Pyrolysis synthesis of Zn₂SiO₄:Mn²⁺ phosphors - effect of fuel, flux and co-dopants

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• 作者：V. Sivakumar ; Arunachalam Lakshmanan
• 关键词：Pyrolysis ; Zn2SiO4 ; Mn ; Display phosphor ; Photoluminescence ; Co-dopants ; flux
• 刊名：Journal of Luminescence
• 出版年：January, 2014
• 年：2014
• 卷：145
• 期：Complete
• 页码：420-424
• 全文大小：1132 K

文摘

Green emitting 伪-Zn₂SiO₄:Mn²⁺ phosphors were made by pyrolysis route at 600 掳C followed by sintering at a moderate temperature of 1000 掳C for 1 h duration. The effects of different fuels (urea, citric acid, polyethylene glycol and glycine), flux materials (H₃BO₃, NH₄Cl, NH₄F, NH₄Br, BaCl₂, BaBr₂, CaF₂ and BaF₂), divalant co-dopants (Ca²⁺, Ba²⁺, Mg²⁺ and Sr²⁺), trivalent co-dopants (Al³⁺, Y³⁺ and Gd³⁺) and sintering temperature (800-1000 掳C) on the photoluminescence (PL) efficiency of Zn₂SiO₄:Mn²⁺ were studied. Among the fuels, urea and among the flux, H₃BO₃ gave a maximum broad band green PL emission peak at 525 nm on excitation at 254 nm. Divalent co-dopants improved the PL intensity much more than the trivalent co-dopants used. Highest PL efficiency was observed with Sr²⁺ co-doped Zn₂SiO₄:Mn²⁺ sintered at 1000 掳C in reducing atmosphere which was 20% higher than that of the commercial Zn₂SiO₄:Mn²⁺. The formation of a single crystalline phase of willemite structure in the 伪-Zn₂SiO₄:Mn²⁺ samples synthesized was confirmed by powder XRD measurements.