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Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll‐Off Fabricated from Aggregation‐Induced Delayed Fluorescence Luminogens
Author(s) -
Huang Jian,
Nie Han,
Zeng Jiajie,
Zhuang Zeyan,
Gan Shifeng,
Cai Yuanjing,
Guo Jingjing,
Su ShiJian,
Zhao Zujin,
Tang Ben Zhong
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201706752
Subject(s) - oled , electroluminescence , fluorescence , exciton , optoelectronics , materials science , quenching (fluorescence) , diode , fabrication , quantum efficiency , doping , aggregation induced emission , annihilation , photochemistry , chemistry , nanotechnology , optics , physics , layer (electronics) , medicine , alternative medicine , quantum mechanics , pathology
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.