Triplet-Polaron-Interaction-Induced Upconversion from Triplet to Singlet: a Possible Way to Obtain Highly Efficient OLEDs

被引：146
作者：
Obolda, Ablikim [1 ]
Peng, Qiming [1 ]
He, Chuanyou [1 ]
Zhang, Tian [2 ]
Ren, Jiajun [2 ]
Ma, Hongwei [1 ]
Shuai, Zhigang [2 ]
Li, Feng [1 ]
机构：
[1] Jilin Univ, Coll Chem, State Key Lab Supramol Struct & Mat, Qianjin Ave, Changchun 130012, Peoples R China
[2] Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China
来源：
ADVANCED MATERIALS | 2016年 / 28卷 / 23期
基金：
中国国家自然科学基金;
关键词：
LIGHT-EMITTING-DIODES; DELAYED FLUORESCENCE; ELECTROLUMINESCENCE; EMISSION; EXCITONS; DEVICES; ANNIHILATION; CARBAZOLE; STABILITY; CORE;
D O I：
10.1002/adma.201504601
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Two D-A-type molecules, 4-N-[4-(9-phenylcarbazole)]-3,5-bis(4-diphenyl amine)phenyl-4H -1,2,4-triazole and 4,4'-(9-(4-(1-phenyl-1H-phenanthro[9,10-d]-imidazol-2-yl)phenyl)-9H-carbazole-3,6-diyl)bis-(N,N-diphenylaniline), are designed and synthesized. Organic light-emitting diodes based on them exhibit deep-blue emission and the singlet formation ratios are higher than the simple spin-statistics of 25%. A triplet-polaron-interaction-induced upconversion from triplet to singlet through a one-electron transfer mechanism is proposed, and is proven by magnetocurrent measurement and quantum-chemistry computation.
引用
收藏
页码：4740 / 4746
页数：7
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