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Preparation of Sr 2 Si 5 N 8 :Eu 2+ phosphors using various novel reducing agents and their luminescent properties

2009; IOP Publishing; Volume: 1; Linguagem: Inglês

10.1088/1757-8981/1/1/012024

1757-899X

Takashi Horikawa, Xianqing Piao, Masahiro Fujitani, H. Hanzawa, K. Machida,

Gas Sensing Nanomaterials and Sensors

Divalent europium-doped metal nitride phosphors, Sr2Si5N8:Eu2+, were synthesized using three novel reducing agents, C3H6N6, C2H4N4, and Sr(CH3COO)2. The samples obtained showed higher emission intensity and lower residual oxygen/carbon content as compared with the sample prepared by the conventional carbothermal reduction and nitridation (CRN) method. A maximum emission intensity of 155% relative to that of the commercially available YAG:Ce3+ (P46-Y3) standard phosphor was achieved using the Sr(CH3COO)2 route. White LEDs fabricated using synthesized phosphors emitted white light with a correlated color temperature in the range 2900–6300 K. Moreover, a general color rendering index (Ra) of 80 was obtained. The reducing methods in this study were shown to be more effective than the conventional CRN route; these phosphors can be used to compensate for a red color deficiency of the current white LED.