Preparation and luminescence properties of Ce3+-doped Gd5Si3O12N phosphor emerging red shift

초록

Blue-emitting phosphors (Gd1-xCex)(5)Si3O12N (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 Ce3+ concentration had on the photoluminescence of the prepared samples was examined, and the results indicate that an increase in the Ce3+ concentration introduces a red-shift of the emission peak due to an increase in the Stokes shift. Concentration quenching occurs when the Ce3+ content exceeds 3 mol%. In addition, the configurational coordinate model was used to finely explain the thermal quenching behavior of the phosphors. (C) 2017 Elsevier Ltd. All rights reserved.

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