Synthesis and Properties of a Novel Photosensitizer for Holographic Storage

doi:10.7517/j.issn.1674-0475.2018.03.001

Abstract

Abstract: A new green-sensitive photosensitizer PRZA was prepared for widely used 532 nm semiconductor lasers. Using another two reported green-sensitive photosensitizers (BDEA and BTCP) as references, the effect of the molecular structures of three photosensitizers on their UV-Vis absorption spectra, their initiating polymerization efficiency in free radical polymerization system and their sensitivity and imaging performance in dual curing holographic recording materials were investigated. The results showed that the absorption spectrum of PRZA had an obvious red shift due to the substitution of benzene ring with thiophene ring compared with BDEA and BTCP, resulting in a significantly improved matching performance with 532 nm light source. The molar extinction coefficient of PRZA was as large as 6.35×10⁴ L·mol^-1·cm^-1 at 532 nm. In a same prepolymer system, the three photosensitizers all showed the best initiating polymerization efficiency when their mass fractions were 0.01%. Among them, the polymerization rate and the double-bond conversion rate of prepolymers containing BTCP and PRZA were obviously better than the data of BDEA-containing one. The diffraction efficiency of samples using PRZA as photosensitizer was high as 85% with the highest sensitivity, up to 297×10^-3 cm·mJ^-1. Additionally, the sample exhibited good image storage and reproduction performance. The results proved that PRZA had a large potential in holographic storage.

Key words: green-sensitive photosensitizer, holographic storage, photopolymers, diffraction efficiency, dual curing

WANG Zhen, ZHANG Diqin, ZHAO Yu, ZHANG Yunlong, ZHAO Yuxia. Synthesis and Properties of a Novel Photosensitizer for Holographic Storage[J]. Imaging Science and Photochemistry, 2018, 36(3): 211-218.

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