Motloung S J, Shaat S K K, Tshabalala K G, Ntwaeaborwa O M
Department of Physics, University of the Free State, Phuthaditjhaba, South Africa.
Department of Physics, Islamic University, Gaza Strip, Palestine.
Luminescence. 2016 Aug;31(5):1069-76. doi: 10.1002/bio.3073. Epub 2016 Jan 7.
Terbium-doped gadolinium orthovanadate (GdVO4 :Tb(3+) ), orthophosphate monohydrate (GdPO4 ·H2 O:Tb(3+) ) and orthovanadate-phosphate (GdV,PO4 :Tb(3+) ) powder phosphors were synthesized using a solution combustion method. X-Ray diffraction analysis confirmed the formation of crystalline GdVO4 , GdPO4 ·H2 O 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 VO4 (3-) and minor excitation bands assigned to f → f transitions of Tb(3+) . Four characteristic emission peaks were observed at 491, 546, 588 and 623 nm, and are attributed to (5) D4 → (7) Fj (j = 6, 5, 4 and 3). The photoluminescent prominent green emission peak ((5) D4 → (7) F5 ) was centred at 546 nm. The structure and possible mechanism of light emission from GdV1-x Px O4 :% Tb(3+) are discussed. Copyright © 2016 John Wiley & Sons, Ltd.
采用溶液燃烧法合成了掺铽的正钒酸钆（GdVO4 :Tb(3+)）、一水合正磷酸盐（GdPO4·H2O:Tb(3+)）和钒酸 - 磷酸盐（GdV,PO4 :Tb(3+)）粉末荧光粉。X射线衍射分析证实形成了结晶态的GdVO4、GdPO4·H2O和GdV,PO4。扫描电子显微镜图像显示该粉末由不同形状的颗粒团聚而成，形状从球形到椭圆形再到线状结构。通过能量色散光谱确认了存在的化学元素，并通过傅里叶变换红外光谱测定了伸缩模式频率。紫外 - 可见光谱显示在200 nm处有一个强吸收带，其最大值归因于VO4(3 - )的吸收，还有归属于Tb(3+)的f→f跃迁的次要激发带。在491、546、588和623 nm处观察到四个特征发射峰，它们归因于(5)D4→(7)Fj（j = 6、5、4和3）。光致发光突出的绿色发射峰((5)D4→(7)F5)位于546 nm处。讨论了GdV1 - xPxO4 :% Tb(3+)的发光结构和可能机制。版权所有© 2016约翰威立父子有限公司。
