Author： Marquet H. Gies J.-G. Merle J.-C.
Publisher： Edp Sciences
E-ISSN： 1286-4854|46|3|389-394
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.46, Iss.3, 2010-03, pp. : 389-394
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Abstract
A close correlation between thermally stimulated conductivity and thermally bleached photochromism experiments allows us to propose a charge transfer mechanism: free electrons are generated by an appropriate illumination, which either ionizes deep donor centres or creates band-to-band transitions. These electrons are trapped on shallow levels. Three of them act as reservoirs and in turn populate a deeper level which constitutes the fundamental state of the photochromic transitions. The model well explains the variation of the magnitude of the photochromism under variable optical excitation and de-excitation as well as its thermal stability.
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