Abstract
Y 4Al 2O 9:Eu 3+ phosphor was synthesized through a sol–gel combustion method. The Y 4Al 2O 9 phase can form through sintering at 800 °C. This temperature is much lower than that required via the solid state reaction method. The average grain size of the phosphor was about 30 nm. Compared with the amorphous phosphor, the charge transfer band of crystalline phosphor shows a blue shift. The emission of Y 4Al 2O 9:Eu 3+ indicates the existence of two luminescent centers, in agreement with the crystal structure of Y 4Al 2O 9. Higher doping concentration could be realized in Y 4Al 2O 9 nanocrystal host lattice. This indicates that the sol–gel combustion synthesis method can increase emission intensity and quenching concentration due to a good distribution of Eu 3+ activators in Y 4Al 2O 9 host.
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