Abstract
Tb3+ doped Y2O3 nanoparticles of 4–10nm size were synthesized from nitrate precursors by the urea hydrolysis method in ethylene glycol medium at a low temperature of 140°C. Characteristic green emission of Tb3+ corresponding to 5D4→7FJ is observed to be very strong, which is further enhanced with heat treatment temperature. Characteristic blue color emission of Ce3+ ion originating from 5d→2F7/2 (424nm) and 2F5/2 (486nm) transitions are found to be very strong in as-synthesized Ce0.02Tb0.06Y1.92O3 nanoparticles. However, its luminescence intensity decreases with increase in heating temperature or increase in the particle size/crystallinity, whereas a weak emission peak of Tb3+ ion at 545nm is witnessed. The polycrystalline nature of the as-prepared sample changed to highly crystalline state when heated at an elevated temperature (1200°C).
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