C alpha-alpha-SiAlON : Eu2+ phosphors used for white LEDs were synthesized by one-step LPP-CRN method. Crystalline cellulose was used as a carbon source for synthesizing C alpha-alpha-SiAlON : Eu2+ phosphors. This phosphor emits yellow to orange light. This phosphor showed a single broad band emission attributed to the 5d --> f transition of Eu2+ ions. The synthesized yellow-to orange-emitting phosphors obtained without using excess carbon were crystallized much effectively and showed higher emission intensity. This phosphor obtained using the LPP-CRN method is expected to lead to the synthesis of other oxynitride phosphors and to be applied to white LEDs.

Keywords: C alpha-alpha-SiAlON : Eu2+ phosphor; White LEDs; LPP-CRN method