Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Luminescence Characteristics and Crystal Structure of CaWO4-Li2WO4-Eu2O3 Phosphors

CaWO4-Li2WO4-Eu2O3계 형광체의 PL 특성과 결정구조

  • Kim, Jeong-Seog (Department of Digital Display and Materials Engineering, Hoseo University) ;
  • Choi, Jin-Ho (Department of Digital Display and Materials Engineering, Hoseo University) ;
  • Jeong, Bong-Man (Electrics and Lighting Research Center, KIER) ;
  • Kang, Hyun-Ju (Research Institute of Chemical Engineering, Samcheok National University)
  • 김정석 (호서대학교 디스플레이공학과 신소재공학과) ;
  • 최진호 (호서대학교 디스플레이공학과 신소재공학과) ;
  • 정봉만 (한국에너지기술연구원 전기조명연구센터) ;
  • 강현주 (삼척대학교 화학공학과 부설연구소)
  • Published : 2006.01.01
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Abstract

Photoluminescence (PL) and crystal structures of the $(l-x)CaWO_4-xLi_2WO_4$ binary system added with $Eu_2O_3$ activator have been characterized. The $CaWO_4\;and\;Li_2WO_4$ have the scheelite and phenakite structures respectively. The $CaWO_4-Li_2WO_4-Eu_2O_3$ phosphors show the red luminescence of 613 nm peak wavelength. The wavelength range of excitation spectral band is $380\~470$ nm with the peak wavelength of 397 nm. The $0.88(0.5CaWO_4-0.5Li_2WO_4)-0.12Eu_2O_3$ showed the most superior luminescence characteristics. The effect of co-doping elements such as $Al_2O_3$ and rare-earth oxides on PL has been characterized. The co-doping elements deteriorated the luminescence intensity except the $Al_2O_3$ and $Gd_2O_3$. The PL characteristics of $CaWO_4-Li_2WO_4-Eu_2O_3$ phosphors have been compared to those of the alkali europium double molybdates (tungstates) of scheelite-related structure such as $LiEu(MoO_4)_2$ and $CsEu(MoO_4)_2$. The crystal structures of $(l-y)[(l-x)CaWO_4-xLi_2WO_4]-yEu_2O_3$ phosphors have been characterized using XRD data and rietveld refinement.

Keywords

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