https://scholars.lib.ntu.edu.tw/handle/123456789/407411
標題: | Aliovalent ion substitution and enhanced photoluminescence of Sr 2SiO4:Tb3+/Z+ (Z=Li, Na, and K) phosphors | 作者: | Ghildiyal R. Hsu C.-H. Lu C.-H. |
公開日期: | 2011 | 卷: | 8 | 期: | 4 | 起(迄)頁: | 759-765 | 來源出版物: | International Journal of Applied Ceramic Technology | 摘要: | The role of charge compensatory additives viz. monovalent ions (Li +, K+, and Na+) codoped with Tb3+ in strontium silicate phosphors is investigated. The addition of charge compensators enhances the luminescence intensity of the prepared phosphors because they neutralize the charge generated by Tb3+ substitution for Sr2+ ions. The vacancy and defects created due to Tb3+ ions are suitably minimized by the addition of aliovalent impurities in the host. As the Tb3+ concentration is increased, the green emission surpasses the blue emission due to cross relaxation following the energy transfer process. The role of monovalent Li+ ions among all charge compensator ions used was found to be most effective for enhanced Tb 3+ ion emissions. As the Tb3+ concentration increases, the chromaticity coordinates shifts from the blue to green region and the correlated color temperature moves to the daylight region. ? 2010 The American Ceramic Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407411 | ISSN: | 1546542X | DOI: | 10.1111/j.1744-7402.2010.02560.x |
顯示於: | 化學工程學系 |
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