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Received July 19, 2002
Accepted April 11, 2003
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Green-emitting Yttrium Silicate Phosphor Particles Prepared by Large Scale Ultrasonic Spray Pyrolysis
1Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusong-gu, Daejeon 305-600, Korea 2Department of Chemical Engineering, Yonsei University, 134, Shinchon-dong, Seodaemun-gu, Seoul 120-749,, Korea 3Department of Chemical Engineering, Yonsei University, 134, Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
Korean Journal of Chemical Engineering, September 2003, 20(5),
10.1007/BF02697301
10.1007/BF02697301
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Abstract
Tb doped Y2SiO5 phosphor particles with spherical morphology, fine size, high crystallinity and good photoluminescence intensity were prepared by spray pyrolysis. The colloidal solution obtained by adding the fumed silica particles was introduced to control the characteristics of Y2SiO5 : Tb phosphor particles. The particles prepared from the colloidal solution had a spherical and filled morphology even after post-treatment. The particles post-treated below 1,200 ℃ had X1 type crystal structure but the crystal structure changed from X1 to X2 after post-treatment above 1,300 ℃. When crystal structure was changed from X1 to X2, the PL intensity greatly increased. The maximum PL intensity of particles, which were prepared from the solution with 120% excess of stoichiometric fumed silica, was about 4 times higher than that of the particles prepared from the stoichiometric solution. The particles prepared from the stoichiometric solution of yttrium nitrate and fumed silica had mixed phases of X1 and X2 type and had impurity as Y2O3. On the other hand, the particles prepared from the solution with 120% excess of stoichiometric fumed silica had high crystallinity of X2 type.
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References
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Kang YC, Lenggoro IW, Okuyama K, Park SB, J. Electrochem. Soc., 146(3), 1227 (1999)
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Yin M, Zhang W, Xia S, Krupa JC, J. Lumin., 68, 335 (1996)
