Structure and photoluminescent properties of green-emitting terbium-doped GdV1−xPxO4 phosphor prepared by solution combustion method

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• 作者：S. J. Motloung ; S. K. K. Shaat ; K. G. Tshabalala and O. M. Ntwaeaborwa
• 刊名：Luminescence
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：31
• 期：5
• 页码：1069-1076
• 全文大小：1266K
• ISSN：1522-7243

文摘

Terbium-doped gadolinium orthovanadate (GdVO₄:Tb³⁺), orthophosphate monohydrate (GdPO₄·H₂O:Tb³⁺) and orthovanadate–phosphate (GdV,PO₄:Tb³⁺) powder phosphors were synthesized using a solution combustion method. X-Ray diffraction analysis confirmed the formation of crystalline GdVO₄, GdPO₄·H₂O and GdV,PO₄. Scanning electron microscopy images showed that the powder was composed of an agglomeration of particles of different shapes, ranging from spherical to oval to wire-like structures. The chemical elements present were confirmed by energy dispersive spectroscopy, and the stretching mode frequencies were determined by Fourier transform infrared spectroscopy. UV–visible spectroscopy spectra showed a strong absorption band with a maximum at 200 nm assigned to the absorption of VO₄³⁻ and minor excitation bands assigned to f → f transitions of Tb³⁺. Four characteristic emission peaks were observed at 491, 546, 588 and 623 nm, and are attributed to ⁵D₄ → ⁷F_j (j = 6, 5, 4 and 3). The photoluminescent prominent green emission peak (⁵D₄ → ⁷F₅) was centred at 546 nm. The structure and possible mechanism of light emission from GdV_1−xP_xO₄:% Tb³⁺ are discussed. Copyright