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Photoluminescence and photoconductivity in lanthanide doped chemically deposited CdS-Se films

R. S. SINGH1

Affiliation

  1. Govt. College Utai, Durg – 491107, Chhattisgarh, India

Abstract

Some interesting results of photoluminescence (PL) and photoconductivity (PC) observed in chemically deposited films of lanthanide doped CdS-Se are presented in this talk. Strong PL and high photosensitization are observed at particular concentrations of the two bases. An edge emission corresponding to radiative decay of the free exciton and a broad green emission related to exciton-donor complexes formed in presence of S / excess Cd are observed in the PL emission spectra of various CdS-Se films. In doped films, characteristic emissions of lanthanides such as Ho and Sm are observed. Some properties related to nanocrystalline effects are also found. Results of optical absorption spectra also support such observations i.e. apart from host absorption, absorption due to impurities are observed. High photosensitization has also been observed under some special conditions. Results of XRD confirm the presence of CdS and CdSe. SEM studies show growth of layered structure..

Keywords

CdS-Se, Thin films, Photoluminescence, RE doping, XRD, SEM.

Submitted at: July 5, 2009
Accepted at: Dec. 10, 2009

Citation

R. S. SINGH, Photoluminescence and photoconductivity in lanthanide doped chemically deposited CdS-Se films, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 12, pp. 2115-2119 (2009)