The luminescence of Eu³⁺ activated Ba₂Mg(BO₃)₂ phosphors

Abstract

Phosphors of Eu³⁺ activated Ba₂Mg(BO₃)₂ were prepared by a high-temperature solid-state reaction technique. The phase purity was characterized by powder X-ray diffraction (XRD). The luminescence properties in the VUV–vis range as well as the decay curves have been investigated. The results demonstrate that the band near 176 nm in the VUV excitation spectra can be ascribed to host-related absorption. The charge-transfer bands (CTBs) of O²⁻ → Eu³⁺ in Ba₂Mg(BO₃)₂:Eu³⁺ are at about 231 nm. The emission intensity of the ⁵D₀→⁷F₁ transition (594 nm) is dominant upon excitations at 172 nm or 231 nm (CTB), while that of ⁵D₀→⁷F₂ transition (613 nm) is dominant when excitations are at 395 nm (the ⁷F₀→⁵L₆ transition of Eu³⁺) or at other f–f transitions.