Luminescence properties of Sr3−x−3y/2MxCeyAlO4F (M=Ca, Ba, 0≤x≤0.9, 0.001≤y≤0.05) phosphors

Luminescent materials composed of Sr3−x−3y/2MxCeyAlO4F (M=Ca, Ba, 0≤x≤0.9, 0.001≤y≤0.05) were prepared by the solid-state reaction method. X-ray diffraction (XRD) patterns of the obtained oxyfluorides are exhibited for indexing peak positions. Dynamic excitation and emission spectra of the Ce3+-activated oxyfluoride phosphors are clearly monitored. The critical emission quenching as a function of Ce3+ contents in Sr2.5−3y/2M0.5CeyAlO4F phosphors is revealed at quite low concentrations of the activator. CIE coordinates of blue and green Sr2.5−3y/2M0.5CeyAlO4F phosphors are clearly measured. The relative quantum efficiency of Sr2.4985Ca0.5Ce0.005AlO4F based on the integrated emission is determined. The Sr3−x−3y/2MxCeyAlO4F phosphors excited near 410 nm light could be prominent phosphors in applications of NUV-LED.