Photoluminescence properties of color-tunable KLaSiO4:Ce3+,Mn2+ phosphors

A series of color-tunable KLaSiO4:Ce3+,Mn2+ phosphors were successfully prepared and the luminescent properties were investigated. Upon excitation at 290 nm, the emission spectra of KLaSiO4:Ce3+,Mn2+ phosphors included a blue emission band and a red emission band. Increasing the doping concentration of Mn2+ ions, the red emission was strengthened considerably, and the blue emission of Ce3+ was reduced, owing to the efficient energy transfer. The composition optimized KLa0.96SiO4:0.02Ce3+,0.02Mn2+ sample exhibited the white light emission brightly with the chromaticity coordinates of (0.331, 0.337). Therefore, KLaSiO4:Ce3+, Mn2+ could be used as a white phosphor candidate for white light-emitting diodes devices.

Emission spectra of Ce3+ and Mn2+ in the KLa(0.98-y)SiO4: 0.02Ce3+,yMn2+ (0=y=0.10) phosphors with various Mn2+ concentrations under an excitation wavelength of 290 nm (the inset shows the energy levels diagram of the Ce3+-Mn2+ couple)Figure optionsDownload as PowerPoint slide