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Influence of Pressure on 5d → 4f Emission Transitions of Ce3+

Published online by Cambridge University Press:  21 March 2011

Garry B. Cunningham ,
Yongrong Shen ,
Kevin L. Bray  and
Ulisses R. Rodriguez Mendoza
Garry B. Cunningham
Affiliation:
Department of Chemistry, Washington State University, Pullman, WA 99164-4630
Yongrong Shen
Affiliation:
Department of Chemistry, Washington State University, Pullman, WA 99164-4630
Kevin L. Bray
Affiliation:
Department of Chemistry, Washington State University, Pullman, WA 99164-4630
Ulisses R. Rodriguez Mendoza
Affiliation:
Departmento de Fisica Fundamental y Experimental, Universidad de La Laguna, S/C de Tenerife, Spain
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Abstract

High pressure is used to tune the emission and band structure of the phosphors Ce3+:Lu2S3 and Ce3+:Lu2SiO5. A significant red shift of the broad 5d → 4f emission of Ce3+ was observed in both phosphors. In Ce3+:Lu2S3, we also observed a significant decrease in the emission intensity of Ce3+ and attribute the quenching to a pressure-induced electronic crossover of the Lu2S3 conduction bandedge with the emitting 5d state of Ce3+. In Ce3+:Lu2SiO5, two Ce3+ sites are present and we observed energy transfer from one site (Ce(2)) to the other (Ce(1)) at low pressure. At high pressure, the energy transfer ceases and emission is no longer observed from the Ce(1) site. We propose an exciton recombination model of the energy transfer process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 667: Symposium G – Luminescence and Luminescent Materials , 2001 , G2.9
Copyright
Copyright © Materials Research Society 2001

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References

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