Visible up-conversion luminescence of CaWO 4: Er 3+,Yb 3+ and emission enhancement by tri-doping of Li + ions

Do Hwan Kim, Jeong Ho Ryu, Jun Ho Chung, Jong Won Eun, Kwang Bo Shim, Sung Yong Cho

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Abstract

Er 3+,Yb 3+ co-doped CaWO 4 polycrystalline powders were prepared by a solid-state reaction and their up-conversion (UC) luminescence properties were investigated in detail. Under 980 nm laser excitation, CaWO 4: Er 3+,Yb 3+ powder exhibited green UC emission peaks at 530 and 550 nm, which were due to the transitions of Er 3+ ( 2H 11/2)→Er 3+ ( 4I 15/2) and Er 3+ ( 4S 3/2)→Er 3+ ( 4I 15/2), respectively. Effects of Li+ tri-doping into CaWO 4: Er 3+,Yb 3+ were investigated. The introduction of Li + ions reduced the optimum calcinations temperature about 100 °C by a liquid-phase sintering process and the UC emission intensity was remarkably enhanced by Li + ions, which could be attributed to the lowering of the symmetry of the crystal field around Er 3+ ions.

Original languageEnglish
Pages (from-to)519-524
Number of pages6
JournalKorean Journal of Chemical Engineering
Volume29
Issue number4
DOIs
Publication statusPublished - 2012 Apr 1

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Keywords

  • CaWO : Er
  • Li Tri-doping
  • Solid-state Reaction Method
  • UC (Up-conversion) Luminescence
  • Yb

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