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Structural and optical studies on Pr3+ doped chemically deposited Cd(Se-S) films

R. S. SINGH1, S. BHUSHAN2, A. K. SINGH3

Affiliation

  1. Deptt. of Physics, Govt. D. T. College Utai, Durg-491107 (C. G.), India
  2. Shri Shankaracharya Engineering College Bhilai, Durg-490020 (C.G.), India
  3. Deptt. of Chemistry, Govt. VYT PG College Durg-491001 (C.G.), India

Abstract

Results of SEM and XRD studies, optical absorption spectra and photoluminescence (PL) emission studies are reported for Cd(Se-S):CdCl2,Pr films prepared by chemical deposition method on glass substrates at 600 C in a water bath (WB). SEM studies show ball type structure with voids which is related to layered growth. XRD studies show prominent diffraction lines of CdSe and CdS along with lines of CdCl2. The chemically deposited CdSe-S films are found to consist of two PL emission peaks, one at 494 nm and the other shifting from 516 nm to 577 nm with increasing concentration of Se. The peak at 494 nm may be attributed to the exciton bound to neutral donor levels formed by excess sulphur/Cd, and the other peak may be attributed to the radiative decay of the free exciton. The peak at 494 nm may also be due to the shift of bulk emission of CdS at 511 nm (nano-crystalline effect). In Pr doped films, a new intense peak appears at 598 nm (as compared to the PL spectra of base material), which may be related to the transitions in Pr-levels..

Keywords

Chemical bath deposition, X-ray diffraction, Energy band-gap and Photoluminescence..

Submitted at: Oct. 18, 2010
Accepted at: Nov. 19, 2010

Citation

R. S. SINGH, S. BHUSHAN, A. K. SINGH, Structural and optical studies on Pr3+ doped chemically deposited Cd(Se-S) films, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 11, pp. 2221-2225 (2010)