Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll‐Off Fabricated from Aggregation‐Induced Delayed Fluorescence Luminogens

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 lumin...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2017-10, Vol.56 (42), p.12971-12976
Main Authors: Huang, Jian, Nie, Han, Zeng, Jiajie, Zhuang, Zeyan, Gan, Shifeng, Cai, Yuanjing, Guo, Jingjing, Su, Shi‐Jian, Zhao, Zujin, Tang, Ben Zhong
Format: Article
Language:English
Subjects:
Agglomeration
aggregation-induced emission
Current efficiency
delayed fluorescence
Diodes
Efficiency
Electroluminescence
Emission
Emitters
exciton utilization
Excitons
Fabrication
Fluorescence
luminogens
Organic light emitting diodes
Quenching
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Summary: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. Neat films of luminogens with aggregation‐induced delayed fluorescence (AIDF) were employed in nondoped OLEDs. These systems afford remarkable current, power, and external quantum efficiencies as the concentration‐caused emission quenching and exciton annihilation are well suppressed, which leads to high emission efficiencies and efficient exciton utilization in the neat films.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201706752