掺磷光材料有机电致发光器件的能量传递

将高量子效率的磷光材料fac-tris-2-phenylpyridine iridium(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Fo¨ster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。

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

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), Fo¨ster 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%.