Novel red phosphor Ba0.3Sr0.7SiO3:Eu3+ with excellent quantum yield and thermal stability

Developing high-performance red phosphors remains an urgent issue in the field of green lighting. In this work, a novel red phosphors Ba0.3Sr0.7-xSiO3:xEu3+(0.02 ≤ x ≤ 0.12, Δx=0.02) were successfully synthesized by high-temperature solid-state reaction, and systematically studied theirs crystal structure, microstructure, fluorescence spectrum, thermal stability, fluorescence lifetime, and chromaticity coordinates. The phosphors are all monoclinic crystal system, and space group is C12/c1. It is inferred from the chemical bond theory that Eu3+ occupies the site of Sr2+ in the matrix. The emission spectrum of Ba0.3Sr0.64SiO3:0.06Eu3+ exhibits strong 5D0→7F4 (702nm) emission, which made its color purity as high as 97.1756 %. Additionally, The quantum yield of Ba0.3Sr0.64SiO3:0.06Eu3+ phosphor is as high as 88.60 %, and it exhibits excellent thermal stability with the thermal activation energy Ea = 0.3893 eV. Therefore, Ba0.3Sr0.7SiO3:Eu3+ phosphors can be an ideal candidate material for white LED.