The luminescence and structural characteristics of Eu 3+-doped NaBaPO 4 phosphor

Abstract

Eu 3+-doped NaBaPO 4 was prepared by a high-temperature solid-state reaction. The phase formation was confirmed by X-ray powder diffraction measurements. The laser site-selective excitation and emission spectra have been investigated in the 5D 0 → 7F 0 region by using a pulsed, tunable and narrowband dye laser. The excitation spectra corresponding to the 7F 0 → 5D 0 transition consist of two transitions at 579.6 nm Eu(I) and 578.9 nm Eu(II), indicating the Eu 3+ ions occupy two crystallographic sites of Ba 2+ ions. The decay lifetimes of the two Eu 3+ sites were measured. Two crystallographic sites for Eu 3+ ions doped in NaBaPO 4 lattice were assigned from the luminescence characteristic and structure features. Meanwhile, the charge compensation mechanism of Eu 3+ doping in NaBaPO 4 was discussed.