Abstract
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 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 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.
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Sahu, I.P. Effect of charge compensator ion on dysprosium doped di-calcium magnesium di-silicate phosphors. J Mater Sci: Mater Electron 28, 892–902 (2017). https://doi.org/10.1007/s10854-016-5604-0
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DOI: https://doi.org/10.1007/s10854-016-5604-0