A novel long lasting phosphor Sr₅ (PO₄)₃F_xCl_1-x:Eu²⁺,Gd³⁺ prepared in air condition

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• 作者：Yaomin DENG ; Shuangping YI ; Jun HUANG ; Weiren ZHAO ; Xiabing FANG
• 关键词：Sr5 (PO4)3FxCl1&minus ; x ; Eu2+ ; Gd3+ ; afterglow phosphors ; LLP material ; self-reduction ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：October, 2013
• 年：2013
• 卷：31
• 期：10
• 页码：962-968
• 全文大小：1370 K

文摘

A series of blue long afterglow mixed halide-phosphate phosphors Sr₅ (PO₄)₃ F_xCl_1鈭?em>x:Eu²⁺,Gd³⁺ were synthesized in air by traditional solid-state reaction route. The crystal structures, photoluminescence, thermoluminescence properties and afterglow properties of the phosphors were characterized systematically using X-ray diffraction (XRD), luminescence spectrophotometer, microcomputer thermoluminescence dosimeter and single photon counter, respectively. Under 280 nm excitation, the broadband emissions of Eu²⁺ ions were observed at 445 nm (blue) due to the 4f⁷鈫?f⁶5d transition. It was demonstrated that there existed the self-reduction of the Eu³⁺ to Eu²⁺ ions in this special halide-phosphate matrix in air condition. The addition of Gd³⁺ ions obviously enhanced the afterglow properties of the single doped Eu²⁺ ions in the halide-phosphate phosphors. And the content of the fluoride anions also had significant influence on the afterglow properties. All results indicated that Sr₅ (PO₄)₃ F_xCl_1鈭?em>x:Eu²⁺,Gd³⁺ might be potential phosphors for long lasting phosphorescence (LLP) materials.