期刊
CHEMISTRY OF MATERIALS
卷 31, 期 17, 页码 6453-6464出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b04278
关键词
-
资金
- Ministry of Science and Technology (MOST)
- City University of Hong Kong
- Ministry of Education (MOE) of Taiwan
There is growing interest in the bis-tridentate Ir(III) emitters as they are expected to display both improved emission efficiency and improved photostability. Herein, we turned to the new emitters m2h-1-3 and m6h-1-3, bearing a pincer carbene ancillary and a chromophoric chelate derived from judiciously selected phenyl-pyrimidine-pyrazole entities (pzm2h(F))H-2 and (pzm6h(F))H-2, which differ in terms of the location of phenyl and pyrazole substituents on the central pyrimidine. Density functional theory calculations revealed a notable change in the spin density distribution from the pyrimidine-pyrazolate entity in m2h to the pyrimidine-phenyl fragment in m6h. As a consequence, the m6h emitters exhibited both shortened emission lifetimes and improved stabilities during extensive photolysis in solution, while corresponding organic light-emitting diodes (OLEDs) doped with green-emitting m6h-1 and sky-blue-emitting m6h-2 and m6h-3 exhibited external quantum efficiencies of 17 .6, 15.9, and 17.6%, respectively, superior to those of all of their m2h counterparts at a practical luminance of 10(3) cd/m(2). This finding suggests a new methodology for fine-tuning the electronic transition that is important to high-performance and durable phosphorescent OLEDs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据