A novel single-substrate Sr2Ga2SiO7:Tb3+ green phosphor for full-spectrum white LED

Abstract

A series of novel silicate green phosphors Sr_2-xGa₂SiO₇: xTb³⁺ (with x ranging from 0.01 to 0.06) were successfully synthesized by the high-temperature solid-state reaction technique. The samples were analyzed for their phase morphology, luminescent properties, concentration quenching, thermal stability, fluorescence lifetime and CIE chromaticity coordinates. Under the excitation of 370 nm ultraviolet light, the phosphors exhibited strong green emission characteristics. Analysis of the emission spectra of different concentration of samples determined that the optimal doping concentration is x = 0.04, at which the samples exhibit the best luminescent performance. Additionally, these samples demonstrated high thermal stability, at 453 K, the luminous intensity retains 88.3% of its initial value at room temperature. The research results suggest that Sr₂Ga₂SiO₇:Tb³⁺ green phosphors have significant application potential, particularly in addressing the narrow emission spectrum limitations of conventional WLEDs and fluorescence-based marking technologies.