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Light absorption process in CdSxSe1-x doped aluminophosphate glass

A. STANCULESCU1,* , F. STANCULESCU2, M. ELISA3

Affiliation

  1. National Institute of Materials Physics, Bucharest, Romania
  2. University of Bucharest, Faculty of Physics, Bucharest, Romania
  3. National Institute for Optoelectronics, Bucharest, Romania

Abstract

We present a study of the effect of the crystallites composition and size on the optical properties of vitreous aluminophosphate matrix doped with CdSxSe1-x crystallites. The influences of the glass matrix composition and, heat treatment temperature and duration on the stoichiometry of the crystalline phase have been investigated by optical methods. We have studied the effect of the sodium oxide contained in the matrix, annealing temperature variation from 425 oC to 475 oC and duration variation from 2 h to 6 h on the light absorption process, evaluating an optical band gap energy between Eg=1.74 eV and Eg=2.29 eV associated with changes in the composition of the crystallites. The blue shift of the absorption edge observed in samples containing Na2O annealed at 425oC for 4 h or at 450oC for 2 h was attributed to a variation in the crystallites’ composition because their size is not favourable to the quantum confinement. We have also investigated the effect of individual CdS and CdSe clusters on the absorption properties of the aluminophosphate glass and on the process of zinc incorporation in the crystalline phase. We have made some assumptions concerning the effect of the aluminophosphate glass matrix on the direct band to band light absorption mechanism characterising the II-VI bulk semiconductor..

Keywords

Semiconductor doped glasses, Alumino-phosphate glass, Optical properties, Light absorption.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

A. STANCULESCU, F. STANCULESCU, M. ELISA, Light absorption process in CdSxSe1-x doped aluminophosphate glass, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 828-835 (2007)