Abstract
Europium-doped Lu 2O 3 phosphors were prepared via a co-precipitation process. The influence of precipitants on morphology and dispersibility of the obtained Lu 2O 3 powders were investigated. Precipitation was performed with three different precipitants, namely ammonium hydroxide (NH 3·H 2O), ammonium hydrogen carbonate (NH 4HCO 3), and the mixture of NH 3·H 2O and NH 4HCO 3. Ultrafine, nearly monodispersed, weakly agglomerated and near-spherical lutetia powders could be obtained with mixed NH 3·H 2O and NH 4HCO 3 as the precipitant. The precipitate precursor with the mixed precipitant was believed to possess a basic carbonate composition and its thermal decomposition and phase evolution processes were investigated. Photoluminescence characteristics of Lu 2O 3:Eu 3+ phosphors obtained by this modified precipitation method were also studied.
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