TiOPc/VOTPP复合光生材料在近红外光区光敏性协同增强的机理

Synergetic enhancement mechanism of TiOPc/VOTPP charge generation composite material in the infra-red region

在光致放电研究中发现酞菁氧钛(TiOPc)/四苯基卟啉氧钒(VOTPP)复合光生材料在近红外光照射下表现出明显的光敏性协同增强现象。从TiOPc和VOTPP的电子结构推断:由于VOTPP的电离势(Ip)低于TiOPc而高于传输材料BAH,因此当复合材料被762.5nm的光激发时可以发生从VOTPP到TiOPc的电荷转移,VOTPP发挥了从光生材料到传输材料的电荷转移中介作用。据此提出了复合光生材料光敏性协同增强的Ip判据,这个判据得到氯化酞菁铟/VOTPP与氯化酞菁铝/VOTPP复合光生材料光致放电实验的支持。

A synergetic enhancement in photosensitivity of TiOPc/VOTPP composite photogeneration materials was found by photoinduced xerographic discharge experiment under the illumination of infrared light. According to the electronic structure of TiOPc and VOTPP, we argued that the process of charge transfer from VOTPP to TiOPc was stimulated by the light of 762.5nm and the VOTPP molecules played the role of mediate of charge transfer between charge generation and charge transporting materials, because the ionization potential (Ip) of VOTPP was lower than that of TiOPc but higher than that of charge transport material BAH. We brought forward a criterion of Ip to estimate the existence of synergetic enhancement effect of photosensitivity in composite charge generation materials, it was confirmed by the photoinduced xerographic discharge experiments on composites of chloroindium phthalocyanine/VOTPP and chloroaluminum phthalocyanine/VOTPP. 