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Preparation and luminescent properties of SrS:Ce by addition of sulphur as a co-activator in SrSO4:Ce(SO4)2.4H2O by carbothermal reduction.

Published online by Cambridge University Press:  26 February 2011

P. Thiyagarajan ,
M. Kottaisamy ,
K. Sethupathi  and
M. S. R. Rao
P. Thiyagarajan
Affiliation:
Department of Physics, Indian Institute of Technology-Madras, Chennai – 600 036 Materials Science Research Centre, Indian Institute of Technology, Chennai – 600 036
M. Kottaisamy
Affiliation:
Materials Science Research Centre, Indian Institute of Technology, Chennai – 600 036
K. Sethupathi
Affiliation:
Department of Physics, Indian Institute of Technology-Madras, Chennai – 600 036
M. S. R. Rao
Affiliation:
Department of Physics, Indian Institute of Technology-Madras, Chennai – 600 036 Materials Science Research Centre, Indian Institute of Technology, Chennai – 600 036
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Abstract

Ce activated SrS has been prepared from SrSO4:Ce(SO4)2.4H2O by ecologically acceptable carbothermal reduction in the absence of inert gas and hazardous H2S environment. The mixtures were fired at 900°C to find out the feasibility of the reduction reaction. In order to understand the compensator behavior we tried with sulfur and various fluxes viz., NH4Cl, NaCl. The materials synthesized were characterized by XRD, photoluminescence emission (PL) and excitation spectroscopy (PLE) and SEM. The characterization results showed the formation of SrS at 900°C with an increase in luminescence intensity after the addition of sulfur as a co-activator. The bright blue-green emission observed at 480nm and 540nm corresponds to energy bands originating from 2T2g (5d) to 2F7/2, 2F5/2(4f) of Ce3+ transitions. The excitation spectrum shows a fundamental absorption of SrS host crystal lattice in the lower wavelength region at 283 nm and Ce at 430 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 829: Symposium B – Progress in Compound Semiconductor Materials IV – Electronic and Optoelectronic Applications , 2004 , B2.33
Copyright
Copyright © Materials Research Society 2005

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References

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