文献类型：期刊文献

英文题名：Management of exciton recombination zone and energy loss for 4CzTPN-based organic light-emitting diodes via engineering hosts

作者：Tang, Zongkai[1];Lu, Zhaoyue[1];Zheng, Yanqiong[2];Wang, Junling[3]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Shanghai Univ, Key Lab Adv Display & Syst Applicat, Minist Educ, Shanghai 200072, Peoples R China;[3]Army Acad Armored Forces, Basic Dept, Beijing 100072, Peoples R China

年份：2022

卷号：644

外文期刊名：PHYSICA B-CONDENSED MATTER

收录：;EI(收录号：20223112474341);WOS:【SCI-EXPANDED(收录号:WOS:000843884400001)】；

基金：This work was supported by the Open Fund of Key Laboratory of Advanced Display and System Applications of Ministry of Education (Shanghai University) .

语种：英文

外文关键词：Exciplex forming co-host; TADF; Efficiency roll-off; Energy transfer

摘要：The exciton recombination zone and energy loss of organic light-emitting diodes (OLEDs) with thermally acti-vated delayed fluorescence (TADF) emitter 4CzTPN (1, 2, 4, 5-Tetrakis(carbazol-9-yl)-3, 6-dicyanobenzene) as the dopant are explored by engineering hosts. The results demonstrate that the exciton recombination zone is determined by the matching condition between hole and electron mobility of hosts. The shift of the recombi-nation zone from cathode to anode side induces a blue-shift of the electroluminescent spectra. And energy loss can be reduced by well-matched carrier mobility and TADF feature of host as well as lower energy level offset between host and guest. Specifically, the exciplex-co-hosted device delivers the maximum current/power effi-ciency/external quantum efficiency of 29.06 cd.A- 1/28.89 lm.W- 1/8.86%, respectively, enhanced by more than 50% than the single-component-hosted devices. This study illuminates that controlling exciton recombination zone and energy loss via engineering hosts is a feasible strategy for developing high performance TADF OLEDs.