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Multi-resonance thermally activated delayed fluorescence emitters based on BNCz framework.

Jia-Ming Jin¹, Chengxiang Shi¹, Wen-Cheng Chen^1,2

¹School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China. yphuo@gdut.edu.cn.

Chemical Communications (Cambridge, England)

|June 26, 2025

Summary

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials offer narrow emission and high efficiency for OLED displays. This review details BNCz modifications, enhancing photophysical properties and OLED performance for advanced material design.

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Area of Science:

Organic electronics
Materials science
Photophysics

Background:

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are crucial for high-definition organic light-emitting diode (OLED) displays due to their narrow emission bands and 100% exciton utilization.
Boron and nitrogen-based MR-TADF emitters have shown high external quantum efficiencies and narrow electroluminescence spectra.
BNCz derivatives are particularly promising due to their facile synthesis and structural tunability.

Purpose of the Study:

To review and categorize structural modifications of BNCz-based MR-TADF materials.
To analyze the impact of these modifications on photophysical properties and OLED device performance.
To provide insights for the future design and application of advanced OLED materials.

Main Methods:

Systematic categorization of substituents based on structural characteristics.
Discussion of functional substitutions at para and meta positions relative to the boron atom.
Analysis of strategies including donor/acceptor groups, steric hindrance modulation, and chiral group incorporation.

Main Results:

Substitutions significantly influence intersystem crossing, color tuning, aggregation-caused quenching, and circularly polarized emission.
Specific modifications enhance photophysical properties of the BNCz core.
Optimized BNCz derivatives lead to improved overall OLED device performance.

Conclusions:

Structural modification of BNCz is a key strategy for developing high-performance MR-TADF materials.
Understanding substituent effects is critical for designing efficient and stable OLED emitters.
This review provides a framework for future research in BNCz-based OLED materials.