论文部分内容阅读
有机电致发光二极管(OLED)在全彩色平板显示和固态照明领域具有广泛的应用而倍受关注。在电场激发下,单重态激子与三重态激子的比值为1∶3。传统的荧光材料只能利用单重态激子发光,内部量子效率(IQE)最高为25%。热活性型延迟荧光(TADF)材料可将三重态激子反系间跨越(RISC)到单重态能级而发出延迟荧光,理论上内部量子效率可达100%。设计TADF材料的关键在于分子要同时满足高荧光量子产率和小的第一激发单重态与第一激发三重态能级差(ΔEST)。综述了近几年TADF材料的研究进展,重点介绍了TADF材料的设计思想和器件性能。
Organic light-emitting diodes (OLEDs) are attracting the attention of a wide range of applications in the field of full-color flat panel displays and solid-state lighting. Under electric field excitation, the ratio of singlet excitons to triplet excitons is 1: 3. Traditional fluorescent materials can only utilize singlet excitons to emit light, with an internal quantum efficiency (IQE) of up to 25%. Thermally active delayed fluorescence (TADF) materials emit delayed fluorescence by crossing triplet excitons across the interstellar (RISC) to singlet energy levels, theoretically with an internal quantum efficiency of up to 100%. The key to designing a TADF material is that the molecule should satisfy both high fluorescence quantum yield and small first excitation singlet state and first excitation triplet energy difference (ΔEST). The research progress of TADF materials in recent years is reviewed. The design idea and device performance of TADF materials are introduced emphatically.