Refraction index and oscillator strength in MoO3 photocolored films

Citation
Mn. Mondragon et al., Refraction index and oscillator strength in MoO3 photocolored films, PHYSICA B, 271(1-4), 1999, pp. 369-373
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
0921-4526 → ACNP
Volume
271
Issue
1-4
Year of publication
1999
Pages
369 - 373
Database
ISI
SICI code
0921-4526(199911)271:1-4<369:RIAOSI>2.0.ZU;2-T
Abstract
Amorphous MoO3 films were grown onto glass substrates by the thermal evapor ation technique. Color centers in the films were generated by UV-VIS light irradiation (photochromism) in air at room temperature. As-grown films look ed pale yellowish to naked eye and acquired a bluish tone after the colorat ion process. Refraction index and extinction coefficient were calculated on as-grown and colored samples by using macroscopic optical differential ref lectance measurements fitted with the transfer matrix theoretical model. Th e coloration efficiency parameter and the refraction index values of MoO3 f ilms allowed us to calculate the oscillator strength (f) value equal to 0.2 2 +/- 0.02 by means of the optical absorption spectra. This value was obtai ned by fitting the experimental results to an optional expression of Smakul a's formula, derived from a semi-classical theoretical model. (C) 1999 Else vier Science B.V. All rights reserved.