On the luminescence enhancement of Mn2+ by co-doping of Eu 2+ in ZnS:Mn,Eu

Marius Hossu, Roger O. Schaeffer, Lun Ma, Wei Chen*, Yongbin Zhu, Ramaswami Sammynaiken, Alan G. Joly

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The photoluminescence and X-ray luminescence of ZnS:Mn, ZnS:Mn,Eu and ZnS:Eu were investigated and it was found that the luminescence intensity of Mn2+ in ZnS:Mn,Eu co-doped phosphors is highly dependent on the doping concentration of Eu2+. At the optimized Eu2+ concentration (0.2%), the photoluminescence of Mn2+ shows about a 5.5 times enhancement and its X-ray luminescence is enhanced by a factor of 2.5. Both wurtzite and zinc blend phases are present in the samples with wurtzite phase dominant. Co-doping of Eu2+ into ZnS:Mn does not change appreciably the ratio of the two phases or the Mn2+ emission luminescence lifetime; however, the doping of Eu2+ into ZnS:Mn does change the phonon activity. Furthermore, it was found that the defect-related blue emission of ZnS:Eu overlaps with the excitation bands of Mn2+ in ZnS:Mn and there is likely energy transfer from these defect states to Mn 2+ in ZnS:Mn,Eu. This energy transfer and the phonon modification are considered to be the two main reasons for the luminescence enhancement and the intensity dependence of Mn2+ emission on Eu2+ doping concentration in ZnS:Mn,Eu.

Original languageEnglish
Pages (from-to)1513-1519
Number of pages7
JournalOptical Materials
Volume35
Issue number8
DOIs
Publication statusPublished - Jun 2013
Externally publishedYes

Keywords

  • Energy transfer
  • Eu
  • Mn
  • Photoluminescence
  • X-ray luminescence
  • ZnS

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