Preparation and luminescence properties of Ce 3+ -doped Gd 5 Si 3 O 12 N phosphor emerging red shift

Abstract Blue-emitting phosphors (Gd 1- x Ce x ) 5 Si 3 O 12 N (0 ≤ x ≤ 0.07) were prepared through a solid-state reaction under a reducing atmosphere. The excitation spectra exhibited several broad bands in the wavelength range from 240 to 400 nm, and the emission spectra consisted of a broad band covering from 360 to 550 nm. Two different emission centers corresponding to two different crystallographic sites in the host lattice were confirmed. The influence that the Ce 3+ concentration had on the photoluminescence of the prepared samples was examined, and the results indicate that an increase in the Ce 3+ concentration introduces a red-shift of the emission peak due to an increase in the Stokes shift. Concentration quenching occurs when the Ce 3+ content exceeds 3 mol%. In addition, the configurational coordinate model was used to finely explain the thermal quenching behavior of the phosphors.