Effect of charge compensator ion on dysprosium doped di-calcium magnesium di-silicate phosphors

详细信息    查看全文

• 作者：Ishwar Prasad Sahu
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：1
• 页码：892-902
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

In the present article, effect of charge compensator ions (R+ = Li+, Na+ and K+) on dysprosium doped di-calcium magnesium di-silicate (Ca₂MgSi₂O₇:Dy3+) phosphors were investigated. The Ca₂MgSi₂O₇:Dy3+ and Ca₂MgSi₂O₇:Dy3+, R+ (R+ = Li+, Na+ and K+) phosphors were prepared by the traditional high temperature solid state reaction method. The crystal structures of sintered phosphors were an akermanite type structure which belongs to the tetragonal crystallography. Thremoluminescence kinetic parameters such as activation energy (E), order of kinetics (b), and the frequency factor (s) of synthesized phosphors has been calculated by the peak shape method. The prepared Ca₂MgSi₂O₇:Dy3+ and Ca₂MgSi₂O₇:Dy3+, R+ phosphors were excited at 350 nm and their corresponding emission spectrum were recorded at blue (481 nm) and yellow (574 nm) region due to the 4F_9/2 → ^{6H_15/2 and 4F_9/2 → 6H_13/2 transitions respectively of Dy3+ ions. The combination of these two emissions constituted as white light; confirmed by the Commission Internationale de L’Eclairage chromaticity diagram. The possible mechanism of white light emitting Ca₂MgSi₂O₇:Dy3+ and Ca₂MgSi₂O₇:Dy3+, R+ phosphors were also investigated. The addition of charge compensator ions enhances the luminescence intensity of prepared Ca₂MgSi₂O₇:Dy3+ phosphors because they neutralize the charge generated by Dy3+ substitution for Ca2+ ions. The role of Li+ ions among all charge compensator ions (Na+ or K+) used was found to be most effective for enhanced Dy3+ ion emission.}