Pure red upconversion emission from CaF2:Yb3+/Eu3+

Xiaohui Liu, Yangyang Li, Tuerxun Aidilibike, Junjie Guo, Weihua Di, Weiping Qin

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Single phase cubic CaF2 microcrystals co-doped with Eu3+ and Yb3+ ions were synthesized through a coprecipitation process followed by annealing at 1200 °C. Under the excitation of 980 nm laser, the intensive emission at ~614 nm (5D07F2) in the red region was observed at room temperature. The color coordinate of CaF2:0.1%Yb3+/0.1%Eu3+ was calculated with the Commission Internationale de I'Eclairage (CIE) chromaticity coordinate of (x=0.572, y=0.265). The excitation of Eu3+ ions came from the energy transfer of Yb3+-dimers through a cooperation sensitization process. Furthermore, not only the emissions from the 5Di (i=0, 1, 2, 3)→7Fj (j=0, 1, 2, 3) transitions but also the rarely reported emission (~398 nm) from the 5L67F0 transition was recorded. The cooperation sensitization process was so effective in the Yb3+/Eu3+ co-doped system that all the cooperative luminescence (CL) from Yb3+-clusters were quenched and only the red upconversion luminescence of Eu3+ ions could be seen.

Original languageEnglish
Pages (from-to)247-250
Number of pages4
JournalJournal of Luminescence
Volume185
DOIs
StatePublished - 1 May 2017
Externally publishedYes

Keywords

  • CIE
  • Cooperation sensitization
  • Inorganic material
  • Upconversion luminescence

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