Photoluminescence properties of (Ba1−xEux)WO4 red synthesized by the coprecipitation/calcination method

• Published in: Journal of alloys and compounds 2012-04, Vol.521, p.146-149
• Main Authors: Feng, Wen-Lin, Zhao, Ming-Fu, Xue, Ji-Yuan, Tian, Xiao-Jiao
• Format: Article
• Language: English
• Subjects: (Ba1−xEux)WO4; Calcination; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Coprecipitation; Emission; Exact sciences and technology; Excitation; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Phosphor; Phosphors; Photoluminescence; Physics; Scanning electron microscopy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2012.01.098

► Ba1−xEuxWO4 red phosphors are synthesized by coprecipitation/calcination method. ► The obtained powders are identified by X-ray diffraction, scanning electron microscope (SEM) and fluorescence spectrometer. ► Spectroscopic study of Eu3+ ions was made at room temperature. The optimal doping concentration and concentration quenching mechanism are discussed. In this paper, we report on the series of novel red phosphors (Ba1−xEux)WO4 were synthesized by coprecipitation/calcination method. The morphology and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Photoluminescence (PL) excitation and emission spectra were also used to characterize the (Ba1−xEux)WO4. The results showed that all phosphors present a scheelite-type tetragonal structure with space group (I41/a). The SEM images showed that the grains were like shuttles with sizes ranging from 3.0 to 7.0μm. The obtained (Ba1−xEux)WO4 phosphor emitted red emission centered at 612nm corresponding to the 5D0→7F2 transition of Eu3+ when was excited by 394nm and 465nm which well matched with near-ultraviolet and blue chips. The optimized concentration of Eu3+ was 20mol.% for the highest PL emission intensity which was excited at 534nm. The concentration quenching occurred when the Eu3+ concentration was beyond 20mol.%.