https://scholars.lib.ntu.edu.tw/handle/123456789/407434
標題: | Influence of pH on the formation and luminescence properties of the sol-gel derived SrAl2O4: Eu2+, Dy3+ phosphors | 作者: | Hsu C.-H. Lu C.-H. |
關鍵字: | LEDs;Luminescence;Phosphors;Sol-gel;SrAl2O4 | 公開日期: | 2009 | 卷: | 108 | 期: | 3 | 起(迄)頁: | 149-154 | 來源出版物: | Advances in Applied Ceramics | 摘要: | Europium and dysprosium ions codoped strontium aluminates (SrAl2O4: Eu2+, Dy3+) phosphors were prepared via a pH controlled sol-gel process. Monophasic SrAl2O4: Eu2+, Dy3+ phosphors were obtained after calcination at 1250¢XC. An established model based on theoretical calculations was adopted to evaluate the concentrations of strontium, aluminium, europium and dysprosium species in citric solution under different pH conditions. With increasing pH of the solutions, the extent of chelation of metal ions with citrate ligands was increased. The emission and excitation intensities both increased with a rise in pH of the prepared solution. Two broad excitation peaks peaking at 254 and 324 nm were observed in ultraviolet region. The ultraviolet excited SrAl2O4: Eu2+, Dy3+ phosphors yielded a broad band with an emission peak centred at 524 nm. The sol-gel derived SrAl2O4: Eu2+, Dy3+ phosphor is considered a promising material for application in white light emitting diodes. ? 2009 Institute of Materials, Minerals and Mining. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407434 | ISSN: | 17436753 | DOI: | 10.1179/174367608X324036 |
顯示於: | 化學工程學系 |
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