掺杂PVK薄膜的荧光谱及电荷转移

Fluorescence Spectra and Charge Transfer in Doped PVK Thin Films

根据PVK掺杂后荧光谱的变化 ,说明掺杂PVK薄膜的电致发光存在着从基质分子向掺杂分子的能量传递 ,用一个由单链模型扩展到包括杂质的哈密顿量进行数值求解 ,结果表明 :在PVK和杂质分子之间有效的能量传递是源于它们之间的电荷转移 ,且随着杂质浓度的变化 ,其荧光谱峰位的移动与掺杂前后系统总能量的改变及荧光谱强度与掺杂后转移的电荷数之间分别存在对应关系。该模型较好地解释了有关的实验结果。

According to the changes of the fluorescence spectra in PVK thin films after doping, it is indicated that the energy transfer between PVK and perylene was occurred in electroluminescence of doped PVK thin films. A model Hamitonian was presented to describe the luminescence of PVD after doping. It is found that the effective energy transfer between PVK and perylene is derived form the charge transfer between them. The maximum amount of transferred charges occur at a certain dopant concentration for a given doping PVK, and the occurrence of plateau region is due to the saturation at dopant concentration. The results are in good agreement with experiments.