- Effect of Solution Properties on Luminance Characteristics of YAG:Ce Phosphors Prepared by Spray Pyrolysis
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You-Mi Lee, Tae-Won Kang, Kyeong-Youl Jung
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J Korean Powder Metall Inst. 2012;19(3):220-225.
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DOI: https://doi.org/10.4150/KPMI.2012.19.3.220
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 Abstract
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- YAG:Ce yellow phosphor particles were synthesized by spray pyrolysis with changing the solution properties and their luminous properties, crystal structure, and morphological changes were studied by using PL measurement, XRD, and SEM analysis. It was clear that the solution properties significantly affected the crystal phase, crystallite size, the PL intensity, and the morphology of YAG:Ce particles. At low calcination temperature, the addition of urea only to the spray solution was helpful to form a pure YAG phase without any impurity phases, as the result, the highest luminescence intensity was achieved at the calcination temperature of 900°C. When the calcination temperatures were larger than 1300°C, however, the YAG particles prepared without any additive showed the highest luminescent intensity. Regardless of the solution conditions, the emission intensity of YAG:Ce particles prepared by spray pyrolysis showed a linear relation with the crystallite size. In terms of the morphology of YAG:Ce particles, the addition of both DCCA and NH_4OH to the spray solution was effective to prepare a spherical and dense structured YAG particles.
- Luminescent Properties of Y2O3:Eu Red Phosphor Particles Prepared by Microwave Synthesis
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Meriel Chua Maniquiz, Tae-Won Kang, Jin-Han Ahn, Kyeong-Youl Jung
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J Korean Powder Metall Inst. 2009;16(3):203-208.
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DOI: https://doi.org/10.4150/KPMI.2009.16.3.203
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Abstract
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- Y_2O_3:Eu red phosphor was prepared by microwave synthesis. The crystal phase, particle morphology, and luminescent properties were characterized by XRD, SEM, and spectrofluorometer, respectively. The prepared Y_2O_3:Eu particles had good crystallinity and strong red emission under ultravioletet excitation. The crystallite size increased with calcination temperature and satuarated at 1200°C. The primary particle size initially formed was varied from 30 to 450 nm with microwave-irradiation (MI) time. It was found that the emission intensity of Y_2O_3:Eu phosphor strongly depends on the MI time. In terms of the emission intensity, it was recommended that the MI time should be less than 15 min. The emission intensity of Y_2O_3:Eu phosphor prepared by microwave syntehsis strongly depended on the crystallite size of which an optimal size range was 50-60 nm.
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