Green emission enhancement of Ba2SiO4:Eu2+ phosphor via Gd co-doping and charge compensation

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• 作者：Xuejing Li (1) (2)
  Yujun Liang (1) (2)
  Fan Yang (2)
  Zhanggen Xia (2)
  Wenzhu Huang (2)
  Yunli Li (2)
  
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2013
• 出版时间：September 2013
• 年：2013
• 卷：24
• 期：9
• 页码：3199-3203
• 全文大小：290KB
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• 作者单位：Xuejing Li (1) (2)
  Yujun Liang (1) (2)
  Fan Yang (2)
  Zhanggen Xia (2)
  Wenzhu Huang (2)
  Yunli Li (2)
  
  1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, 430074, People’s Republic of China
  2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, People’s Republic of China
  

文摘

A series of new green-emitting Ba2?x?ySiO4:xEu2+, yGd3+, yR+ (R?=?Li, Na or K) phosphors were synthesized by the solid-reaction method. X-ray diffraction (XRD) and fluorescence spectrophotometer are utilized to characterize the crystal structure and luminescence properties of the as-synthesized phosphors, respectively. The XRD patterns reveal that the doping of Gd3+, Eu2+ and R+ ions have no significant influence on the Ba2SiO4 phase. The green emission of Eu2+ ion associated with 4f65d1?→?f7 can be obtained by 396?nm UV excitation source, which match well with the emission wavelength of UV-LEDs chip (380-20?nm). Moreover, the effect of charge compensator ions (Li+, Na+ or K+) on the luminescence intensity of (Ba, Gd)2SiO4:Eu2+ phosphors were also investigated. When introducing the Li+ ions into the (Ba, Gd)2SiO4 host lattices, the as-prepared phosphors show the strongest emission. The emission intensity of Ba1.95SiO4:0.04Eu2+, 0.005Gd3+, 0.005Li+ is about 1.39 times than that of Ba1.96SiO4:0.04Eu2+. Furthermore, the mechanism of energy transfer and concentration quenching of Ba1.982?xSiO4:xEu2+, 0.009Gd3+, 0.009Li+ phosphors are also discussed.