Structural and luminescent properties of Sr2SiO4 phosphors doped with Eu2+ and Ce3+ ions for advanced LED applications

Eu2+ and Ce3+ ions with different concentrations of single/co-doped Sr2SiO4 phosphors have been successfully prepared using a high-temperature solid-state reaction. The influences of Eu2+ and Ce3+ ions on the construction and optical performance behavior of Sr2SiO4 have been investigated by X-ray diffraction (XRD), Fourier Transform Infrared Spectrometer (FTIR), scanning electron microscope (SEM), ultra-violet-visible (UV-Vis), and photoluminescence (PL) spectral analyses. XRD results revealed that the doping ions have entered the host lattice, and SEM showed the crystallite sizes have been found to vary from 1 to 6 μm. The intensity of the absorption spectra for the co-doped samples was larger than that of the single-doped sample. PL spectra displayed that the emission intensity of the samples strengthened as the amount of concentrations of Eu2+ and Ce3+ ions. The concentration quenching of single/co-doped phosphors was related to dipole-dipole interaction, and the energy from the 2F5/2 transition to the 5D level of Ce3+ was effectively transferred to the 4f65d level of Eu2+. The Eu2+ and Ce3+ ions co-doping samples resulted in a light green color. The findings from the study reveal that the Eu2+ and Ce3+ ions single/co-doped Sr2SiO4 phosphors would be potential candidates for the LED application.