Effect of Bi³⁺ on fluorescence properties of YPO₄:Dy³⁺ phosphors synthesized by a modified chemical co-precipitation method

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• 作者：Yuyang He ; ^a ; ^{heyy@xaut.edu.cn} ; Maiqun Zhao^a ; Yanyan Song^a ; Gaoyang Zhao^a ; Xuan Ai^a
• 关键词：YPO₄ ; Dy³⁺ ; Chemical co-precipitation ; Photoluminescence ; Phosphor
• 刊名：Journal of Luminescence
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：131
• 期：6
• 页码：1144-1148
• 全文大小：1165 K

文摘

Y_0.99−xPO₄:0.01Dy³⁺, xBi³⁺ (x=0, 0.01, 0.05, 0.10, 0.15, 0.20 and 0.25) phosphors have been synthesized by a modified chemical co-precipitation method using urea as a pH value regulator. The samples were characterized by X-ray powder diffraction (XRD) and photoluminescence spectroscopy. XRD results show that the samples have only single tetragonal structure when x≤0.15, but extraneous BiPO₄ phase appears besides major tetragonal phase when x≥0.20. The crystallinity of the samples is found to improve with increasing Bi³⁺ ion concentration from 0 to 15 mol % , and then decreased for higher concentrations associated with increasing BiPO₄ phase. Photoluminescence excitation spectra results show that the phosphor can be efficiently excited by ultraviolet light from 250 to 400 nm including four peaks at 294, 326, 352 and 365 nm. Emission spectra exhibit strong blue emission (483 nm) and another strong yellow emission (574 nm). When the Bi³⁺ ion concentration is 1 mol % , the intensity of excitation and emission spectra increased evidently. In addition, the yellow-to-blue emission intensity ratio (I_Y/I_B) is strongly related to the excitation wavelength and not to the Bi³⁺ ion concentration.