Encyclopedia of Applied Electrochemistry

2014 Edition
| Editors: Gerhard Kreysa, Ken-ichiro Ota, Robert F. Savinell

Photochromizm and Imaging

Reference work entry
First Online:
DOI: https://doi.org/10.1007/978-1-4419-6996-5_460
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Introduction

Photochromism is the reversible color changes of a material, one way or both ways of which are induced by light irradiation. In relation to electrochemistry, photoinduced charge separation gives positive and negative charges, and the former and/or the latter cause redox reactions accompanied by color changes. There are three types of electrochemical photochromism (i.e., photoelectrochromism). (1) A material absorbs light and gives rise to charge separation. It reduces (or oxidizes) itself by separated charges, resulting in a color change. It is electrochemically or chemically reoxidized (or re-reduced) (single material systems). (2) Material A absorbs light and gives charge separation. It reduces (or oxidizes) material B by separated charges and changes its color. Reduced (or oxidized) material B is electrochemically or chemically reoxidized (or re-reduced) (composite material systems). (3) Material A absorbs light of wavelength λ1and gives charge separation. It reduces...

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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Institute of Industrial ScienceUniversity of TokyoTokyoJapan