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Optical and structural investigations on Cd-S-Se-doped aluminophosphate glasses

M. ELISA1,* , C. VASILIU1, J. STRIBER1, D. RADU2, J. H. TRODAHL3, M. DALLEY3

Affiliation

  1. Department for Advanced Materials, National Institute of Optoelectronics-INOE 2000 1 Atomistilor Str., P.O.Box MG - 5, RO-77125, Magurele- Bucharest Romania
  2. Department of Science and Engineering of Oxide Materials, Faculty of Chemical Engineering, Politehnica University Bucharest, 1, Polizu Str., Bucharest, Romania
  3. Semicond.Laboratory, School of Chemical and Physical Sciences, Victoria University POBox 600, Wellington, New Zealand

Abstract

Aluminophosphate glasses doped with semiconductor CdSxSe1-x crystallites were produced by a wet non-conventional method that provides a high optical homogeneity of the glass. The samples belong to the oxide systems: Li2O-BaO-Al2O3 La2O3-SiO2-P2O5 (SDG1) and Li2O-Na2O-BaO-Al2O3-La2O3-SiO2-P2O5 (SDG2) to which we added CdS0,5Se0,5 1 % wt. (0.9 % mol.) and ZnO 1 % wt. (1.5 % mol.). The UV-VIS-NIR transmission spectroscopy revealed the shift of the transmission edge, depending on the temperature and the duration of annealing. As a general trend, the higher the temperature and the duration of the annealing process the more significant the shift of the transmission edge to higher wavelengths in the visible range. Consequently, the glass changed from colourless to red that indicates the presence of CdS0.7Se0.3 crysta lites in the vitreous phosphate matrix, as also indicated by transmission electron microscopy analysis (TEM). Raman spectra obtained by Ar+ laser excitation at 514.5 nm, showed first and second order scattering lines from CdS0.7Se0.3. The device SPIRICON LBA 300 provided information regarding the dispersal of the crystallites in the host aluminophosphate glass. Thus, by a diode laser excitation at 625 nm, we analyzed relative intensity profile of the emergent beam from the doped-glass samples and we were able to estimate the crystallites dispersal in these vitreous materials..

Keywords

Phosphate glasses, Crystallites, Semiconductors.

Submitted at: Feb. 9, 2006
Accepted at: March 23, 2006

Citation

M. ELISA, C. VASILIU, J. STRIBER, D. RADU, J. H. TRODAHL, M. DALLEY, Optical and structural investigations on Cd-S-Se-doped aluminophosphate glasses, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 811-814 (2006)