Eu-doped ZrO 2 and Zr 1−x Ce x O 2 (x = 0-0.2) nanoparticles were prepared by a hydrothermal method. The photoemission spectra of Zr 1−x Ce x O 2 :Eu 3+ nanocrystalline samples showed the typical emission of Eu 3+ ions assigned to 5 D 0 → 7 F 1 (590 nm) and 5 D 0 → 7 F 2 (610 nm) transitions and additional emissions of 5 D 0 → 7 F J with higher J. The spectra were measured at two excitation wavelength of 340 nm (indirect) and 467 nm (direct), and the direct excitation emission was less

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... compared with 340 nm-induced emission. Asymmetry ratio which was measured by indirect excitation was more effective for monitoring a local lattice distortion in CeO 2 -ZrO 2 . This is a fundamental knowledge about luminescent spectra for evaluating the nature of catalytic properties.