Photoconductive properties of PVK-based photorefractive polymer composites doped with fluorinated styrene chromophores
作者:Eric Hendrickx、Yadong Zhang、Kyle B. Ferrio、Jon A. Herlocker、Jeff Anderson、Neal R. Armstrong、Eugene A. Mash、André P. Persoons、Nasser Peyghambarian、Bernard Kippelen
DOI:10.1039/a902745i
日期:——
We have synthesized nine anisotropic chromophores, with different degrees of fluorination, and studied the effect of the chromophore's ionization potential on charge-transfer complexation, photoconductivity, and response time in photorefractive polymer mixtures based on poly(vinylcarbazole). (2,4,7-Trinitrofluoren-9-ylidene)malononitrile (TNFDM) or C
60
provided the sensitization. We have found evidence of strong complexation between TNFDM and the chromophore. At high electric fields, the photoconductivity decays during illumination and reaches a limiting value that correlates with the chromophore's ionization potential. A buildup of C
60
–
radical anions is observed simultaneously. The strong decline in photoconductivity correlates with an increase in the photorefractive grating buildup time.
我们合成了九种具有不同氟化程度的各向异性发色团,并研究了发色团的电离电位对基于聚(乙烯基咔唑)的光折射聚合物混合物中电荷转移络合、光导率和响应时间的影响。(2,4,7-三硝基芴-9-亚基)丙二腈(TNFDM)或 C 60 提供了敏化作用。我们发现 TNFDM 与发色团之间有很强的络合作用。在高电场下,光导率会在照明过程中衰减,并达到与发色团电离电位相关的极限值。同时还观察到 C 60 - 自由基阴离子的积累。光电导率的强烈衰减与光折射光栅堆积时间的增加有关。