Co-precipitation synthesis and luminescence properties of K sub(2)TiF sub(6):Mn super(4+) red phosphors for warm white light-emitting diodes

K sub(2)TiF sub(6):Mn super(4+ ) red phosphors with different Mn super(4+) doping concentrations were obtained using the co-precipitation method. X-Ray diffraction, scanning electron microscopy, Raman spectra, Fourier transform infrared spectroscopy, photoluminescence excitation and emission spectra and decay curves were used to characterize the properties of K sub(2)TiF sub(6):Mn super(4+) phosphors. Under excitation at 470 nm, an intense red emission peak around 631 nm corresponding to the super(2)E sub(g)- super(4)A sub(2) transition of Mn super(4+) was observed for 2.48 mol% K sub(2)TiF sub(6):Mn super(4+) phosphors and was used as the optimum doping concentration. The excellent luminescent properties of K sub(2)TiF sub(6):Mn super(4+) suggest that this material might be a promising red phosphor for generating warm white light in phosphor-converted white light-emitting diodes.