Effect of reverse intersystem crossing rate to suppress efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters

被引：92
|
作者：
Inoue, Munetomo [1 ,2 ]
Serevicius, Tomas [2 ,3 ]
Nakanotani, Hajime [1 ,2 ,4 ,5 ]
Yoshida, Kou [1 ,2 ]
Matsushima, Toshinori [2 ,4 ]
Jursenas, Saulius [3 ]
Adachi, Chihaya [1 ,2 ,4 ,5 ]
机构：
[1] Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan
[2] Kyushu Univ, Ctr Organ Photon & Elect Res, Nishi Ku, Fukuoka 8190395, Japan
[3] Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, Lithuania
[4] Japan Sci & Technol Agcy JST, ERATO, Adachi Mol Exciton Engn Project, Nishi Ku, Fukuoka 8190395, Japan
[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res, Nishi Ku, Fukuoka 8190395, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2016年 / 644卷
基金：
日本学术振兴会; 日本科学技术振兴机构;
关键词：
ANNIHILATION;
D O I：
10.1016/j.cplett.2015.11.042
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Electroluminescence efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN) and 3-(9,9-dimethylacridin-10(9H)-yl)-9H-xanthen-9-one (ACRXTN) is investigated by considering intramolecular exciton relaxation processes. Electroluminescence efficiency roll-off at high current density is dramatically suppressed using ACRXTN as an emitter instead of 2CzPN because of suppressed bimolecular exciton annihilation processes such as singlet-triplet and triplet-triplet annihilation. The rate constant of reverse intersystem crossing from triplet to singlet excited states of ACRXTN is about 300 times higher than that of 2CzPN, decreasing triplet exciton density and suppressing exciton annihilation processes under optical and electrical excitation. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：62 / 67
页数：6
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