【摘 要】
：
Ca3-x(PO4)2 ∶xTb3+(0.2≤x≤0.4),Ca2.3(PO4)2∶0.35Tb3+,0.35A+(A=Li,Na,K),and Ca2.3(PO4)2∶0.35Tb3+,yLi+(0.35≤y≤0.455)phosphors were prepared by solid-state reaction.All the prepared phosphors formed a rhombohedral unit cell with the R3c space group.To improve
【机 构】
：
Faculty of Nanotechnology and Advanced Materials Engineering,Sejong University,Seoul,05006,Republic
论文部分内容阅读
Ca3-x(PO4)2 ∶xTb3+(0.2≤x≤0.4),Ca2.3(PO4)2∶0.35Tb3+,0.35A+(A=Li,Na,K),and Ca2.3(PO4)2∶0.35Tb3+,yLi+(0.35≤y≤0.455)phosphors were prepared by solid-state reaction.All the prepared phosphors formed a rhombohedral unit cell with the R3c space group.To improve the photoluminescence(PL)properties of the Ca2.65(PO4)2∶0.35Tb3+phosphor,monovalent charge compensators such as Li+,NA+,and K+were added to the Ca2.65(PO4)2∶0.35Tb3+phosphor.The charge compensators acted as fluxes,so they improved the crystallinity.The excitation and emission properties were significantly improved through the incor-poration of charge compensators.In particular,among the charge compensators,Li+ion substantially enhanced the emission intensity and color purity.Furthermore,considering the evaporation of Li2CO3 during the annealing process,we optimized the concentration of Li+charge compensator to enhance its PL performance.Impressively,the green emission intensity of the Ca2.3(PO4)2∶0.35Tb3+,0.385Li+phosphor was 260％higher than that of the Ca2.65(PO4)2∶0.35Tb3+phosphor.We believe that the effect of charge compensators on the PL properties and the optimum concentration of Li+charge compensator are useful for the design of phosphors in light-emitting diodes.
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