Some Perspectives On Electrochromic Device Research

S. K. Deb

doi:10.1117/12.936663

23 February 1987 Some Perspectives On Electrochromic Device Research

S. K. Deb

Proceedings Volume 0692, Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology; (1987) https://doi.org/10.1117/12.936663
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

The electrochromic phenomenon consists of changing the optical absorption properties of certain materials by an externally applied electric field or current. In the unactivated state, these materials do not absorb in the visible range of the spectrum and hence they are colorless. However, on applying a moderate DC electric field, the material develops an absorption band in the visible region which results in a color change. The coloration remains for various lengths of time even after the external field is removed. The system returns to its original state when the polarity of the external field is reversed. Consequently this basic phenomenon can he utilized for a great variety of technologically important applications such as light modulation, display devices, optical information recording, electrophotography, and the like. The term "electrochromism" can he applied to a broad range of phenomena in which any kind of color change is brought about by an electric field or a current in a solid or semi-solid system. A great deal of interest in this type of phenomenon arose primarily as a result of an observation that large densities of color-centers can be generated in a controlled and reversible manner in thin films of certain transition metal oxides, such as W03, Mo03, etc., which are ordinarily large band gap insulators. In this paper we will present some historical perspectives on this effect and assess, to a limited extent, the current status of this technology.

Citation Download Citation

S. K. Deb "Some Perspectives On Electrochromic Device Research", Proc. SPIE 0692, Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology, (23 February 1987); https://doi.org/10.1117/12.936663

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