https://scholars.lib.ntu.edu.tw/handle/123456789/407415
標題: | Microwave-hydrothermally synthesized (Sr1-x-yCe xTby)Si2O2-£_N 2+£g phosphors: Efficient energy transfer, structural refinement and photoluminescence properties | 作者: | Hsu C.-H. Lu C.-H. |
公開日期: | 2011 | 卷: | 21 | 期: | 9 | 起(迄)頁: | 2932-2939 | 來源出版物: | Journal of Materials Chemistry | 摘要: | A facile microwave-assisted hydrothermal method was developed to prepare oxynitride-based (Sr1-x-yCexTby)Si 2O2-£_N2+£g phosphors. The microwave-assisted hydrothermal process led to lower synthesis temperatures and shortened heating duration. The obtained powders exhibited a narrow size distribution. The Rietveld refinement reveals the obtained phosphors to have a triclinic crystal system. For Ce3+ doped SrSi2O 2N2 phosphors, the emission spectrum exhibited an asymmetric band at 447 nm (£fex = 322 nm), corresponding to the blue hue. As Ce3+ and Tb3+ ions were co-doped into SrSi2O2N2, the energy transfer occurred via a dipole-dipole interaction. With increasing the Tb3+ concentration, the Tb3+ emission intensity enhanced and reached a maximum with the Tb3+ concentration of 2 mol%, then decreased due to the concentration quenching effect. It is also observed that the intensity of the Ce3+ emission peak decreased gradually. This indicates the effective energy transfer from Ce3+ to Tb3+ ions. The CIE coordinate of (Sr 1-x-yCexTby)Si2O 2-£_N2+£g phosphors shifted from the blue region towards the green region with increasing Tb3+ concentration. The above findings indicate that the emitting colors of the microwave-hydrothermally derived (Sr1-x-yCexTby)Si2O 2-£_N2+£g phosphors can be tuned over a wide range under UV excitation. ? The Royal Society of Chemistry 2011. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407415 | ISSN: | 09599428 | DOI: | 10.1039/c0jm02501a |
顯示於: | 化學工程學系 |
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