Synthesis and characterization of Mn-activated lithium aluminate red phosphors

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• 作者：Masahiro Aoyama^a ; Yusuke Amano^a ; Koji Inoue^b ; Sawao Honda^a ; Shinobu Hashimoto^c ; Yuji Iwamoto^a ; ^{iwamoto.yuji@nitech.ac.jp}
• 关键词：Lithium aluminate ; Sol&ndash ; gel method ; Mn4+-activated red phosphor ; ESR spectroscopic analyses
• 刊名：Journal of Luminescence
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：136
• 期：Complete
• 页码：411-414
• 全文大小：1782 K

文摘

Mn-doped LiAlO₂ powders were synthesized by the sol-gel method. The crystalline phase of the sol-gel-derived host lithium aluminate could be successfully controlled as ¦Á-LiAlO₂ single phase by heat treatment at 700 ¡ãC. The results of electron spin resonance spectroscopic analyses revealed that Mn ions existed as isolated Mn⁴⁺ and clustered cations in the host ¦Á-LiAlO₂ matrix, and a part of the isolated Mn⁴⁺ were thought to substitute the Al³⁺ octahedral sites. The red emission peaks derived from d-d transitions of the Mn⁴⁺ (3d³) configuration from ²E to ⁴A₂ were observed around 670 nm. The emission intensity increased consistently with the Mn-doping concentration, and the highest intensity was achieved at the Mn-doping of 0.10 mol. At and above 0.10 mol Mn-doping, the concentration quenching was observed. Based on these results, the relationships between the crystalline phases of the LiAlO₂ phosphor matrix, amount of the doped-manganese, and the photoluminescence properties were discussed from a viewpoint to develop a novel ¦Á-LiAlO₂:Mn⁴⁺ red phosphor.