"Doughnut-shaped" Coloration of V2O5 upon Laser Irradiation: Another Evidence of Visible Light Photochromism of V2O5

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Published 1 September 2003 • Copyright (c) 2003 The Japan Society of Applied Physics
, , Citation Shigeru Nishio et al 2003 Jpn. J. Appl. Phys. 42 5670 DOI 10.1143/JJAP.42.5670

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1 The Wakasa Wan Energy Research Center, 64-52-1 Nagatani, Tsuruga, Fukui 914-0192, Japan

2 Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan

3 Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan

Dates

  1. Received 15 April 2003
  2. Accepted 2 June 2003
  3. Published

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Abstract

This short note provides proof of the visible light photochromism of polycrystalline V2O5 using much simpler method than that in a previous report [S. Nishio and M. Kakihana: Chem. Mater. 14 (2002) 3730]. It was found that the "doughnut-shaped" coloration in polycrystalline V2O5 samples is formed around a direct laser spot upon visible laser irradiation; that is, the depth of coloration attains its maximum with increasing laser power. This effect can be a consequence of light and heat having opposite actions (coloration and bleaching, respectively) on polycrystalline V2O5. The result is clear evidence of photochromism based on the definition of the term.

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10.1143/JJAP.42.5670