Nonsymmetrical Connection of Two Identical Building Blocks: Constructing Donor-Acceptor Molecules as Deep Blue Emitting Materials for Efficient Organic Emitting Diodes

被引：46

作者：

Li, Zhiqiang ^{[1
]}

Li, Chenglong ^{[1
]}

Xu, Yincai ^{[1
]}

Xie, Ning ^{[1
]}

Jiao, Xuechen ^{[2
]}

Wang, Yue ^{[1
]}

机构：

[1] Jilin Univ, State Key Lab Supramol Struct & Mat, Changchun 130012, Jilin, Peoples R China

[2] Monash Univ, Australian Synchrotron, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 04期

基金：

中国国家自然科学基金;

关键词：

ACTIVATED DELAYED FLUORESCENCE; EMISSION; EMITTERS; TRIPLET; SINGLET; OLEDS; ELECTROLUMINESCENCE; AGGREGATION; ENHANCEMENT; TRANSPORT;

D O I：

10.1021/acs.jpclett.9b00300

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：

We propose a strategy to construct deep blue emission molecules based on the concept of nonsymmetrical connection of two identical pi-conjugated groups. It was demonstrated that the nonsymmetrical connection strategy indeed resulted in the separation of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and the formation of a donor-acceptor (D-A) structure. For D-A molecules constructed by two identical groups, the degree of charge transfer is weaker and deep blue emission is easily achieved. Two D-A molecules (PIpPI and PImPI) were synthesized by employing diphenyl-phenanthroimidazole (PI) as a building block. The nonsymmetric connection of PI groups endows these molecules with a D-A feature that can result in a bipolar transport property. The nondoped organic light-emitting diodes with PIpPI and PImPI as emitter exhibit deep-blue emission and maximum external quantum efficiencies of 8.84% and 6.83%, respectively.

引用

页码：842 / 847

页数：11