A New Solvent-Free Preparation Approach for Polymouphous Metal-Free Phthalocyanine Photoconductive Materials and Their Performances

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Abstract

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 μJ·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.

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	Pu Bingye
	Li Xianggao
	Wang Shirong
	Xiao Yin
	Li Zhanqiang
	Chen Yufu

Keywords： thermal-induction； crystal phase transitions； solvent-free； photoconductivity； metal-free phthalocyanine

Received 2015-04-13;

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Pu Bingye, Li Xianggao, Wang Shirong, Xiao Yin, Li Zhanqiang, Chen Yufu.A New Solvent-Free Preparation Approach for Polymouphous Metal-Free Phthalocyanine Photoconductive Materials and Their Performances[J] Chemcial Industry and Engineering, 2017,V34(3): 1-7

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