The cyan-green luminescent behaviour of nitrided Ba9Y2Si6O24: Eu2+ phosphors for W-LED

The nitrided Ba9Y2Si6O24: Eu2+ phosphors were prepared by the conventional high temperature solid state reaction. Si3N4 doping obviously improves the luminescent intensity compared with undoped phosphors. The Eu2+ emitting lights in different Ba2+ crystal lattices and its temperature dependent luminescence properties from 293 to 453 K are discussed. Under the 410 nm excitation, the nitrided Ba9Y2Si6O24:Eu2+ has more thermal stability than other same crystal structure of Ba9M2Si6O24:Eu2+ (M = Sc, Lu, Y). The nitriding schemes can significantly improve the luminescence properties of the phosphors, and nitrided Ba9Y2Si6O24: Eu2+ can be an excellent candidate as a green phosphor for W-LEDs.