掺磷光材料有机电致发光器件的能量传递  

Energy transfer of OLEDs made from PVK doped with fac-tris-2-phenylpyridine iridium(Ⅲ)

作　　者：杨少鹏[1] 赵方超[1] 邱晓丽[1] 秦向东[1] 王利顺[1] 居秀琴[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《应用光学》2009年第2期220-224,共5页Journal of Applied Optics

基　　金：国家自然科学基金资助项目(60678006);河北省博士基金资助项目(06547002D-4);河北省自然科学基金资助项目(E2007000196)

摘　　要：将高量子效率的磷光材料fac-tris-2-phenylpyridine iri dium(Ⅲ)(Ir(ppy)_3)按不同的比例掺杂到具有载流子传输能力的主体材料poly(N-vinylcarbazole)(PVK)中作为发光层制备磷光电致发光器件。通过对器件发光机制的研究,发现光致发光过程中起主导作用的是Foster能量转移机制;而在电致发光过程中,器件的发光性能受Dexter能量转移和电荷陷获2种能量传递形式的影响。器件的I-V-L特性表明:Ir(ppy)_3的掺杂比例为5%时,器件的光功率效率最大,能量转移最充分。The phosphorescent electroluminescent devices were developed by doping different proportions of fac-tris-2-phenylpyridine iridium （Ⅲ） （Ir（ppy）3） into PVK as a light-emitting layer. Through the research of the luminescence mechanism, it is found that in the process of photoluminescence （PL）, Foster energy transfer mechanism plays a dominant role, and in the process of electroluminescence （EL）, the two types of energy transfers as Dexter energy transfer and charge trapping affect the luminescence performance. The I-V-L characteristic of the device shows that the light-power efficiency is highest and the energy transfer is the most efficient when the doping proportion of Ir（ppy）3 is 5%.

关 键 词：有机电致发光器件 发光机制 Fster能量转移 Dexter能量转移 电荷陷获 

分 类 号：TN383.1[电子电信—物理电子学]