不同发光层基质材料的高效红色有机电致磷光器件  

High-efficiency Red Organic Electrophosphorescence Devices with Different Host of Light-emitting Layer

作　　者：张晓波[1] 委福祥[1] 曹进[1] 朱文清[1] 蒋雪茵[1] 张志林[1] 许少鸿[1] 

机构地区：[1]上海大学材料学院,上海嘉定201800

出　　处：《半导体光电》2005年第6期508-511,548,共5页Semiconductor Optoelectronics

基　　金：国家自然科学基金重点项目(90201034);国家"863"计划资助项目(2001AA313070);上海光科技资助项目(012261055)

摘　　要：制备了以铱配合物(btp)2Ir(acac)磷光体为掺杂剂,分别以TPB i、CBP和A lq为发光层基质的红色电致磷光器件,比较了三种器件的性能。结果表明,在三种器件中,以A lq为基质的器件效率极低;以CBP为基质的器件,高的效率和好的色度相互矛盾;以TPB i为基质的器件性能最好,在驱动电流为4 mA/cm2时,色坐标为(x=0.62,y=0.35),亮度效率达2.43 cd/A。分析表明,(btp)2Ir(acac)分子在TPB i基质中的高效发光源于其对空穴的有效俘获。进一步的研究确定,(btp)2Ir(acac)分子在TPB i基质中的激子扩散长度为20 nm左右。The devices with a red phosphorescent dye （btp）zlr（acac） as a dopant in three kinds of hosts were constructed. Three kinds of host are TPBi, CBP and Alq, respectively. The device structure is ITO/CuPc/NPB/host： （btp）2Ir（acac）/ TPBi/AIq/LiF/AI. In these devices, the cell based on Alq has a poor efficiency, and the efficiency and color purity are contradictive in CBP-based device, while the cell based on TPBi has a better performance. At the CIE coordinates （x=0.62,y=0. 35）,efficiency of 2.43 cd /A has been achieved at 4 mA/cmz. It was suggested that high-efficiency phosphorescence in TPBi-based device came from efficient trapping of holes of （btp）2 Ir（acac）. It was also demonstrated that the exciton diffuse length of （btp）2 Ir（acac） in TPBi host was about 20 nm.

关 键 词：三线态激子 基质 有机电致磷光 T—T湮没 

分 类 号：TN873.3[电子电信—信息与通信工程]