Excitation energy dependent chromaticity of BaZr(BO3)2:Eu

The luminescence properties of BaZr(BO₃)₂:5% Eu were investigated under ultraviolet (UV) and vacuum ultraviolet (VUV) excitation and different luminescence behaviors were observed by different excitation energies. After the analyses of the luminescence spectra, the result indicates that Eu³⁺ occupying non-centrosymmetric sites Ba²⁺ can be excited preferentially under 254 nm excitation, while Eu³⁺ occupying centrosymmetric sites Zr⁴⁺ can be excited preferentially under 147 nm excitation.