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- Title
Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll-Off Fabricated from Aggregation-Induced Delayed Fluorescence Luminogens.
- Authors
Huang, Jian; Nie, Han; Zeng, Jiajie; Zhuang, Zeyan; Gan, Shifeng; Cai, Yuanjing; Guo, Jingjing; Su, Shi‐Jian; Zhao, Zujin; Tang, Ben Zhong
- Abstract
Purely organic emitters that can efficiently utilize triplet excitons are highly desired to cut the cost of organic light-emitting diodes (OLEDs), but most of them require complicated doping techniques for their fabrication and suffer from severe efficiency roll-off. Herein, we developed novel luminogens with weak emission and negligible delayed fluorescence in solution but strong emission with prominent delayed components upon aggregate formation, giving rise to aggregation-induced delayed fluorescence (AIDF). The concentration-caused emission quenching and exciton annihilation are well-suppressed, which leads to high emission efficiencies and efficient exciton utilization in neat films. Their nondoped OLEDs provide excellent electroluminescence efficiencies of 59.1 cd A−1, 65.7 lm W−1, and 18.4 %, and a negligible current efficiency roll-off of 1.2 % at 1000 cd m−2. Exploring AIDF luminogens for the construction of nondoped OLEDs could be a promising strategy to advance device efficiency and stability.
- Subjects
ORGANIC light emitting diodes; FABRICATION (Manufacturing); FLUORESCENCE; EXCITON theory; ANNIHILATION reactions
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 42, p13151
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201706752