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http://dx.doi.org/10.4191/KCERS.2006.43.1.010

Luminescence Characteristics and Crystal Structure of CaWO4-Li2WO4-Eu2O3 Phosphors  

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)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.1, 2006 , pp. 10-15 More about this Journal
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
PL characteristics; Red luminescence; Crystal structure;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 J. S. Kim, J. H. Choi, C.-I. Cheon, and J. D. Byun, 'Luminescence Characteristics of $SrTiO_3$:Pr, Ga Phosphor Synthesized by Sol-Gel Process,' J. Intern. Ceram., 30 2029-31 (2004)   DOI   ScienceOn
2 R. Dafinova, K. Papazova, and A. Bojinova, 'Photoluminescence of $Eu^{3+}\;and\;SO_4\^{2-}$ Doped Tungstate System,' J. Luminescence, 75 51-5 (1997)   DOI   ScienceOn
3 K. Nassau, 'Calcium Tungstate-IV: The Theory of Coupled Substitution,' J. Phys. Chem. Solids, 24 1511-17 (1963)   DOI   ScienceOn
4 P. Porta, N. Franceschini, and G. Minelli, 'Cerium, Iron and Bismuth-Containing Molybdovanadate Solid Solution with Scheelite-Type Structure,' Mater. Chem. and Phys., 70 17-24 (2001)   DOI   ScienceOn
5 H. Horiuchi, N. Morimoto, and S. Yamaoka, 'The Crystal Structure of $Li_2WO_4$(IV) and Its Relation to the Wolframitetype Structure,' J. Sol. St. Chem., 33 115-19 (1980)   DOI   ScienceOn
6 A. H. Yahaya, Z. A. Ibrahim, and A. K. Arof, 'Thermal, Electrical and Structural Properties of $Li_2WO_4$,' J. Alloy Compounds, 241 148-52 (1996)   DOI   ScienceOn
7 Z. Lou and M. Cocivera, 'Cathodoluminescence of $CaWO_4$ and $SrWO_4$ Thin Films Prepared by Spray Pyrolysis,' Mater. Res. Bull., 37 1573-82 (2002)   DOI   ScienceOn
8 Z. Bryknar, R. Grasser, Z. Potucek, A. Scharmann, and P. Bohacek, 'Red and Near Infra-Red Luminescence of Undoped $CaWO_4$,' J. Luminescence, 72-74 643-45 (1997)   DOI   ScienceOn
9 M. V. Nazarov, D. Y. Jeon, J. H. Kang, E. J. Popovici, L. E. Muresan, M. V. Zamoryanskaya, and B. S. Tsukerblat, 'Luminescence Properties of Europium-Terbium Double Activated Calcium Tungstate Phosphor,' J. Sol. St. Chem., 131 307-11 (2004)
10 J. S. Kim, J. Z. Piao, J-H. Choi, C. I. Cheon, and J. S. Park, 'Green Light-Emitting Phosphor, $Ba_{2-x}CaMgSi_2O_8:Eu_x$(in Korean),' J. Kor. Ceram. Soc., 42 [3] 145-49 (2005)   과학기술학회마을   DOI   ScienceOn
11 K. J. Choi, J. K. Park, K. N. Kim, C. H. Kim, and H. K. Kim, 'Luminescence Characteristics of $Sr_3MgSi_2O_8$: Eu Blue Phosphor for Light Emitting Diodes(in Korean),' J. Kor. Ceram. Soc., 41 [2] 573-77 (2004)   DOI   ScienceOn
12 KRICT (Korea Research Institute of Chemical Technology), 'UV-LED and Active Light Emitting Blue Phosphor,' Korea Pat. 2003-0033864
13 F. Shi, J. Meng, Y. Ren, and Q. Su, 'Structure, Luminescence and Magnetic Properties of $AgLnW_2O_8$(Ln = Eu, Gd, Tb, and Dy) Compounds,' J. Phys. Chem. Solids, 59 105-10 (1998)   DOI   ScienceOn
14 L. Y. Luke and Chang, 'Rare Earth Substitution in Scheelite,' J. Inorganic Nuclear Chem., 31 2003-14 (1969)   DOI   ScienceOn
15 C. C. Torardi, C. Page, and L. H. Brixner, 'Structure and Luminescence of Some $CsLnW_2O_8$ Compounds,' J. Sol. St. Chem., 69 171-78 (1987)   DOI   ScienceOn
16 A. Kuzmin and J. Purans, 'Local Atomic and Electronic Structure of Tungsten Ions in $AWO_4$ Crystls of Scheelite and Wolframite Types,' Radiation Measurements, 33 583-86 (2001)   DOI   ScienceOn
17 V. Pankratov, L. Grigorjeva, D. Mil1ers, S. Chernov, and A. S. Voloshinovskii, 'Luminescence Center Excited State Absorption in Tungstates,' J. Luminescence, 94-95 427-32 (2001)   DOI   ScienceOn