A Ce 3+ -activated fluorosulfide phosphor (β-YFS:Ce 3+ ) was synthesized by solid-state reaction in a sealed tube. The crystal structure has been refined from the XRD profiles and there are two different crystallographic rare earth sites, namely, Y(1) and Y(2), where the Ce 3+ ions occupied. The emission band with a maximum at 495 nm of β-Y 0.99 Ce 0.01 FS phosphor was characterized by the 4f-5d transitions of Ce 3+ ion. With increasing Ce 3+ concentration, the emission variations were observed from 495 to 547 nm. When β-YFS:Ce 3+ phosphors were utilized to incorporate with n-UV/blue chip, greenish-white light with color rendering index of 65-77 were obtained. The results indicate that the tunable green- to yellow-emitting β-YFS:Ce 3+ can serve as a potential phosphor for incorporation in fabrication for solid-state lighting. The preparation, spectroscopic characterization, quantum efficiency, thermal-quenching behavior, and related LED device data are also presented.