High-performance non-doped blue OLEDs based on 1,2,4-triazole-phenanthroimidazole derivatives with negligible efficiency roll-off

被引：20

作者：

Cao, Wenjuan ^{[1
]}

Abdurahman, Alim ^{[1
]}

Zheng, Ping ^{[1
]}

Zhang, Ming ^{[1
]}

Li, Feng ^{[1
]}

机构：

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

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2021年 / 9卷 / 21期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

LIGHT-EMITTING-DIODES; DELAYED FLUORESCENCE; UP-CONVERSION; TRIPLET; EMISSION; EMITTERS; FLUOROPHORES; EXCITONS; SINGLET; ENERGY;

D O I：

10.1039/d1tc01079d

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Triazole and phenanthroimidazole moieties are commonly used to construct efficient blue-emitting materials as acceptors and donors, respectively. Benefitting from the D-A coupling of the two moieties, two novel bipolar blue emitters, TAZ-PPI and 4NTAZ-PPI, were synthesized. They showed excellent thermal stability and high photoluminescence quantum yields (PLQYs). Non-doped blue organic light-emitting diodes (OLEDs) based on 4NTAZ-PPI and TAZ-PPI present maximum external quantum efficiencies of 7.3% and 5.9%, respectively, and exhibit negligible efficiency roll-off. The CIE coordinates are (0.149, 0.131) and (0.149, 0.130) at a luminance of 1000 cd m(-2), respectively. Because the combination of electron donors and acceptors is a favorable method to balance the carrier injection and transport, 4NTAZ-PPI and TAZ-PPI exhibit excellent hole and electron transporting capabilities.

引用

页码：6873 / 6879

页数：7

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