Effect of Cu2+ ions on the photoluminescence characteristics of Ce4+-doped SrAl2O4

Abstract Cu-doped, Ce-doped and CuCe-doped SrAl 2 O 4 luminescent materials have been synthesized by solid state reaction at 1200 °C and weak oxidation atmosphere. The photoluminescence (PL) and excitation spectra of the doped samples have been investigated at room temperature. The excitation spectrum of Ce 4+ -doped SrAl 2 O 4 sample consists of two sharp bands, one in the ultraviolet (381 nm) and the other in the visible (517 nm) part of the spectrum. The PL spectra of Ce 4+ -doped SrAl 2 O 4 sample vary with the changing of the excitation wavelength. Because of the energy transfer between Cu 2+ and Ce 4+ , the PL and excitation spectra of the sample co-doped with Cu 2+ and Ce 4+ are dramatically different from that of Ce 4+ -doped sample. Also, the PL spectra of the co-doped sample change with using different excitation wavelength.