Sublimable cationic iridium(iii) complexes with large steric hindrance for high-performance organic light-emitting diodes

被引：10

作者：

Liu, Ruihuan ^{[1
]}

Ma, Dongxin ^{[1
]}

Zhang, Chen ^{[1
]}

Duan, Lian ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Chem, Minist Educ, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Ctr Flexible Elect Technol, Beijing 100084, Peoples R China

来源：

DALTON TRANSACTIONS | 2019年 / 48卷 / 26期

关键词：

EFFICIENT;

D O I：

10.1039/c9dt00495e

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A series of novel sublimable cationic iridium(iii) complexes with 2-phenylquinoline as the major cyclometalated ligand and imidazole-type ancillary ligands were designed and synthesized. It is found that complexes containing active hydrogen atoms in the ancillary ligands exhibited poor electroluminescence performance. By introducing a phenyl group into the ancillary ligands to protect the active hydrogen atoms and simultaneously increase the steric hindrance of complexes, the device performance was drastically improved, due to the reduced negative effects of the active hydrogen atoms and the decreased intermolecular interaction and aggregation. We obtained high efficiency devices with a superior external quantum efficiency of 14.7%, high brightness, a low turn-on voltage of only 2.4 V and low efficiency roll-off at high luminance, the best results for yellow OLEDs based on sublimable cationic iridium(iii) complexes.

引用

页码：9669 / 9675

页数：7

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