Abstract
Y 2O 3:Eu red-emitting nanophosphors were synthesized directly by dissolving Y 2O 3 and Eu 2O 3 in HNO 3 and by using an atmospheric microwave-plasma torch for a direct continuous preparation and for mass production of Y 2O 3:Eu powders. Atmospheric microwave plasmas produce a high-temperature plasma flame due to ohmic heating by high frequency electric fields, revealing a maximum central temperature of 6500 ± 350 K. Therefore, the synthesized Y 2O 3:Eu nanophosphors from instantaneous evaporation of dissolved Y 2O 3 and Eu 2O 3 in HNO 3 have favorable characteristics such as regular size and cubic equilibrium structure. The nanophosphors were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL).
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