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A monodisperse spherical Y 2 O 3 :Eu 3+ phosphor was prepared by a homogeneous precipitation method. The mean size of the phosphor particles (MSPP) was successfully controlled by changing the volume ratio of normal alcohol (RA) (propanol) in the solvents mixed between deionized water and normal propanol. When the RA was increased from 0 to 0.7, the MSPP decreased while maintaining a high yield of >95%. Although the prepared phosphor samples were fired at the same temperature, the thermal energy was delivered more efficiently into the inner side of the phosphor particles with the decrease of the MSPP. Therefore, the crystallinity and also the photoluminescence (PL) intensity of the phosphor increased with the decrease in the MSPP. In addition, because the numbers of Eu 3+ ions located near the particle surfaces increased with the decrease of particle size, the ratio of PL intensity caused by the 5 D 0 – 7 F 2 transition to that caused by 5 D 0 – 7 F 1 transition increased from 10.8 to 12.7 with the decrease in MSPP.

Particle size control of a monodisperse spherical Y2O3:Eu3+ phosphor and its photoluminescence properties

Particle size control of a monodisperse spherical Y₂O₃:Eu³⁺ phosphor and its photoluminescence properties