影像科学与光化学2012，Vol.30Issue(6)：411-419,9.
磷光客体三重态能级对基于PVK主体的电致发光器件的影响
Effects of Triplet Energy Levels of Phosphorescent Guests on Luminescent Efficiency of PVK Based Polymeric Light-Emitting Diodes
摘要
Abstract
Doping phosphorescent guests to PVK and PBD matrix is an effective method to a-chieve high-efficiency phosphorescent polymeric light-emitting diodes (PhPLED). However, by doping Ir(pppy)3, Ir(F-pppy)3 and Ir(F2-pppy)3 to the PVK and PBD matrix, great difference of the device properties have been observed. In order to investigate the reasons for these phenomena, we use steady- and time-resolved-spectroscopy to study the effect of energy transfer from host to guest and direct electron and hole trapping mechanisms on the light-emitting properties of the active layers. The experimental results show that the balanced carrier injection and high efficient charge trapping are important mechanisms for obtaining high-efficiency PhPLEDs with PVK as the host. PVK does not fit blue PhPLED preparation because of its lower triplet energy level. Doping PBD to PVK host will further decrease the triplet energy level of the host. Our work provides important photophysical basis for the design of the phosphorescent hosts and the PhPLED device.关键词
高分子电致发光器件/磷光电致发光/时间分辨光谱/主-客体能量转移/电荷捕获Key words
polymeric light-emitting diodes/electrophosphorescence/time resolved spectrosco-py/energy transfer/charge trapping分类
化学化工引用本文复制引用
刘红梅,尹名,汪鹏飞,何鉴,张晓宏,张新平..磷光客体三重态能级对基于PVK主体的电致发光器件的影响[J].影像科学与光化学,2012,30(6):411-419,9.基金项目
国家自然科学基金(11074018,11104007). （11074018,11104007）
