Research progress on multiple resonance thermally activated delayed fluorescence materials featuring red, green, and blue emission based on 1,4-azaborine

Abstract

Narrowband multiple resonance thermally activated delayed fluorescence (MR-TADF) materials have attracted significant attention due to their potential applications in high-definition organic light-emitting diode (OLED) displays. This review focuses on MR-TADF materials derived from the 1,4-azaborine core, systematically summarizing recent advances in the development of red (R), green (G), and blue (B) narrowband emitters. Compared to conventional donor–acceptor (D–A) type TADF materials, MR-TADF materials are characterized by their rigid conjugated frameworks and multiple resonance effects, through which structural vibrations and electronic transition broadening are significantly suppressed, enabling the realization of ultra-narrow full-width at half-maximum (FWHM) and high color purity emission. In this review, the structure–property relationships between molecular design, photophysical characteristics, and device performance of MR-TADF materials are comprehensively investigated. Future research directions are also proposed, including the development of novel heteroatom-embedded systems, computation-assisted molecular design, and optimization of solution-processing techniques. This systematic overview is intended to provide significant theoretical guidance and technical support for the development of high-performance narrowband MR-TADF materials, thereby facilitating the commercialization of ultra-high-definition display technologies.