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

被引：78

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

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2018年 / 57卷 / 38期

关键词：

donor-acceptor systems; exciplexes; organic light-emitting diodes; phenylpyridinato boron; thermally activated delayed fluorescence; ACTIVATED DELAYED-FLUORESCENCE; LIGHT-EMITTING-DIODES; 4-COORDINATE ORGANOBORON COMPOUNDS; OLEDS; COMPLEXES; EMITTERS; SINGLET; PHOSPHORESCENCE; LUMINESCENCE; CONVERSION;

D O I：

10.1002/anie.201804218

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

引用

页码：12380 / 12384

页数：5

共 43 条

[41] Recent Progresses on Materials for Electrophosphorescent Organic Light-Emitting Devices [J].