A novel blue-emitting NaSrPO4:Eu2+ phosphor for near UV based white light-emitting-diodes

Abstract A novel blue-emitting phosphor based on a phosphate host matrix, NaSrPO 4 :Eu 2+ , was prepared by a conventional solid-state reaction method. The NaSrPO 4 :Eu 2+ phosphor was efficiently excited at wavelengths of 250–450 nm, which is suitable for the emission band of near ultraviolet (n-UV) light-emitting-diode (LED) chips (350–430 nm). The NaSrPO 4 :Eu 2+ phosphor exhibits a strong blue emission peaking at 453 nm and broadly weak green and red emission bands up to 700 nm. The effect of the activated Eu 2+ concentration on the emission intensity of the NaSrPO 4 :Eu 2+ was also investigated. Here, a phosphor-converted LED (pc-LED) was fabricated and exhibits bright blue emission under a forward bias of 20 mA. All of these characteristics suggest that the NaSrPO 4 :Eu 2+ phosphors could be applicable to n-UV based white LEDs.