Luminescence enhancement of Eu-doped calcium magnesium silicate blue phosphor for UV-LED application |
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Authors: | Kyeong Youl Jung Joo Hyun Kim |
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Institution: | a Department of Chemical Engineering, Kongju National University, 182 Shinkwan-dong, Kongju, Chungnam 314-701, Republic of Korea b Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea |
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Abstract: | (Ca1−x,Eux)MgSi2yO6+δ blue phosphor was prepared by spray pyrolysis and the photoluminescence properties were optimized by controlling concentration of Si element and the activator content. At y=1.0, the concentration quenching in the luminescent intensity appeared when the Eu2+ content (x) was 0.01 (1 at%). Such quenching concentration was changed with the concentration of silicon (y), which was increased with an increase in the quantity of excess Si (y>1.0). The highest luminescent intensity was achieved when the Eu2+ content (x) and the Si concentration (y) were 0.04 and 1.3, respectively. According to X-ray diffraction (XRD) analysis, the tetragonal SiO2 phase was formed as a minor phase when the y value was larger than 1.3. The formation of SiO2 phase, however, did not reduce but increased the luminescent intensity when the Eu2+ content was optimized again. As a result, the luminescent intensity of the phosphor particles optimized in the content of both Si and Eu2+ was about 150% improved compared with that of the CaMgSi2O6:Eu sample (x=0.01, y=1.0). |
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Keywords: | Phosphor Calcium magnesium silicate Luminescence LED |
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