Synthesis, size control and luminescence properties of monodispersed(Y,Gd)2O3:Eu3+ phosphor microspheres

点击翻译按钮获取中文摘要

Synthesis and size control of monodisppered microspheres of Ln(OH)CO3・nH2O (Ln=Y,Gd,Eu) have been successfully achieved via homogeneous precipitation. Formation domain of the monospheres was defined. It was found that the addition of organic co-solvent promotes coprecipitation of the constituent rare-earth cations. Dispersed (Y,Gd)2O3:Eu3+ phosphor microspheres were obtained by calcining the basic carbonate precursors. It was confirmed that the phosphor monospheres exhibit stronger luminescence of Eu3+ at a decreased particle size. Utilizing the energy transfer from Gd3+ to Eu3+, the luminescence intensity was enhanced. Owing to the lower electronegativity of Gd3+ than Y3+, the phosphors exhibit red-shifted center of the charge transfer excitation band at a higher Gd3+ content. The fluorescence lifetime was determined to be about 1.5 ms for the phosphors, irrespective of the Gd3+ content.