聚合物热激活延迟荧光材料的分子设计与器件性能

聚合物热激活延迟荧光(TADF)材料应用于有机发光二极管(OLEDs)中以来,取得了飞速发展,迄今为止已经报道了多种不同分子结构及性能优异的聚合物TADF发光材料.它们具有不含重金属的化学结构、100%的理论内量子效率和易于通过溶液加工进行大面积制造的优势.本文从分子结构和发光颜色2个角度总结了不同结构TADF聚合物的研究进展,重点介绍了我们课题组在长链型TADF聚合物设计与OLEDs器件性能方面的研究工作,探究TADF聚合物颜色调控与效率提升的途径,论述了TADF聚合物存在的问题与未来发展.

Molecular Design and Device Performance of Thermally Activated Delayed Fluorescent Polymer Materials

Thermally activated delayed fluorescence(TADF) polymer materials have achieved rapid development since their application in organic light emitting diodes(OLEDs). So far, various TADF polymer materials with different molecular structures and excellent properties have been reported, of which external quantum efficiency of OLEDs have achieved 23.5%. They possess all-organic chemical structures without heavy metals, 100% theoretical internal quantum efficiency, and the advantages of large-area manufacturing by solution process. Nevertheless, when using polymers to develop low-cost display or device, there are still many problems to be overcome, such as, the lower quantum efficiency compared to small molecules, efficiency roll-off at high brightness, and poor device stability. In addition, the efficiency development of devices with different colors of light is obviously uneven and the efficiency of high-color purity devices is poor. Herein, we summarize the research progresses of TADF polymers with different structures and discuss the efficiency development of three primary colors and white OLEDs devices. The emphasis of this review is especially focused on our research work on linear TADF polymers design and their LOEDs device performance, and summarizes our research on TADF polymer color tuning and efficiency inprovement. In addition, the problems and future development of TADF polymers were also discussed in the end.