文献类型：期刊文献

英文题名：The Importance of Excited-State Energy Alignment for Efficient Exciplex Systems Based on a Study of Phenylpyridinato Boron Derivatives

作者：Mamada, Masashi[1,2];Tian, Guojian[3,4];Nakanotani, Hajime[1,2,5];Su, Jianhua[3,4];Adachi, Chihaya[1,2,5]

机构：[1]Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan;[2]JST, ERATO, Adachi Mol Exciton Engn Project, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan;[3]East China Univ Sci & Technol, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China;[5]Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

年份：2018

卷号：57

期号：38

起止页码：12380

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20183605788935);WOS:【SCI-EXPANDED(收录号:WOS:000444225100028)】；

基金：We thank Dr. W. J. Potscavage, Jr., for thorough and critical editing of the manuscript. This work was financially supported by JST ERATO Grant Number JPMJER1305 and JSPS KAKENHI Grant Number JP17K14531. G.T. thanks the China Scholarship Council for a scholarship.

语种：英文

外文关键词：donor-acceptor systems; exciplexes; organic light-emitting diodes; phenylpyridinato boron; thermally activated delayed fluorescence

摘要：Understanding excited-state dynamics is critical for improving the photoluminescence (PL) efficiency of exciplexes. A series of exciplexes based on conventional hole-transporting materials as donor and newly developed phenylpyridinato boron derivatives as acceptor were investigated. High PL efficiencies were achieved in only some combinations, and a large difference in performance among combinations provided insight into nonradiative processes in exciplex systems. Furthermore, the triplet local excited states ((LE)-L-3) of each donor and acceptor were found play an important role in triplet exciplex harvesting. Significant contributions from triplets were clearly observed when the charge-transfer excited states ((CT)-C-1 and (CT)-C-3) and (LE)-L-3 were ideally aligned. We also demonstrated fine control of relative energy alignment via the concentration to improve the PL efficiency.