材料科学
光致发光
荧光粉
替代(逻辑)
离子
化学工程
无机化学
光电子学
计算机科学
化学
有机化学
工程类
程序设计语言
作者
Rahul Ghildiyal,Chao-Yung Hsu,Chung−Hsin Lu
标识
DOI:10.1111/j.1744-7402.2010.02560.x
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 Tb3+ 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.
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