Energy levels in YPO4:Ce3+,Sm3+ studied by thermally and optically stimulated luminescence

Adrie J.J. Bos, Nigel R.J. Poolton, Jakob Wallinga, Aurélie Bessire, Pieter Dorenbos

Research output: Contribution to journalArticleAcademicpeer-review

44 Citations (Scopus)

Abstract

Energy-resolved optically stimulated luminescence (OSL) spectra and thermoluminescence (TL) glow curves of a powder sample of YPO 4:Ce3+,Sm3+ were measured to investigate the nature of the trapping centre and to locate its energy level relative to the valence and conduction bands of the YPO4 host. The high-temperature glow peak could unequivocally be assigned to Sm2+ (thus Sm 3+ acts as an electron trap). The trap depth of this centre, as derived from the OSL excitation spectra, is in good agreement with the Dorenbos model prediction. The OSL excitation spectra also reveal excited states of Sm2+ well below the conduction band. These excited states produce a broadening of the high-temperature TL glow peak and also cause the activation energy determined by the Hoogenstraten method to underestimate the trap depth.

Original languageEnglish
Pages (from-to)343-346
Number of pages4
JournalRadiation Measurements
Volume45
Issue number3-6
DOIs
Publication statusPublished - Mar 2010
Externally publishedYes

Keywords

  • OSL excitation
  • Sm
  • Thermally assisted tunnelling
  • Thermoluminescence
  • TL
  • YPO:Ce, Sm

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