Highly Efficient Electrophosphorescence from a Grafted Biscyclometalated Iridium Complex with Triarylamine Unit in Polymer Light-Emitting Devices

ZHU Mei-Xiang; ZHU Wei-Guo; WU Zhong-Lian; JIANG Chang-Yun; LIU Jian; LI Jian-Ren; XING Kong-Qiang; YANG Yu-Ping; GAN Quan; CAO Yong

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Highly Efficient Electrophosphorescence from a Grafted Biscyclometalated Iridium Complex with Triarylamine Unit in Polymer Light-Emitting Devices

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@@ The electroluminescence performance from a novel grafted cyclometalated iridium complex (BuPhNPPy)2Ir(acac)with triarylmine unit, where BuPhNPPy is N,N-di(4-tert-butylphenyl)-4-(2-pyridyl) phenylamine and Hacac is acetylacetone, is demonstrated in the double-layered polymer light-emitting devices (PLEDs). The PLEDs emit intense green phosphorescence at 533 nm with a shoulder peak of 566 nm employing 4 wt. % (BuPhNPPy)2 Ir(acac)doped a blend of poly(vinylcarbazole) (PVK) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD) as the emitting layer. A maximum luminance of 14610cd/m2 at voltage of 24 V and a maximum external quantum efficiency Eext of 10.4% photons per electron (ph/el) at current density of 32mA/cm2 are achieved. When the current density is raised to 100mA/cm2, Eext of the device still remained to 8.3% ph/el. This indicates that the triplet-triplet annihilation is restrained more effectively at high current density. The improvement of electrophosphorescence performances of the iridium complex may be contributed to an ortho-substituent effect of grafted triarylmine unit.

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《中国物理快报：英文版》 |2005年第7期|1793-1796|共4页
作者
ZHU Mei-Xiang; ZHU Wei-Guo; WU Zhong-Lian; JIANG Chang-Yun; LIU Jian; LI Jian-Ren; XING Kong-Qiang; YANG Yu-Ping; GAN Quan; CAO Yong;
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College of Chemistry, Xiangtan University, Xiangtan 411105;

College of Chemistry, Xiangtan University, Xiangtan 411105;

IPOMD, South China University of Technology, Guangzhou 510640;

College of Chemistry, Xiangtan University, Xiangtan 411105;

College of Chemistry, Xiangtan University, Xiangtan 411105;

Department of Chemistry, Qiongzhou University, Wuzhishan 572200;

College of Chemistry, Xiangtan University, Xiangtan 411105;

College of Chemistry, Xiangtan University, Xiangtan 411105;

IPOMD, South China University of Technology, Guangzhou 510640;

College of Chemistry, Xiangtan University, Xiangtan 411105;

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Highly Efficient Electrophosphorescence from a Grafted Biscyclometalated Iridium Complex with Triarylamine Unit in Polymer Light-Emitting Devices

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