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J. Korean Ceram. Soc. > Volume 51(1); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(1): 25-31.
doi: https://doi.org/10.4191/kcers.2014.51.1.025
열처리 분위기가 Eu 이온이 첨가된 Li-Al-O계 형광체 특성에 미치는 영향
김정석, 천채일1, 채기웅1
호서대학교 디스플레이공학과
1호서대학교 신소재공학과
Effect of Heat-treatment Atmosphere on Photoluminescence of Eu-doped Li-Al-O System
Jeong Seog Kim, Chae Il Cheon1, Ki-Woong Chae1
Department of Display Engineering, Hoseo University
1Department of Materials Science and Engineering, Hoseo University
ABSTRACT
New green phosphor is synthesized by reducing $LiAlO_2:xEu^{3+}$ phosphors in a low pressure $H_2$ atmosphere. The $LiAlO_2:xEu^{3+}$ prepared by a solid state reaction method is reported as red phosphor. The effect of the reduction treatment on the $LiAlO_2:xEu^{3+}$ 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 $1100^{circ}C$. 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 $Li_2Al_4O_7$ was observed at $1100^{circ}C$. The origin of the green-light emission is discussed in relation to the crystalline phase change.
Key words: Phosphor, Europium, Lithium aluminate, Reduction atmosphere
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