Synthesis, Luminescence, and Energy-Transfer Properties of 尾-Na2Ca4(PO4)2(SiO4):A (A = Eu2+, Dy3+, Ce3+/Tb3

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• 作者：Kai Li ; Mengmeng Shang ; Dongling Geng ; Hongzhou Lian ; Yang Zhang ; Jian Fan ; Jun Lin
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：July 7, 2014
• 年：2014
• 卷：53
• 期：13
• 页码：6743-6751
• 全文大小：684K
• ISSN：1520-510X

文摘

A series of 尾-Na₂Ca₄(PO₄)₂(SiO₄) (尾-NCPS):A (A = Eu²⁺, Dy³⁺, Ce³⁺/Tb³⁺) phosphors were prepared via a high-temperature solid-state reaction route. The X-ray diffraction, Fourier transform infrared, photoluminescence (PL), cathodoluminescence (CL) properties, fluorescent lifetimes, and absolute quantum yield were exploited to characterize the samples. Under UV radiation, the 尾-NCPS:Eu²⁺ phosphors present bright green emissions, and the 尾-NCPS:Ce³⁺ phosphors show strong blue emissions, which are attributed to their 4f⁶5d¹ 鈫?4f⁷ and 5d鈥?f allowed transitions, respectively. The 尾-NCPS:Ce³⁺, Tb³⁺ phosphors display intense tunable color from blue to green and high absolute quantum yields (81% for 尾-NCPS:0.12Ce³⁺ and 83% for 尾-NCPS:0.12Ce³⁺, 0.08Tb³⁺) when excited at 365 nm. Simultaneously, the energy transfer from Ce³⁺ to Tb³⁺ ions is deduced from the spectral overlap between Ce³⁺ emission and Tb³⁺ excitation spectra and demonstrated by the change of emission spectra and decay lifetimes. Moreover, the energy-transfer mechanism from Ce³⁺ to Tb³⁺ ions is confirmed to be exchange interaction according to the discussion of expression from Dexter and Reisfeld. Under a low-voltage electron-beam excitation, the 尾-NCPS:A (A = Eu²⁺, Dy³⁺, Ce³⁺/Tb³⁺) phosphors exhibit their characteristic emissions, and the emission profiles of 尾-NCPS:Ce³⁺,Tb³⁺ phosphors are obviously different from those of the PL spectra; this difference might be ascribed to their different luminescence mechanisms. These results in PL and CL properties suggest that 尾-NCPS:A (A = Eu²⁺, Dy³⁺, Ce³⁺/Tb³⁺) phosphors are potential candidates for solid-state lighting and field-emission displays.