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New green phosphor is synthesized by reducing LiAlO2 : xEu 3+ phosphors in a low pressure H₂ atmosphere. The LiAlO₂ : xEu 3+ prepared by a solid state reaction method is reported as red phosphor. The effect of the reduction treatment on the LiAlO₂ : xEu 3+ on the crystalline phase change and photoluminescence (PL) property are characterized. The reduced phosphor had a broad green light spectrum centered at 524 nm. The PL intensity of the reduced phosphor increased to a maximum at the reduction temperature of 1100℃. The PL intensity decreased with a further increase in the reduction temperature. The crystalline phase constituting the reduced phosphor varied with the temperature. A new crystalline phase Li₂Al₄O 7 was observed at 1100℃. The origin of the green-light emission is discussed in relation to the crystalline phase change.

Effect of Heat-treatment Atmosphere on Photoluminescence of Eu-doped Li-Al-O System