Effect of Excitation Wavelength on Photoemission Properties of Eu-doped Zr_1−xCe_xO₂ (x = 0-0.2) Nanoparticles

抄録

Eu-doped ZrO₂ and Zr_1−xCe_xO₂ (x = 0–0.2) nanoparticles were prepared by a hydrothermal method. The photoemission spectra of Zr_1−xCe_xO₂:Eu³⁺ nanocrystalline samples showed the typical emission of Eu³⁺ ions assigned to ⁵D₀→⁷F₁ (590 nm) and ⁵D₀→⁷F₂ (610 nm) transitions and additional emissions of ⁵D₀→⁷F_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 sensitive compared with 340 nm-induced emission. Asymmetry ratio which was measured by indirect excitation was more effective for monitoring a local lattice distortion in CeO₂-ZrO₂. This is a fundamental knowledge about luminescent spectra for evaluating the nature of catalytic properties.