Synthesis and luminescent properties of novel BaGd sub(2)O sub(4):Eu super(3+) scintillating phosphor

• Published in: Luminescence (Chichester, England) Vol. 28; no. 3; pp. 384 - 391
• Main Authors: Sun, Xin-Yuan, Wang, Wen-Feng, Sun, Shou-Qiang, Lin, Liang-Wu, Li, De-Yi, Zhou, Ling-Ping
• Format: Journal Article
• Language: English
• Published: 01.05.2013
• Subjects: Emission; Excitation; Luminescence; Phosphors; Photoluminescence; Scanning electron microscopy; Spectra; Spectral emissivity
• ISSN: 1522-7235; 1522-7243
• DOI: 10.1002/bio.2394

BaGd sub(2-x)O sub(4):xEu super(3+) and Ba sub(1-y)Gd sub(1.79-2y)Eu sub(0.21)Na sub(3y)O sub(4) phosphors were synthesized at 1300 degree C in air by conventional solid-state reaction method. Phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence excitation (PLE) spectra, photoluminescence (PL) spectra and thermoluminescence (TL) spectra. Optimal PL intensity for BaGd sub(2-x)O sub(4):xEu super(3+) and Ba sub(1-y)Gd sub(1.79-2y)Eu sub(0.21)Na sub(3y)O sub(4) phosphors at 276 nm excitation were found to be x=0.24 and y=0.125, respectively. The PL intensity of Eu super(3+) emission could only be enhanced by 1.3 times with incorporation of Na super(+) into the BaGd sub(2)O sub(4) host. Enhanced luminescence was attributed to the flux effect of Na super(+) ions. However, when BaGd sub(2)O sub(4):Eu super(3+) phosphors were codoped with Na super(+) ions, the induced defects confirmed by TL spectra impaired the emission intensity of Eu super(3+) ions. Copyright [copy 2012 John Wiley & Sons, Ltd.