Abstract
Fine particles of red emission phosphors, (Y 1 - x La x ) 2 O 3 :Eu 3 + , have been synthesized by microwave-assisted hydrolysis using urea, and their luminescent properties were compared with Y 2 O 3 :Eu 3 + fine particles without La 3 + doping as well as a commercial Y 2 O 3 :Eu 3 + . The limiting value of Eu 3 + content where concentration quenching starts was enhanced by La 3 + doping into the host Y 2 O 3 lattice, and photoluminescence emission intensity of the La 3 + -doped samples rose more than before doping. On the contrary to the general tendency that emission intensity decreases with particle size reduction, the emission intensity of the (Y 1 - x La x )O 3 :Eu 3 + fine particles (0.57 μm) was equal to that of the larger commercial Y 2 O 3 :Eu 3 + (3.1 μm).
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