期刊
ORGANIC ELECTRONICS
卷 68, 期 -, 页码 113-120出版社
ELSEVIER
DOI: 10.1016/j.orgel.2019.02.001
关键词
Organic light-emitting diodes; Thermally activated delayed fluorescence; Efficiency roll-off; Small singlet-triplet splitting; High-efficiency
资金
- National Natural Science Foundation of China [61575136, 21572152, 51873139]
- National Key R&D Program of China [2016YFB0400700]
- Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of the State Administration of Foreign Experts Affairs of China
- Yunnan Provincial Research Funds on College-Enterprise Collaboration [2015IB016]
A new sky-blue thermally activated delayed fluorescent (TADF) emitter TRZ-DCF, has been developed based on 2-(9H-carbazol-9-yl) 7,7-dimethyl-5,7-dihydroindeno[2,1-b]carbazole (DCF) as donor and 2,4-diphenyl-1,3,5-triazine as acceptor. Due to the fusion of fluorene and carbazole moieties into the single carbazole donor, the multimodified emitter exhibits obvious TADF characteristics with a smaller singlet-triplet splitting (Delta(EST)) value of 0.22 eV and relatively high photoluminance quantum yield (PLQY) of 84%. As a result, a maximum external quantum efficiency (EQE) of 18.7%, a current efficiency (CE) of 39.0 cd A(-1) and a power efficiency (PE) of 30.5 lm W-1 with a Commission Internationale de L' Eclairage (CIE) coordinates of (0.18, 0.34), significantly surpassing the performance of the reference emitter 9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9H-carbazole (TRTZ), are achieved in optimal device construction. It is found that the EQE roll-off (20.8%) of TRZ-DCF is acceptable, that the efficiency drops to 14.8% at 1000 cd m(-2) in optimal device construction. These results demonstrate the multiple modifications of weak electron-donating carbazole donor is an effective way of constructing high-efficiency blue TADF emitters with small roll-off.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据