Competing roles of defects in SrAl2O4:Eu2+,Dy3+ phosphors detected by luminescence techniques

Y. Wang, M. Cui, Y. Zhao, Z. G. Xia, A. A. Finch, P. D. Townsend

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Thermoluminescence (TL) and radioluminescence (RL) spectra of the long-lasting phosphorescence of SrA12O4:Eu2+,Dy3+ with A1N addition and commercially used SrA12O4:Eu2+,Dy3+ were compared. Their spectra were slowly recorded over the temperature range from 25 to 673 K (400 °C). A1N offers a higher temperature TL peak, which should lengthen the phosphor lifetime. However, both TL and RL, especially that below room temperature, reveal that there are additional decay paths for the samples of SrA12O4:Eu2+,Dy3+ with A1N additions. These new defect sites reduce the phosphor efficiency. Some speculative models of potential sites are proposed and discussed. In addition, discontinuous intensity changes have been observed for both sample types in TL and RL spectra, which are assigned to the transitions of embedded impurity phases. The justification for this model is explained. Suggestions for future experimentation are also considered.
Original languageEnglish
Pages (from-to)1403-1412
Number of pages10
JournalJournal of Materials Research
Volume31
Issue number10
Early online date26 May 2016
DOIs
Publication statusPublished - 28 May 2016

Keywords

  • Defects
  • Dopant
  • Luminescence

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