Abstract
Blue-emitting phosphors (Gd1-xCex)5Si3O12N (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.
Original language | English |
---|---|
Pages (from-to) | 330-336 |
Number of pages | 7 |
Journal | Materials Research Bulletin |
Volume | 88 |
DOIs | |
State | Published - 1 Apr 2017 |
Keywords
- Ce
- Luminescence
- Oxynitride
- Quenching