Green-Yellow Electrophosphorescence from di [2,5-diphenyl-1,3,4-oxadiazole C2, N3 Platinum(II) Doped PVK Devices
LIU Jian1, ZHU Mei-Xiang1, JIANG Chang-Yun2, LIU Yu1,3, WU Zhong-Lian1, LI Jian-Ren1, XING Kong-Qiang3, CAO Yong2, ZHU Wei-Guo1
1College of Chemistry, Xiangtan University, Xiangtan 411105
2Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640
3Department of Chemistry, Qiongzhou University, Wuzhishan 572200
Green-Yellow Electrophosphorescence from di [2,5-diphenyl-1,3,4-oxadiazole C2, N3 Platinum(II) Doped PVK Devices
LIU Jian1;ZHU Mei-Xiang1;JIANG Chang-Yun2;LIU Yu1,3;WU Zhong-Lian1;LI Jian-Ren1;XING Kong-Qiang3;CAO Yong2;ZHU Wei-Guo1
1College of Chemistry, Xiangtan University, Xiangtan 411105
2Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640
3Department of Chemistry, Qiongzhou University, Wuzhishan 572200
Abstract： Employing a blend of poly (N-vinylcarbazole) (PVK) and 5-biphenyl-2-(4-tert-butyl)phenyl-1,3,4-oxadiazole) (PBD) as host matrix and a novel bicyclometalated Pt-complex containing 1,3,4-oxadiazole moiety as guest matrix with 2wt.% doping concentration, we have demonstrated efficient phosphorescence-based polymer light-emitting devices (PLEDs). The devices emitted intense green--yellow electrophosphorescence. No emission from either PVK or PBD was observed for the devices. The electroluminescence spectrum exhibited three primary peaks at 525nm, 568nm and 608nm. A maximum external quantum efficiency of 2.3% ph/el and a luminous efficiency of 3.8cd/A were achieved at a current density of 3.4mA/cm2. The results demonstrate that highly efficient electrophosphorescence can be achieved from platinum complex-based polymer light-emitting devices.
2005, Vol. 22 
