有机发光材料中的三重激发态  

Triplet Excited States in Organic Luminescent Materials

作　　者：肖磊鑫 张春峰 Xiao Lei-Xin;Zhang Chun-Feng(National Laboratory of Solid State Microstructures,School of Physics,and Collaborative Innovation Center for Advanced Microstructures,Nanjing University,Nanjing,210093)

机构地区：[1]南京大学物理学院,固体微结构物理国家重点实验室、人工微结构科学与技术协同创新中心,南京210093

出　　处：《物理学进展》2020年第2期44-53,共10页Progress In Physics

基　　金：supported by the National Key R&D Program of China (Grant Nos. 2018YFA0209101 and 2017YFA0303700);the National Science Foundation of China (Grant NOs. 21922302, 21873047, 91833305, and 91850105)

摘　　要：有机发光材料有望广泛应用于新一代柔性光电子器件。由于自旋多重性,有机分子发光材料中单重激发态和三重激发态转换较慢,限制有机发光器件特别是电注入荧光器件的效率。我们介绍下近年来通过分子设计操控激发不同时间尺度三重态的动力学来突破这一限制的策略,通过控制激发单重态和激发三线态之间的电子耦合,利用热激子系间窜越、反向系间窜越、激发三重态稳定化等过程能够有效提高有机发光材料的发光效率。在此基础上实现的热活化延迟荧光、有机长余辉发光等在有机发光二极管、传感器、生物成像等领域有重要潜在应用价值。Organic luminescent materials are promising for next-generation flexible optoelectronics.Nonetheless,the luminescent efficiency in organic molecules is limited by a barrier between the singlet and triplet excited states.In this mini review,we focus on the strategies to overcome such limit by manipulating the dynamics of triplet excited states.By designing the electronic coupling between singlet and triplet excited states,the processes of hot intersystem crossing,reversal intersystem crossing and triplet state stabilization at different stages are successfully implemented to promote the light emission in the organic luminescent materials.The understanding of the mechanisms drives the development of thermally-activated delayed fluorescence and organic long-persistent luminescence,which are promising for the applications of organic light-emitting diodes,sensors and bioimaging.

关 键 词：有机发光材料 激发三重态 电荷转移态 电荷分离态 热激子 热系间窜越 反向系间窜越 三重态稳定化 热活化延迟荧光 长余辉发光 有机发光二极管 

分 类 号：O641.3[理学—物理化学]