Abstract
Using rare earth coordination polymers with aromatic carboxylic acids as the precursors of rare earth oxide components, with polyethylene glycol (PEG) as the dispersing media, micro-crystalline phosphors RENbO4:Ln3+ (RE=Y,Gd,Lu; Ln=Eu,Tb) have been synthesized by an in situ co-precipitation method. Both X-ray diffraction and scanning electron microscopy have shown that the resultant samples present are crystalline with ‘rice glue ball’ micro-morphology and crystalline grain sizes in the range of 1–2μm. The luminescent properties of these phosphors have been studied, which show that the best photoluminescent performance is achieved for GdNbO4:Tb3+ or Eu3+. This was because Gd3+ plays an important role to enhance the luminescence of Tb3+ or Eu3+ in an energy transfer process. In addition, the influence of the doping concentration on the fluorescence behaviors has been examined. With increase of the doping concentration from 1mol% to 5mol%, both the red emission intensity of Eu3+ and the green emission intensity of Tb3+ increase.
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