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[摘要]：Eu3+ doped (Gd,Lu)(2)O-3 nanopowders with particle sizes ranging from 20 to 70 nm were synthesized by the co-precipitant method using mixed precipitants, namely the mixture of ammonium hydroxide (NH3 center dot H2O) and ammonium hydrogen carbonate (NH4HCO3). The precipitate precursor prepared by this method was believed to possess a basic carbonate composition and its thermal decomposition of the (Gd,Lu)(2)O-3:Eu3+ powders were investigated by Thermogravimetric analysis and differential thermal analysis (TG-DTA). This preparation was followed by a calcination process at 800-1100 degrees C and corresponding phosphor structure were examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Photoluminescence measurement of the (Gd,Lu)(2)O-3:Eu3+ particles show typical red emission at the 612 nm corresponding to the D-5(0) -> F-7(2) transition. We found that the optimal Eu3+ molar doping concentration, calcined temperature and reaction time were 7 mol%, 1000 degrees C, and 2 h, respectively, which is helpful to obtain the final transparent ceramics with excellent properties. (C) 2011 Elsevier B.V. All rights reserved. |
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