新一代有机电致发光材料突破激子统计
摘要
Exciton (or spin) statistics is a basic physical principle, which determines the singlet and triplet excitons ratio (1:3) formed in an organic semiconductor device. In recent years, the OLED materials based on new principles (reverse intersystem crossing, delayed fluorescence) received widespread attentions in this field. This kind of materials rejuvenates the spin-statistics theory, and it is expected to develop into a low-cost, high-performance next-generation OLED materials. Domestic researchers in organic optoelectronics also attached great importance to it, and a number of research institutions have conducted research arrangement in this field. From the current development situation, the emitting mechanisms, principles and materials design ideas of this material are yet to be further explored and clear. In this review, we review the progress of the exciton statistics, and analyze a variety of ways to improve exciton utilization efficiency. Furthermore, we propose the "hot exciton" new ideas and material design principles to improve exciton utilization, and the devices harvest the exciton utilization efficiency close to 100%.