高性能的深蓝光有机电致发光(OLED)材料的开发是推进OLED产业化进程的关键。虽然“新一代”电致荧光材料有望能集高性能与低成本于一身，但受限于其各自对三线态激子的利用机制，现有的此类深蓝光OLED难于兼具高的效率和低的效率滚降。本项目针对目前深蓝光材料开发所存在的问题，提出“反系间窜越（RISC）为主，三线态-三线态湮灭（TTA）为辅”的三线态激子利用新机制，通过将“热”和“冷”的三线态激子分别经RISC和TTA途径予以高效转化、利用，从而提高器件效率，并降低器件的效率滚降。通过对能实现这一机制的材料的能级要求和分子结构的深入分析，设计、合成多种新型深蓝光OLED材料，制备兼具高效、低效率滚降的高性能深蓝光OLED，并深入研究分子的构效关系，探索OLED中三线态激子的转化、利用机制。本项目的实施有望为OLED材料的开发提供新思路，为OLED的产业化提供新材料，为分子的构效关系提供新认识。

The exploitation of high-performance deep-blue organic light-emitting diode (OLED) materials is the key to kick off the commercialization of OLEDs. Although electrofluorescent materials capable of harvesting triplet excitons (i.e., the “new-generation” OLED materials) are perspective candidates to fabricate high-performance low-cost OLEDs, so far most of the “new-generation” deep-blue OLEDs suffer from an unsatisfactory trade-off between efficiency and efficiency roll-off, which should be ascribed to their inherent triplet exciton harvesting mechanisms. In view of these problems, herein we propose a novel triplet exicton harvesting mechanism, i.e.,“reverse intersystem crossing (RISC) dominated, triplet-triplet annihilation (TTA) assisted” mixed mechanism, so that the “hot” and “cold” triplet excitons could be rapidly and efficiently harvested via RISC and TTA processes, respectively, leading to simultaneously enhanced triplet exciton utilization efficiency and reduced efficiency roll-off. Through in-depth analysis on the energy level alignment and molecular structure requirements of the corresponding materials, a variety of novel deep-blue OLED materials will be designed and synthesized, and high-performance deep-blue OLEDs showing not only high efficiency but also low efficiency roll-off will be fabricated. Furthermore, through in-depth studies on structure-properties correlations of these materials, the transformation and utilization processes of triplet excitons within OLEDs might be unveiled. The implementation of this project is expected to provide new ideas for the development of OLED materials, to provide new materials for the commercialization of OLEDs, and to gain new insight to the structure-properties correlations of OLED materials as well.