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Trapping and Luminescence Mechanism Studies in SrS:Eu2+, Sm3+ Thin Films at Various Temperatures

Published online by Cambridge University Press:  25 February 2011

Susan Z. Hua ,
L. Salamanca-Riba ,
M. Wuttig  and
P. K. Soltani
Susan Z. Hua
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742–2115
L. Salamanca-Riba
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742–2115
M. Wuttig
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742–2115
P. K. Soltani
Affiliation:
Quantex Corporation, Rockville, MD 20850
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Abstract

The temperature dependence of photoluminescence in SrS singly and doubly doped with Eu2+, Sm3+ was studied with different excitation energies. Different energy transfer mechanisms, namely, phonon-assisted energy transfer and electron transfer through energy bands, depending on the excitation energy, are proposed to take place in SrS:Eu2+, Sm3+ thin films. We estimate that under UV light excitation 10% of Eu2+ emission originates from electronic transitions between Eu2+ and Sm3+ through the conduction and valance bands. In contrast, direct inter-ionic transitions take place for 2.84 eV excitation energy via a phonon assistance mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 281: Symposium D – Semiconductor Heterostructures for Photonic and Electronic Applications , 1992 , 597
Copyright
Copyright © Materials Research Society 1993

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References

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