Preparation and luminescence of a novel red phosphor BaY₄Si₃O₁₃:Eu³⁺ and effect of Li₂CO₃ doping

A novel red phosphor BaY₄Si₃O₁₃:Eu³⁺ (BYSO:Eu³⁺) was designed and prepared through a high-temperature solid-phase method in this work. It was found that the addition of Li₂CO₃ in the synthesis process could significantly decrease the sintering temperature and increase the intensity and purity of red emission, as more lower symmetry sites were occupied by Eu³⁺. The optimum preparation conditions of BYSO:Eu³⁺ were obtained as sintering at 1350 °C for 3h with the doping of 18% Eu³⁺and 5% Li₂CO₃. The CIE chromaticity coordinate was (0.636,0.362) and color purity reached 91.56% at room temperature, and 53.93% of the initial PL intensity could be retained when the temperature rose up to 453 K. The results showed that BYSO:Eu³⁺ had greatly potential application in white LED deriving from the great red emission.