High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes  

作　　者：NIU QiaoLi ZHANG Yong WANG YongLi WANG Xin HE Miao 

机构地区：[1]Institute of Optoelectronic Materials and Technology,South China Normal University,LED Industrial Service Platform of Guangzhou City Guangzhou 510631,China

出　　处：《Chinese Science Bulletin》2012年第27期3639-3643,共5页

基　　金：supported by the National Natural Science Foundation of China(10904042 and 61078046);the Key Progam of Chinese Ministry of Education(210157);China Postdoctoral Science Foundation(2012M511584);the Natural Science Foundation of Guangdong Province(8251063101000007 and 10151063101000009);the Scientific and Technological Plan of Guangdong Province(2008B010200004 and 2010B010600030);the Scientific and Technological Plan of Guangzhou City(10U1-D00131)

摘　　要：Highly-efficient blue phosphorescent light-emitting diodes were fabricated based on a conjugated-polymer host by doping bis(2-(4,6-difluorophenyl)-pyridinato-N,C2') picolinate(FIrpic) into poly(9,9-dioctylfluorene)(PFO).Previously,conjugated polymers were not considered as potential hosts for blue phosphorescent dyes because of their low-lying triplet energy levels.Energy back transfer would occur and lead to poor luminescent efficiency in both photoluminescence(PL) and electroluminescence(EL) processes.However,by inserting a hole-transporting layer of poly(N-vinylcarbazole)(PVK),the energy back transfer was suppressed.At low FIrpic-doping concentrations,PFO emissions were completely quenched;with 8 wt% FIrpic,a maximum luminous efficiency of 11.5 cd/A was achieved.Highly-efficient blue phosphorescent light-emitting diodes were fabricated based on a conjugated-polymer host by doping bis（2-（4,6-difluorophenyl）-pyridinato-N,C2＇） picolinate （Flrpic） into poly（9,9-dioctylfluorene） （PFO）. Previously, conjugated polymers were not considered as potential hosts for blue phosphorescent dyes because of their low-lying triplet energy levels. Energy back transfer would occur and lead to poor luminescent efficiency in both photoluminescence （PL） and electrolumines- cence （EL） processes. However, by inserting a hole-transporting layer of poly（N-vinylcarbazole） （PVK）, the energy back transfer was suppressed. At low Flrpic-doping concentrations, PFO emissions were completely quenched; with 8 wt% Flrpic, a maximum luminous efficiency of 11.5 cd/A was achieved.

关 键 词：共轭聚合物 发光二极管 磷光 蓝色 N-乙烯基咔唑 承载 能量水平 发光效率 

分 类 号：TN312.8[电子电信—物理电子学] O631.24[理学—高分子化学]