Abstract
Nanocrystalline Y 2Si 2O 7:Eu phosphor with an average size about 60 nm is easily prepared using silica aerogel as raw material under ultrasonic irradiation and annealing temperature at 300–600 °C and this nanocrystalline decomposes into Y 2O 3:Eu and silica by heat treatment at 700–900 °C. The excitation broad band centered at 283 and 254 nm results from Eu 3+ substituting for Y 3+ in Y 2Si 2O 7 and Y 2O 3/SiO 2, respectively. Compared with Y 2O 3:Eu/SiO 2 crystalline, the PL excitation and emission peaks of Y 2Si 2O 7:Eu nanocrystalline red-shift and lead to the enhance of its luminescence intensity due to the different chemical surroundings of Eu 3+ in above nanocrystallines. The decrease of PL intensity may be ascribed to quenching effect resulting from more defects in Y 2O 3:Eu/SiO 2 crystalline.
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