【摘 要】
：
Red-emission (Y0.95Eu0.05)2O3 submicron spheres and microplates have been selectively processed via hydrothermal precursor synthesis (150 ℃, 12 h) followed by calcination at 1000 ℃.Detailed characteri
【出 处】
：
2012 Postdoctoral Symposium of China on Materials Science &
论文部分内容阅读
Red-emission (Y0.95Eu0.05)2O3 submicron spheres and microplates have been selectively processed via hydrothermal precursor synthesis (150 ℃, 12 h) followed by calcination at 1000 ℃.Detailed characterizations of the products were achieved by combined means of XRD, FT-IR, FE-SEM and PL analysis.The precursors could be modulated from basic-carbonate submicron spheres to normal carbonate microplates by increasing the urea/(Y+Eu) molar ratio from 10 to 40-100.The resultant oxides largely retain their respective precursor morphologies at 1000 ℃, but shape confined crystal growth was observed for the microplates, yielding enhanced exposure of the (400) facets.Both the (Y0.95Eu0.05)2O3 spheres and microplates exhibit nearly identical positions of the PL bands and similar asymmetry factors of luminescence [I(5D0→7F2)/I(5D0→7F1), ~11] under 250-nm excitation, but the microplates show a significantly stronger red emission at ~613 nm (~1.33 times that of the spheres) owing to their larger particle size and denser packing of primary phosphor crystallites.
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