Citrate-Mediated Hydrothermal Route to Synthesis A Large-Scale Y2O3: Eu3+ Hexangular Prism
Europium-doped yttrium oxide (Y<,2>O<,3>: Eu<,3+>) 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 Y<,2> O<,3>: Eu<,3+> hexangular prisms are about 3μm in rim and 10μm 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.
hydrothermal crystal growth luminescence rare earths
Wan Junxi(万军喜) Yao Youwei(姚有为) Miao Chunyan(缪春燕) Tang Guoyi(唐国翌)
Institute of Advanced Materials, Graduate School of Shenzhen, Tsinghua University, Shenzhen 518055, Institute of Advanced Materials, Graduate School of Shenzhen, Tsinghua University,Shenzhen 518055, C
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
115-119
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）