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J. Korean Ceram. Soc. > Volume 43(1); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(1): 10.
doi: https://doi.org/10.4191/kcers.2006.43.1.010
CaWO4-Li2WO4-Eu2O3계 형광체의 PL 특성과 결정구조
김정석, 최진호, 정봉만1, 강현주2
호서대학교 디스플레이공학과 신소재공학과
1한국에너지기술연구원 전기조명연구센터
2삼척대학교 화학공학과 부설연구소
Luminescence Characteristics and Crystal Structure of CaWO4-Li2WO4-Eu2O3 Phosphors
Jeong-Seog Kim, Jin-Ho Choi, Bong-Man Jeong1, Hyun-Ju Kang2
Department of Digital Display and Materials Engineering, Hoseo University
1Electrics and Lighting Research Center, KIER
2Research Institute of Chemical Engineering, Samcheok National University
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.
Key words: PL characteristics, Red luminescence, Crystal structure
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