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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Lanthanide molecular-based hybrids covalently bonded with silica: Photoluminescence and control of micromorphology
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Lanthanide molecular-based hybrids covalently bonded with silica: Photoluminescence and control of micromorphology

机译：与二氧化硅共价键合的镧系元素分子杂化物：光致发光和微观形貌控制

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摘要

The syntheses of modified 5-bromonicotinic acid by (3-aminopropyl)triethoxysilane and the preparation of their corresponding organic-inorganic molecular-based hybrid material with the two components equipped with covalent bonds are described. The organic moiety is a derivative of 5-bromonicotinic acid which is applied to coordinate to RE3+ and further introduced into silica matrices by Si-O bonds after hydrolysis and polycondensation processes. Judd-Ofelt theory proves that covalency increases along with increasing reciprocal energy difference between the 4fN and 4fN-15d1configurations. Ultraviolet absorption, phosphorescence and luminescence spectra were utilized to characterize the photophysical properties of the obtained hybrid material and the above spectroscopic data reveal that the triplet energy of modified 5-bromonicotinic acid matches with the emissive energy level of RE3+. In this way, the intramolecular energy transfer process took place within these molecular-based hybrids and strong green, red or blue emissions of RE3+ have been acquired. Scanning electronic microscope presents no phase separation phenomenon appear and the different crystal structures of lanthanide complex precursor molecules have influence on the microstructure and micromorphology of corresponding molecular hybrids. (c) 2006 Elsevier B.V. All rights reserved.
机译：描述了由（3-氨基丙基）三乙氧基硅烷合成的改性5-溴烟酸及其制备的相应的有机-无机分子基杂化材料，其中两种组分均带有共价键。有机部分是5-溴烟酸的衍生物，其用于配位至RE3 +，并在水解和缩聚过程后通过Si-O键进一步引入到二氧化硅基质中。 Judd-Ofelt理论证明，共价性随着4fN和4fN-15d1构型之间倒数能量差的增加而增加。利用紫外吸收，磷光和发光光谱来表征所获得的杂化材料的光物理性质，并且以上光谱数据表明，改性的5-溴烟酸的三重态能量与RE 3+的发射能级匹配。以这种方式，分子内能量转移过程发生在这些基于分子的杂化体中，并且已经获得了强烈的绿色，红色或蓝色RE3 +发射。扫描电子显微镜没有出现相分离现象，镧系元素络合物前驱体分子的不同晶体结构对相应分子杂种的微观结构和微观形态有影响。 （c）2006 Elsevier B.V.保留所有权利。

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