Enhanced photoluminescence property of co-doped ZnB 2 O 4 : Eu 3+ , Tb 3+ phosphor prepared by a thermal conversion meth
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e co-doped ZnB2O4:Eu31, Tb31 phosphor was prepared by a thermal conversion method using Zn[B3O3(OH)5]H2O:Eu31, Tb31 as the precursor, which was characterized by energy dispersive x-ray spectrometer, x-ray powder diffraction, infrared, scanning electron microscopy, and photoluminescence. The effects of doped concentration, calcining temperature, and calcining time of precursor on the luminescence property of ZnB2O4: Eu31, Tb31 phosphor were investigated. The results showed that the ZnB2O4: Eu31, Tb31 phosphor with maximum luminescent intensity was obtained by calcining the precursor at 900 °C for 6 h. It is found that the ZnB2O4: Eu31, Tb31 phosphor prepared by this method exhibits much stronger emission intensity than that synthesized by conventional high temperature solid-state method. Meanwhile, ZnB2O4: Eu31, Tb31 also has stronger emission intensity and higher red to orange ratio than those of ZnB2O4: Eu31.
I. INTRODUCTION
There are many kinds of zinc borates found in nature as well as synthesized in the laboratory. Some of these borates have useful properties. During the past years, many borates were chosen as host lattices for phosphors because of their large band gap, high thermal stability, high luminescence efficiency, and low cost.1,2 In recent years, zinc borates began to obtain some attentions being a host for photoluminescence (PL) applications, which were activated by trivalent rareearth ions. For the preparation of lanthanide doped zinc borates luminescent materials, several methods have been designed, for example, Li et al. prepared Zn(BO2)2:Tb31 or Dy31 powder samples by the method of solid phase reaction at high temperature.3,4 Zheng et al. prepared Eu31 doped ZnB2O4 with coprecipitation method.5 Liu et al. prepared Eu31, Bi31 co-activated ZnB2O4 with solid state reactions and found Eu31 in ZnB2O4 exhibits a dominant emission peak at 610 nm under the excitation at 393 nm.6 Mu et al. prepared Bi31, Gd31 co-doped ZnB2O4 with solid state method.7 To the best of our knowledge, the luminescence properties of Eu31 and Tb31 co-activated ZnB2O4 have not been reported yet. In this paper, we report a novel thermal conversion method for preparation of ZnB2O4:
Eu31, Tb31 phosphor using Zn[B3O3(OH)5]H2O: Eu31, Tb31 as the precursor for the first time. The results show that ZnB2O4: Eu31, Tb31 has stronger emission intensity than that prepared by conventional high temperature solid state reaction method. Meanwhile, ZnB2O4: Eu31, Tb31 has stronger emission intensity and higher red to orange ratio than ZnB2O4: Eu31. II. EXPERIMENTAL A. Preparation of Zn[B3O3(OH)5]H2O: Eu31, Tb31 precursor
All of the reagents were of analytical grade and used directly without further purification. In a typical synthesis, stoichiometric ZnSO47H2O, Eu2O3, and Tb4O7 were dissolved in 80 mL of H2O, in which Tb31 ion doped concentration was variable from 1 mol% to 15 mol% of total mole numbers for Zn21, Eu31, and Tb31 while the Eu31 doped concentration was fixed 6 mol% of Zn21, Eu31, and Tb31. And then, 80 mL of solution containing 0.0
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