Blue light thermal activated delayed fluorescence material, and preparation method and application thereof

By designing the blue light thermally activated delayed fluorescent material TRz-POAc, the problems of low efficiency and difficult carrier transport in blue light materials in OLEDs have been solved, achieving high-efficiency and high-color-purity blue light emission, which is suitable for undoped devices.

CN122255181APending Publication Date: 2026-06-23SHANTOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANTOU UNIV
Filing Date
2026-04-02
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing OLED technology, blue light materials are inefficient and suffer from problems such as concentration quenching and difficulties in carrier transport. In particular, it is difficult to achieve high-efficiency and high-color-purity blue light emission in undoped devices.

Method used

A blue light-emitting thermally activated delayed fluorescence material, TRz-POAc, was designed and synthesized using triazine as the acceptor and organophosphorus-modified diphenyl acridine as the donor through Ullmann coupling, Grignard reaction, and oxidative glycosylation. This process inhibits intermolecular π-π stacking and regulates charge distribution, thereby improving carrier transport.

Benefits of technology

It achieves high-efficiency blue light emission with an external quantum efficiency of up to 21.00%, excellent color coordinates, and is suitable for undoped devices, reducing fabrication complexity and cost.

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Abstract

This invention discloses a blue thermally activated delayed fluorescence (TADF) material, its preparation method, and its applications, belonging to the field of luminescent materials technology. Using a triazine unit as an electron acceptor and an organophosphorus-modified diphenyl acridine as an electron donor, a blue TADF luminescent material, TRz-POAc, was synthesized. Organophosphorus modification can effectively regulate the molecular twist angle, intermolecular interactions, and photophysical properties. The prepared TRz-POAc exhibits a molecular twist angle of 83.7°, with no significant π-π stacking between molecules, and a singlet-triplet bandgap (ΔEST) as low as 0.02 eV, enabling efficient reverse system crossing (RISC) processes. In doped devices, the maximum EQE reaches 22.26% with 20 wt% doping; in undoped devices, the maximum EQE is still as high as 21.00%, demonstrating excellent deep blue light emission performance and its application potential in undoped devices.
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