Abstract
CuBr containing photochromic sol-gel glasses were synthesized by the introduction of CuBr dissolved in CH3CN into a sol-gel of Al2O3-SiO2 type. Microcrystals of CuBr were developed by a two step heat treatment, the first step in air initially at 280°C/2 h and then at 410°C/2 h for the removal of the organics and the second step at 700°C/2 h in nitrogen atmosphere for the reduction of the copper compounds to Cu+. Photometric measurements of the small gel pieces show a distinct darkening of 24% and a remarkable fading at room temperature of 13% within 10 minutes.
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Kriltz, A., Fachet, R., Müller, M. et al. Cuprous Halide Microcrystals Containing Photochromic Sol-Gel Glass. Journal of Sol-Gel Science and Technology 11, 197–201 (1998). https://doi.org/10.1023/A:1008653732620
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DOI: https://doi.org/10.1023/A:1008653732620