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Photoluminescence and optical absorption in CaS : Eu2+ : Sm3+ thin films

Published online by Cambridge University Press:  31 January 2011

J-G. Zhang ,
P.C. Eklund ,
Z.L. Hua ,
L.G. Salamanca-Riba ,
M. Wuttig ,
P.K. Soltani  and
G.M. Storti
J-G. Zhang
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
P.C. Eklund
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40511-8433
Z.L. Hua
Affiliation:
Materials and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742-2115
L.G. Salamanca-Riba
Affiliation:
Materials and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742-2115
M. Wuttig
Affiliation:
Materials and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742-2115
P.K. Soltani
Affiliation:
Quantex Corporation, Rockville, Maryland
G.M. Storti
Affiliation:
Quantex Corporation, Rockville, Maryland
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Abstract

The optical absorption and photoluminescence of Eu2+ : Sm3+-doped CaS films have been investigated in this paper. The energy dependence of the refractive index and absorption coefficient of the film were obtained by analyzing transmission and reflection spectra of the thin film. The refractive index at low energies is very close to the bulk value for CaS (n = 2.03) and decreases with increasing energy in the range of 1.2 to 2.5 eV. The energy gap of CaS: Eu2+ : Sm3+ thin films is found to be a direct gap with value Eg = 4.48 eV. Photoluminescence studies on annealed CaS: Eu2+ : Sm3+ thin films showed a broad band at ∼1.92 eV identified with emission from Eu2+ ions, and a set of sharp lines corresponding to emission from Sm3+ ions. Most of the strong features presented in the room temperature spectra are found in good agreement with previous bulk studies of CaS: Eu2+ and CaS: Sm3+. The abnormal increase of the Sm3+ photoluminescence with increasing temperature is explained by the phonon-assisted energy transfer from Eu2+ ions to Sm3+ ions.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 2 , February 1992 , pp. 411 - 417
Copyright
Copyright © Materials Research Society 1992

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