Luminescence of Y_2O_3:Eu~(3+)Nanoparticles Synthesized from Urea Containing Nitrate Based Liquid Precursor by Flame Spray Pyrolysis

摘要

Red light emitting Eu~(3+) doped Y_2O_3 nanophosphor was prepared by Flame Spray Pyrolysis (FSP) from nitrate based liquid precursors. Different molar percentages of urea were added into the precursor, addition of urea increases the temperature in the flame zone and promotes the formation of nano-size and spherical shaped particles. The importance of urea in the precursor to obtain well dispersed Y_2O_3:Eu~(3+) nanophosphor has been studied. The characteristics of nanophosphor such as crystallinity, morphology and photoluminescence in the presence of different moles of urea in nitrate based aqueous solution were investigated. Cubic phase Y_2O_3:Eu~(3+) nanophosphor with high crystallinity was obtained directly without any post-heat treatments. Luminescence intensity of nanophosphor increased with the amount of urea till 2 M, further increase in urea concentration was found to reduce the PL intensity. We have developed a continuous single-step fabrication method for nanocrystalline Y_2O_3:Eu~(3+) nanophosphor without any post-heat treatments procedure.