (PLQY), improves the luminescence quality, and greatly improves the overall performance of the prepared thermally excited delayed fluorescence light-emitting device.
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