基于热活化敏化荧光机制的有机发光二极管材料与器件  

Materials and Devices of Thermally Activated Sensitized Fluorescence Organic Light-emitting Diodes

作　　者：张海[1] 张东东[1] 段炼[1] Hai Zhang;Dong-dong Zhang;Lian Duan(Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education,Department of Chemistry,Tsinghua University,Beijing 100084)

机构地区：[1]有机光电子与分子工程教育部重点实验室、清华大学化学系,北京100084

出　　处：《高分子学报》2023年第6期943-961,共19页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号52222308,51903137)资助项目.

摘　　要：热活化敏化荧光(TSF)被称作有机发光二极管(OLED)“第四代发光技术”,是以热活化延迟荧光材料作为敏化剂,高效发光的荧光材料作为掺杂染料,通过二者之间高效的Förster能量传递实现100%激子利用,突破了三线态高效上转换与单线态高效辐射跃迁之间的矛盾.本文围绕TSF-OLED器件的发光效率、寿命及光色等核心指标,针对激子的调控和利用这一关键科学问题,重点介绍了我们课题组近年来在TSF技术的机理研究、高效稳定敏化剂及窄光谱材料的设计开发以及高性能器件的构筑等方面的研究工作.最后讨论了TSF技术所存在的挑战和未来发展前景.Thermally activated sensitized fluorescence(TSF)with thermally activated delayed fluorescence materials(TADF)as sensitizers and highly efficient conventional fluorescent dopants(CFD)as emitters was called the“fourth-generation luminescence technology”of organic light-emitting diodes(OLEDs),which can achieve exciton utilization with low efficiency roll-off and narrowband emission simultaneously,compared with the traditional TADF emitters.The functionally separated materials of TSF-OLEDs are connected with each other by the rapid Förster energy transfer between sensitizer and dopant,further breaking the trade-off between effective up-conversion of triplet and impressive radiative decay of singlet.Herein,focusing on the keystone about how to realize the precise modulation and efficient utilization of excitons generated from carriers recombination,we systematically summarize the recent research progress of TSF in our group from the perspective of the efficiency,lifetime and purity of TSF-OLEDs.Starting from the luminescent mechanism of the TSF-OLEDs,we display some methods which can restrict the energy loss pathways to improve efficiency and suppress efficiency roll-off.Meanwhile,a series of sensitizers with through-space charge transfer characteristic and high stability of blue emission,and the designing strategies of many narrowband emitters including BN-MR,BODIPY and Indolocarbazole are illustrated.In addition,the construction of white-emission devices with high performance is demonstreted.Finally,the challenges and opportunities for the future development in TSF-OLEDs are also discussed.

关 键 词：热活化敏化荧光 热活化延迟荧光 敏化剂 窄光谱染料 

分 类 号：TN383.1[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]