https://scholars.lib.ntu.edu.tw/handle/123456789/407427
標題: | Synthesis and photoluminescent characteristics of Sr2CeO4 phosphors prepared via a microwave-assisted solvothermal process | 作者: | Lu C.-H. Wu T.-Y. Hsu C.-H. |
關鍵字: | Microwave;Phosphors;Solvothermal synthesis;Sr2CeO4 | 公開日期: | 2010 | 卷: | 130 | 期: | 5 | 起(迄)頁: | 737-742 | 來源出版物: | Journal of Luminescence | 摘要: | Blue-light emitting Sr2CeO4 phosphors were successfully prepared via a microwave-assisted solvothermal method employing ethylene glycol as a solvent. The formation of Sr2CeO4 phase began when the solvothermally derived precursors were heated at 800 ¢XC. With increase in heating temperatures, significantly enhanced excitation and emission intensities were observed because of an increase in the amount of Sr2CeO4. Heating at 1200 ¢XC led to a substantial decrease in mission intensity due to thermal decomposition of Sr2CeO4 at elevated temperatures. The solvothermally derived Sr2CeO4 was found to exhibit higher emission intensity than the solid-state-reaction-derived phosphors. According to the deconvoluted emission spectra, two emission peaks are attributed to two metal-to-ligand charge-transfer states. Based on the deconvoluted results, a qualitative energy-level diagram of Sr2CeO4 was proposed. VUV-excited luminescence studies for Sr2CeO4 indicate that one peak at 193 nm is assigned to the charge-transfer transition between Sr2+ and O2-. ? 2010. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407427 | ISSN: | 00222313 | DOI: | 10.1016/j.jlumin.2009.09.017 |
顯示於: | 化學工程學系 |
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