Synthesis and luminescent properties of a white light phosphor KBa2Nb5O15:Na+, Dy3+ for light-emitting-devices

The white light emission phosphor KBa2Nb5O15:Dy3+ was synthesized by solid-state method. X-ray diffraction (XRD) study reveals that all the Dy3+ doped phosphors are single phase. Strong excitation peaks of KBa2Nb5O15:Dy3+ were found around 380–400 nm, matched well with the NUV LED chip. Under 388 nm excitation, the phosphor exhibited intense white emission by combining the two emission peaks at 477 nm and 572 nm, attributed to the characteristic 4F9/2–6H15/2 and 4F9/2–6H13/2 transition of Dy3+. The optimum doping concentration of Dy3+ is found to be 3%, whose Commission International de l’ Eclairage (CIE) chromaticity coordinates and correlated color temperature are (0.395, 0.422) and 3925 K, respectively. The results indicate that the KBa2Nb5O15:Dy3+ phosphor could be considered as a potential candidate for white-LEDs.