Y 2 O 3 -doped Eu3+ (Y2O3:Eu) nanometer particles (NPs) were synthesized via a chemical route. The particle size estimated by x-ray diffractometry and transmission electron microscopy was about 61 nm. Two photoluminescence peaks were observed at 582 and 587 nm, being attributed to the transition of D05→F1a7 of Eu3+ in the S6 and C2 symmetry sites of Y2O3, respectively. The intensity ratio of the photoluminescence peaks at 582 nm to at 587 nm was larger for NPs than for micrometer particles (MPs). The excitation peak of NPs due to the charge-transfer band shifted toward the high-energy side as compared with that of MPs. According to x-ray diffractometry, the lattice distortion and the lattice constant were larger for NPs than for MPs, showing the restructure at the near surface and the increase in ionicity of the Eu–O bond with decreasing particle size. This explains the blueshift in the excitation peak.

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The luminescence efficiency of the YAG:Tb phosphor has been improved by the application of BaF2 flux to the firing process. Luminescence efficiency is largely determined by the single‐phase crystallinity of cubic YAG:Tb. This phosphor, when used in a projection CRT, shows good stability in the temperature and current dependence of brightness as well as good resistance to electron burning. The effect of BaF2 on the formation of single‐phase cubic YAG and the optical performance of the resulting YAG:Tb phosphor in a CRT are discussed.