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.