无溶剂热致转型制备多晶型无金属酞菁光导材料及性能研究

摘要

In this paper,a new solvent-free crystal phase transformation approach for fabrication of α-and β-form metal-free phthalocyanine(H2Pc) with good performance is reported.The cyclic condensation of 1,3-diiminoisoindoline is used to fabricate H2Pc powder,which appears α-form with low crystallinity after purification paste.According to the effect of annealing temperature on the thermal phase transformation process,α-H2Pc with 100％ crystallinity at 190 ℃ for 2 h is obtained.And β-H2Pc with 95.04％ crystallinity could be also obtained at 280 ℃ for 2 h.The morphology of H2Pc obtained in different conditions is studied,which is changed from irregular sheet structure to rodlike structure.Laser organic photoconductors doped H2Pc as the charge generation material are also prepared to detect the photoelectric performance.The α-H2Pc and β-H2Pc present the good photosensitivity with 0.609 and 0.420 pJ· cm-2,respectively.As a result,this new crystal phase transformation approach for H2Pc is simple and environmental friendly.Here,α-H2Pc and β-H2Pc with good photoconductive properties could be obtained continuously,which could be widely used in high speed laser organic photoconductor.%研究了一种新型无溶剂法进行晶型转化以获得具有良好光敏性能的α及β型无金属酞菁(H2Pc)的方法.以1,3-二亚氨基异吲哚啉缩合成环得到H2Pc,经酸糊提纯后得到低结晶度的α-H2Pc.通过对其热致转型温度的研究发现,190℃下保温2h可以得到结晶度为100％的α-H2Pc,而在高于275 cC的温度下保温2h则可以获得结晶度为95.04％的β-H2Pc.对制备的2种晶型的H2Pc的形貌进行了表征,可以观测到H2Pc逐渐由不规则片层状结构生长为棒状结构.将其作为电荷产生材料制备有机光导体器件测试其光导性能,α-H2Pc可获得0.609 μJ·cm-2的光敏性而β-H2Pc可获得0.42μJ0·cm-2的光敏性.结果表明,建立的H2Pc的晶型转化方法具有简便、环境友好、可连续制备α和β2种晶型产物,且光导性能优良的特点,可广泛应用于中高速激光有机光导体的制备.