Vacuum Ultraviolet Excited Photoluminescence Properties of Novel Na₃Y₉O₃(BO₃)₈:Tb³⁺ Phosphor

The novel vacuum ultraviolet (VUV) excited Na₃Y₉O₃(BO₃)₈:Tb³⁺(NYOB:Tb³⁺) green phosphor is prepared. Strong VUV photoluminescence and high quenching concentration of Tb³⁺ (20wt%) are observed in NYOB:Tb³⁺ and the strong emission are correlated with the unique layer-type structure of NYOB. All the characteristic 4f-5d transitions of Tb³⁺ and the host absorption band in VUV region are identified in the excitation spectrum. Based on the results, the energy levels scheme of Tb³⁺ in NYOB:Tb³⁺ is first established. This newly developed NYOB:Tb³⁺ phosphor shows excellent optical properties when compared with the commercial Zn₂SiO₄:Mn²⁺ and would be a potential VUV-excited green phosphor.