Photochromic glass thin film formed by the sol-gel coating method

Hiroyuki Nakazumi; Rie Nagashiro; Shinya Matsumoto; Kakuzoh Isagawa

doi:10.1117/12.188974

13 October 1994 Photochromic glass thin film formed by the sol-gel coating method

Hiroyuki Nakazumi, Rie Nagashiro, Shinya Matsumoto, Kakuzoh Isagawa

Proceedings Volume 2288, Sol-Gel Optics III; (1994) https://doi.org/10.1117/12.188974
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The photochromic gel thin films using 1'-butyl-3',3'-dimethyl-6-nitro-spiro[2H-1- benzopyran-2,2'-indoline] (1) and 1'-butyl-spiro[2H-indole-2,3'- [3H]naphtho[2,1-b][1,4]oxazine] (2) dispersed in sol in the sol-gel processing were prepared and photochromic behaviors of these films were investigated. A good transparent coating layer on glass surface was formed in the range of ca. 6 - 10 wt% of 1 or 2 to alkoxysilane, and was colored by UV irradiation. The absorption band formed by UV-irradiation disappeared by thermal decay and also by Vis irradiation for 1. The thermal fading of the colored form to the spiro form 1 or 2 is dependent on a matrix of the gels, the colored forms in the film starting from methyltriethoxysilane (MTES), which is expected to include larger pores than in the film starting from tetraethoxysilane (TEOS) or silane oligomer, show faster thermal fading which roughly follows the first order kinetics. The colored form in the gel is stabilized, compared with that in solution or bulk gel, and it is suggested that there are some kinds of colored species in thin gel films containing spiropyran 1, which may be some aggregates, whereas only a colored species from spironaphthooxazine 2 is suggested. Photochromic behavior of 2 in sol was also examined.

Citation Download Citation

Hiroyuki Nakazumi, Rie Nagashiro, Shinya Matsumoto, and Kakuzoh Isagawa "Photochromic glass thin film formed by the sol-gel coating method", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); https://doi.org/10.1117/12.188974

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