Efficient exciplex organic light-emitting diodes with a bipolar acceptor

被引：53
作者：
Chen, Dongcheng [1 ,2 ]
Wang, Zhiheng [1 ,2 ]
Wang, Dan [1 ,2 ]
Wu, Yuan-Chun [3 ]
Lo, Chang-Cheng [3 ]
Lien, A. [3 ]
Cao, Yong [1 ,2 ]
Su, Shi-Jian [1 ,2 ]
机构：
[1] S China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
[2] S China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
[3] Shenzhen China Star Optoelect Technol Co Ltd, Shenzhen 518132, Peoples R China
来源：
ORGANIC ELECTRONICS | 2015年 / 25卷
基金：
中国国家自然科学基金;
关键词：
Organic light-emitting devices; Exciplex/electroplex; Charge transfer; Excited state; Triplet exciton; ACTIVATED DELAYED FLUORESCENCE; EMISSION; ELECTROLUMINESCENCE; DEVICES; DERIVATIVES; OLEDS; STATE;
D O I：
10.1016/j.orgel.2015.06.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Efficient exciplex organic light-emitting diodes (OLEDs) have been fabricated with an intermixed light-emitting layer comprising electron-rich m-MTDATA or TAPC as a donor and bipolar material 26DCzPPy as an acceptor. Intermolecular charge-transfer interaction between various donor materials with different highest occupied molecular orbital (HOMO) levels and 26DCzPPy are systematically investigated to explore the formation principle of the exciplex. Various techniques like steady state absorption and photoluminescence (PL) spectra, temperature dependent transient PL decay and time-resolved emission spectra (TRES) using time-correlated single-photon counting (TCSPC) principle were adopted to probe the electronic and optical properties of these exciplex systems. Strong exciplex emission was found from the m-MTDATA: 26DCzPPy and TAPC: 26DCzPPy mixed systems. The devices comprising these two exciplex systems as the emission layer exhibited a promising external quantum efficiency and a high exciton utilization efficiency due to the triplet exciton up-conversion from triplet to singlet states inspired by their small singlet-triplet exchange energy. Our current work contributes to know more about the unique intermolecular charge-transfer property between electron-rich donors and bipolar acceptors, and provides valuable exploration on developing novel high-performance exciplex OLEDs. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：79 / 84
页数：6
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