Conversion of Valence State and Coordination State of Fe in Transparent Glass-Ceramics Containing Li2ZnSiO4 Nanocrystals
Conversion of Valence State and Coordination State of Fe in Transparent Glass-Ceramics Containing Li2ZnSiO4 Nanocrystals
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DOI：
10.1111/jace.12398
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发表时间：
2013-09
影响因子：
3.9
通讯作者：
Yixi Zhuang;S. Tanabe
中科院分区：
文献类型：
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作者：
Yixi Zhuang;S. Tanabe
采用熔淬法制备了含Li2ZnSiO4:Fe纳米晶透明微晶玻璃，并进行了后处理。制备的玻璃和微晶玻璃表现出以730nm为中心的红至近红外光致发光，这归因于四面体配位的Fe3+离子。通过两种简单的技术提高了光致发光强度：利用氧化剂将铁的价态从Fe2+控制为Fe3+，而通过陶瓷化过程将配位态从八面体强制转换为四面体对称。Fe2+离子的存在被认为是Fe3+光致猝灭的主要原因。Fe2+的氧化和Fe2+离子转化为四面体对称有助于抑制从Fe3+发射体到Fe2+淬火中心的能量转移。
Transparent glass-ceramics containing Li2ZnSiO4:Fe nanocrystals were prepared by melt-quenching method followed by post-heat-treatment process. The as-prepared glasses and glass-ceramics showed red to near-infrared photoluminescence centered at 730 nm, ascribed to Fe3+ ions in tetrahedral coordination. The intensity of the photoluminescence was enhanced by two technologically simple techniques—the valence state of irons was controlled from Fe2+ to Fe3+ ions using oxidizing agents, whereas the coordination state was compulsorily converted from octahedral to tetrahedral symmetry by performing a ceramization process. The presence of Fe2+ ions was considered a major origin for Fe3+ photoluminescence quenching. Oxidation of Fe2+ and conversion of Fe2+ ions into tetrahedral symmetry contribute to suppression of energy transfer from Fe3+ emitters to Fe2+ quenching centers.