Insights into the discrepant luminescence for BaSiO₃ :Eu²⁺ phosphors prepared by solid-state reaction and precipitation reaction methods

Two synthesis routes, solid-state reaction and precipitation reaction, were employed to prepare BaSiO₃ :Eu²⁺ phosphors in this study. Discrepancies in the luminescence green emission at 505 nm for the solid-state reaction method sample and in the yellow emission at 570 nm for the sample prepared by the precipitation reaction method, were observed respectively. A detail investigation about the discrepant luminescence of BaSiO₃ :Eu²⁺ phosphors was performed by evaluation of X-ray diffraction (XRD), photoluminescence (PL)/photoluminescence excitation (PLE), decay time and thermal quenching properties. The results showed that the yellow emission was generated from the BaSiO₃ :Eu²⁺ phosphor, while the green emission was ascribed to a small amount of Ba₂ SiO₄ :Eu²⁺ compound that was present in the solid-state reaction sample. This work clarifies the luminescence properties of Eu²⁺ ions in BaSiO₃ and Ba₂ SiO₄ hosts.