Abstract
An intense blue-emitting phosphor KBaPO 4:Eu 2+ was synthesized by a solid-state reaction method. The crystal structure of KBaPO 4:Eu 2+ was refined using neutron diffraction data by Rietveld refinement for the first time. KBa 0.99Eu 0.01PO 4 composition shows intense blue emission (peak wavelength, 420 nm) with relative intensity vs commercial BaMgAl 10O 17:Eu 2+ blue phosphor (Nichia) 65%, 122% and 108% under 147, 254 and 365 nm excitation, respectively. In addition, by applying a nano-sized silica coating on the phosphor surface, excellent moisture resistance of KBP:Eu 2+ was obtained. Due to its intense blue emission and excellent color purity (0.1606, 0.0271), it is very potent as a blue-emitting phosphor for PDPs, CCFLs, and pc-white LEDs based on near UV LED.
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