Abstract
Long-lasting phosphorescence was observed from Ti-doped BaZrO 3 perovskite synthesized by a solid-state reaction. The phosphorescence color is blue and the phosphorescence can still be seen with the naked eye in the dark for 30 min or more after stopping UV irradiation. By the measurements of electron spin resonance (ESR) spectra, it was confirmed that F + center and Zr 3+ exist in non-luminescent undoped BaZrO 3 and their concentrations decreased with the additive amount of TiO 2. It is expected that the luminescence center is F A center composed of Ti 3+ and F + center.
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