Abstract
Spherical and red nanophosphors of Y2O3:Eu3+ are prepared using urea hydrolysis that needs a long coprecipitation time (>4h) and post-annealing at 800°C for 2h. Three microwave (MW) processing routes of MW-urea hydrolysis, MW-urea-EG solvolysis, and MW-urea-EG+KOH solvolysis were used to achieve short processing time and low energy consumption, thus obtaining high photoluminescence (PL) efficiency. The organic ethylene glycol (EG) solvent could prevent the nanoparticle surface from developing defects and provide a high-temperature bath for homogeneous nucleation and activator homogenization through rapid microwave volume heating. The 611nm red emission of MW-urea-EG+KOH-derived phosphors excited by 466nm was higher than that of the MW-urea-EG-derived phosphors after post-heat treatment at 600°C. The pre-crystallized structure may have formed during microwave heating in EG+KOH system, but the amorphous structure formed in the EG system. The low power (100W for 3.5min) of the MW-urea-EG+KOH process economically reduced the post-heating temperature to 600°C, and maintained the nano-size of phosphors with a high PL intensity. The residual hydroxyl and carbonyl groups on the obtained nanophosphors may be beneficial to be as chemical grafting in subsequent paste/slurry regulation for various LED and FPD applications.
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