Synthesis of CaWO 4:Eu 3+ phosphor powders via a combustion process and its optical properties

• Published in: Materials letters Vol. 62; no. 10; pp. 1681 - 1684
• Main Authors: Lou, Xiaoming, Chen, Donghua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2008
• Subjects: CaWO 4:Eu 3; Combustion process; Luminescence; Nanoparticle; Optical materials and properties; CaWO 4:Eu 3; Combustion process; Nanoparticle; Luminescence; Optical materials and properties
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2007.09.066

Using citric acid as chelating agent and fuel, ammonium nitrate as fuel, boric acid as flux material and silica as supports, persistent phosphor CaWO 4:Eu 3+ has been prepared via a combustion process, which formed voluminous white powder. The persistent phosphor was further investigated by X-ray diffractometer (XRD), fluorescence spectrophotometer (PL) and transmission electron microscopy (TEM). XRD analyses indicate that the crystalline calcium tungstate has been synthesized when ignited at 500 °C. The PL results showed the highest intensity of emission spectrum obtained at 800 °C, the optimal contents is 0.7CaWO 4:0.3Eu 3+ incorporated into silica which could enhance luminescence intensity of CaWO 4:Eu 3+. The average particle sizes as measured by TEM are ranged in 50 to 100 nm, which could extend the application of this phosphor.