Synthesis and photoluminescence properties of Eu2+-doped Ca2AlSi3O2N5 green phosphors

Novel Eu2+-doped Ca2AlSi3O2N5 phosphors with a general formula of EuxCa2−xAlSi3O2N5 were successfully prepared via a solid-state reaction method under a nitrogen atmosphere. The produced phosphors were effectively excited by UV–vis light in the wavelength range between 250 and 400 nm, and featured an intense green emission band which peaked at about 500 nm. The emission spectra featured a red-shift over increasing Eu2+ content and the temperature of heat treatment. The maximum intensity of emission was obtained for x = 0.014 and heat treatment at 1450 °C. The photoluminescence properties of the produced Ca2AlSi3O2N5:Eu2+ phosphors qualify them for consideration in potential use as green phosphors in UVLED-based white LED.