Electroluminescence Performance Enhancement in Blue Polymer Light Emitting Device by Carrier Transport Balance
A series of polymer light emitting devices (PLEDs) based on the composite solid films of N-arylbenzimidazoles trimer (TPBI), poly (n-vinylcarbazole) (PVK), and a triaiylaminooxadiazole-containing tetraphenylsilane light emitting polymer (PTOA) were investigated. Electroluminescence (EL) performances were enhanced with incorporated TPBI into the light-emitting layer for the PTOA based devices. The EL performances of TPBI-PTOA based devices were further enhanced by inserting a TPBI layer into the light emitting layer and cathode interface for a better charge balance of electron and hole. Incorporating TPBI into the light-emitting layer of PVK-PTOA was not favorable for enhanced EL performances. Brightness and current efficiency reduced with increasing TPBI content for the TPBI-PVK-PTOA based devices. Similar results were obtained for devices based on the TPBI-PVK-PTOA/TPBI composite solid film bi-layer. Reduced EL performances were attributed to poor contact between the TPBI and PVK, and also the poor compatibility between the light emitting layer and the TPBI electron-transporting layer.
Polymer Light Emitting Device Triarylaminooxadiazole Tetraphenylsilane
Rong-Ho Lee Hsin-Fang Hsu
Department of Chemical Engineering, National Yunlin University of Science & Technology, Yunlin 640, Taiwan, China
国际会议
上海
英文
1364-1369
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）