High performance red phosphorescent organic electroluminescent devices with characteristic mechanisms by utilizing terbium or gadolinium complexes as sensitizers

被引：30

作者：

Cui, Rongzhen ^{[1
]}

Liu, Weiqiang ^{[1
]}

Zhou, Liang ^{[1
]}

Zhao, Xuesen ^{[1
]}

Jiang, Yunlong ^{[1
]}

Zheng, Youxuan ^{[2
]}

Zhang, Hongjie ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China

[2] Nanjing Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Adv Microstruct, State Key Lab Coordinat Chem, Nanjing 210023, Jiangsu, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2017年 / 5卷 / 08期

基金：

中国国家自然科学基金;

关键词：

LIGHT-EMITTING DEVICES; EFFICIENCY ROLL-OFF; RARE-EARTH COMPLEX; ELECTROPHOSPHORESCENCE DEVICES; TRANSPORT MATERIALS; OPERATING VOLTAGE; HOST MATERIALS; EXCITED-STATE; GREEN; OLEDS;

D O I：

10.1039/c6tc05542g

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, we demonstrated the efficacy and feasibility of utilizing terbium and gadolinium complexes with low-lying energy levels to sensitize red-emitting iridium complexes in organic light-emitting diodes (OLEDs). Compared with devices without the introduction of a sensitizer, the obtained sensitized devices showed remarkably enhanced electroluminescence performances, which can be attributed to improved carrier balance as well as a wider recombination zone. Moreover, characteristic sensitizer emission was invisible in all sensitized devices due to the inferior hole trapping ability of sensitizer molecules. Finally, the sensitized device co-doped with 0.4 wt% of the terbium complex realized superior electroluminescence performances with maximum brightness, current efficiency, power efficiency and external quantum efficiency as high as 145 071 cd m(-2), 64.87 cd A(-1), 69.11 lm W-1 and 24.7%, respectively. Meanwhile, even at the practical brightness of 1000 cd m(-2) (4.0 V), outstanding external quantum efficiency and current efficiency up to 22.7% and 59.7 cd A(-1), respectively, were obtained.

引用

页码：2066 / 2073

页数：8