Enhanced ultraviolet upconversion in YF3:Yb3+/Tm3+ nanocrystals

Guofeng WANG, Weiping QIN, Lili WANG, Guodong WEI, Peifen ZHU, Daisheng ZHANG, Fuheng DING

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF3:Yb3+(20%)/Tm3+(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (1I63H6, 1I63F4, and 1D23H6) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion luminescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω2, which precluded the transition rate from 3F2 to 3F4, enhanced the energy transfer process and populated the 1D2 level: 3F23H6 (Tm3+): 3H41D2 (Tm3+).

Original languageEnglish
Pages (from-to)330-333
Number of pages4
JournalJournal of Rare Earths
Volume27
Issue number2
DOIs
StatePublished - Apr 2009
Externally publishedYes

Keywords

  • Judd-Ofelt parameter
  • nanocrystals
  • rare earths
  • upconversion luminescence

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