用三硝基芴酮高浓度掺杂树脂做电荷传输层的正充电有机光导体

本研究采用三硝基芴酮(TNF)高浓度掺杂的高分子树脂作为电荷传输层(CTL)、ε-CuPc的高分子分散体系作为电荷产生层(CGL)制作了电子传输型正充电有机光导体。TNF质量分数为10～50%的高分子树脂薄膜在80℃下干燥8h,再在常温下保存近半年仍然处于完全透明状态,表明该掺杂体系比较好地解决了通常TNF与高分子之间相容性差,难以实现高浓度掺杂的问题。实验结果表明这种光导体具有良好的表面电荷保持能力,在所考察的掺杂浓度范围内饱和电压一般都在+950V以上;通过调节CGL的高分子材料暗衰减速度可以控制在3.3V/s;光导体在整个可见光范围内表现出良好的感光度,特别在550、650和750nm处感光度出现峰值,在750nm处半衰曝光量为1.93μJ/cm²,在800nm处为2.8μJ/cm²。

A POSITIVELY CHARGED ORGANIC PHOTOCONDUCTIVESYSTEM BY USING HIGH CONSENTRATED TNF-DOPEDPOLYMER MATRIX AS ITS CHARGE TRANSPORT LAYER

An organic conductive system was made by using densely TNF-doped polymer matrix in its charge transport layer(CTL) and ε CuPc dispersion in its charge generation layer(CGL). Polymer films with various TNF concentrations(10～50%)remained completely transparent even after 8 h drying at 80℃ followed by nearly half year adaptation. This implies that the traditional difficulties of TNF, such as poor compatibility with traditional polymer matrix and consequently the unreality of doping at high concentration, were resolved in a good fashion. It was experimentally found that the photoreceptor has a good charge acceptance as manifested by its saturated surface potentials of ever lower than +950 V for all investigated TNF concentrations and that the dark decay can be restrained down to 3.3 V/s by adjusting the type of polymer used in CGL. The photoreceptor showed good photosensitivities in the whole visible spectrum with pronounced peaks occurring at 550, 650, and 750 nm. The half decay exposures at 750 and 820 nm were 1.93 μJ/cm² and 2.81 μJ/cm²,respectively.