A boron-containing nitrogen polyheterocyclic material and an organic electroluminescent device comprising the same

By designing boron-nitrogen multi-membered heterocyclic materials containing multiple benzene rings and boron-nitrogen six-membered heterocyclic structures, the problems of slow reverse intersystem crossing rate and short lifetime of existing MR-TADF materials were solved, and efficient and stable OLED device performance was achieved.

CN121537425BActive Publication Date: 2026-06-05JILIN OPTICAL & ELECTRONICS MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JILIN OPTICAL & ELECTRONICS MATERIALS CO LTD
Filing Date
2026-01-20
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing multiple resonant thermally activated delayed fluorescence materials suffer from problems such as low reverse intersystem crossing rate, long delayed fluorescence lifetime, and susceptibility to triplet exciton annihilation at high concentrations. In particular, heavy atom blue light MR-TADF materials are scarce in the blue light region, which limits the high efficiency and stability of OLED devices.

Method used

Boron-nitrogen multi-membered heterocyclic materials with a symmetrical structure containing multiple benzene rings, two fluorene groups, and a boron-nitrogen six-membered heterocycle are used. By rationally introducing heavy atoms such as oxygen, sulfur, and selenium, the spin-orbit coupling effect is enhanced, the reverse intersystem crossing rate is increased, and high efficiency of charge transfer and high luminescence efficiency in the aggregated state are achieved by constructing a multiple resonance framework.

Benefits of technology

It achieves narrow emission spectrum, high exciton utilization, reduced molecular vibrational relaxation, extended lifespan, and improved photoelectric conversion efficiency and stability of OLED devices.

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Abstract

The application belongs to the technical field of organic photoelectric materials, and provides a boron-nitrogen-containing multi-heterocyclic material and an organic electroluminescent device containing the same. The boron-nitrogen-containing multi-heterocyclic material provided by the application is a novel sensitization material and a doping material with a boron-nitrogen six-membered heterocyclic ring as a molecular skeleton center and containing a multi-benzene ring structure. The structure has good stability, can inhibit molecular vibration relaxation and reduce non-radiative transition, and thus a better service life is achieved. Meanwhile, the material has good high-exciton utilization and small ΔEST, can more easily realize intersystem crossing, and achieve better photoelectric conversion efficiency.
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