Abstract
Nanocrystalline powders of Y3Al5O12:Ce (YAG:Ce) were prepared using Pechini technique and precipitation with urea at 80–90 °C. It was shown that material obtained using Pechini procedure, after heating at 900–1000 °C is crystallographically pure, while that made with urea is contaminated with Y4Al2O9 and YAlO3. For all powders, heating at reducing atmosphere of nitrogen–hydrogen mixture at 1000 °C caused a red shift of the Ce3+ luminescence by about 20–25 nm. The effect was stronger for the powder prepared with urea. Also this powder was characterized by a longer decay time of the Ce3+ emission indicating the treatment at reducing atmosphere diminished nonradiative relaxation probability of the excited electrons.
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