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

Abstract Luminescent materials composed of Sr 3− x −3 y /2 M x Ce y AlO 4 F (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 Ce 3+ -activated oxyfluoride phosphors are clearly monitored. The critical emission quenching as a function of Ce 3+ contents in Sr 2.5−3 y /2 M 0.5 Ce y AlO 4 F phosphors is revealed at quite low concentrations of the activator. CIE coordinates of blue and green Sr 2.5−3 y /2 M 0.5 Ce y AlO 4 F phosphors are clearly measured. The relative quantum efficiency of Sr 2.4985 Ca 0.5 Ce 0.005 AlO 4 F based on the integrated emission is determined. The Sr 3− x −3 y /2 M x Ce y AlO 4 F phosphors excited near 410 nm light could be prominent phosphors in applications of NUV-LED.

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