Synthesis and photoluminescent properties of titanate layered oxides intercalated with lanthanide cations by electrostatic self-assembly methods.
Synthesis and photoluminescent properties of titanate layered oxides intercalated with lanthanide cations by electrostatic self-assembly methods.
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DOI：
10.1021/jp0517089
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发表时间：
2005-06
期刊：
影响因子：
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通讯作者：
Y. Matsumoto;U. Unal;Y. Kimura;S. Ohashi;K. Izawa
中科院分区：
文献类型：
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作者：
Y. Matsumoto;U. Unal;Y. Kimura;S. Ohashi;K. Izawa
采用静电自组装沉积（ESD）和层层自组装（LBL）方法，将不同的镧系离子插层到剥离的H（x）Ti（（2-x）/4）（x/4）O（4）xH（2）O（HTO）的层间. X射线衍射和热分析结果表明，在室温条件下，层间镧系离子以水离子形式存在，并与7-10个水分子配位。发现层间距离在6-7埃的范围内的HTO层状氧化物插入镧系元素阳离子。通过紫外可见光谱和X射线衍射研究了LBL法对镧系离子的插层行为。并对其光致发光特性进行了详细的讨论。Eu（3+）插层氧化物在室温下具有较强的红光发射。层间水分子的存在被发现是不可避免的高强度的发射。在100%RH条件下处理的膜的发射强度显著高于在5%RH条件下处理的膜。在镧系离子周围的层间层中的受限水分子的类冰行为被认为是对发射机制的重要贡献。在几种条件下获得的数据说明和解释的机制。
Various lanthanide cations were intercalated into the interlayer of the exfoliated H(x)Ti((2-x)/4)) square(x/4)O(4) x H(2)O (HTO) by the electrostatic self-assembly deposition (ESD) and layer-by-layer self-assembly (LBL) methods. X-ray diffraction and thermal analysis data indicated that interlayer lanthanide cations existed as an aqua ion and were coordinated with 7-10 water molecules under ambient conditions. The interlayer distances were found to be in the range 6-7 Angstrom for HTO layered oxide intercalated with a lanthanide cation. Intercalation of lanthanide cations into the interlayer by the LBL method was monitored by UV-vis spectrum and X-ray diffraction. Photoluminescence properties were also discussed in detail. Eu(3+) intercalated layered oxide exhibited intense red emission at room temperature. The presence of interlayer water molecules was found to be inevitable for the emission with high intensity. The emission intensity was significantly higher for the films conditioned at 100% RH than those at 5% RH. The icelike behavior of the confined water molecules in the interlayer around lanthanide cations was believed to be contributing highly to the emission mechanism. The mechanism was illustrated and explained by data obtained under several conditions.