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Ce 3+ -doped yttrium aluminum garnet (YAG:Ce) nanocrystals were successfully synthesized via a facile sol-gel method. Multiple characterization techniques were employed to study the structure, morphology, composition and photoluminescence properties of YAG:Ce nanophosphors. The YAG:Ce 0.0055  sintered at 1030 °C exhibited a typical 5 d  1 -4 f  1  emission band with the maximum peak located at 525 nm, and owned a short fluorescence lifetime  τ  1  (~28 ns) and a long fluorescence lifetime  τ  2  (~94 ns). Calcination temperature and Ce 3+  doping concentration have significant effects on the photoluminescence properties of the YAG:Ce nanophosphors. The emission intensity was enhanced as the calcination temperature increased from 830 to 1030 °C, but decreased dramatically with the increase of Ce 3+  doping concentration from 0.55 to 5.50 at.% due to the concentration quenching. By optimizing the synthesized condition, the strongest photoluminescence emission intensity was achieved at 1030 °C with Ce 3+  concentration of 0.55 at.%.

Effects of local structure of Ce3+ ions on luminescent properties of Y3Al5O12:Ce nanoparticles