Citrate-Mediated Hydrothermal Route to Synthesis A Large-Scale Y2O3∶Eu3+ Hexangular Prism
来源期刊：Journal of Rare Earths2007年第S1期
论文作者：万军喜 姚有为 缪春燕 唐国翌
文章页码：115 - 119
摘 要：Europium-doped yttrium oxide （Y2O3∶Eu3+） hexangular microprisms were synthesized through a citrate-mediated hydrothermal method followed by subsequent calcination. The as-prepared products were characterized by X-Ray Powder Diffractometer （XRD）, Field Emission Scanning Electron Microscopy （FE-SEM）, and fluorescence spectrometer. The sizes of the Y2O3∶Eu3+ hexangular prisms are about 3 μm in rim and 10 μm in length. The citrate additive was found to be responsible for tailoring the crystal growth dynamically: the concentration of hydroxides in solution is reduced via forming citrate-rare earth ion complexes, giving rise to large crystals with perfect facets; the ratio of growth rate of hydroxides along the c-axis and other crystal facets is suppressed, leading to relatively small aspect ratio. The smooth surface and large size led to the luminescence intensity of hexagonal-prism phosphors higher than that of needle-like bundle products obtained without using trisodium citrate additive.
万军喜，姚有为，缪春燕，唐国翌
摘 要：Europium-doped yttrium oxide （Y2O3∶Eu3+） hexangular microprisms were synthesized through a citrate-mediated hydrothermal method followed by subsequent calcination. The as-prepared products were characterized by X-Ray Powder Diffractometer （XRD）, Field Emission Scanning Electron Microscopy （FE-SEM）, and fluorescence spectrometer. The sizes of the Y2O3∶Eu3+ hexangular prisms are about 3 μm in rim and 10 μm in length. The citrate additive was found to be responsible for tailoring the crystal growth dynamically: the concentration of hydroxides in solution is reduced via forming citrate-rare earth ion complexes, giving rise to large crystals with perfect facets; the ratio of growth rate of hydroxides along the c-axis and other crystal facets is suppressed, leading to relatively small aspect ratio. The smooth surface and large size led to the luminescence intensity of hexagonal-prism phosphors higher than that of needle-like bundle products obtained without using trisodium citrate additive.
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