Preparation of hybrid mesoporous silica luminescent nanoparticles with lanthanide(III) complexes and their exhibition of white emission.
Preparation of hybrid mesoporous silica luminescent nanoparticles with lanthanide(III) complexes and their exhibition of white emission.
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DOI：
10.1039/c1dt10779h
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发表时间：
2011-09
影响因子：
4
通讯作者：
Daojun Zhang;Duihai Tang;Xuemin Wang;Zhen‐An Qiao;Yantao Li;Yunlin Liu;Q. Huo
中科院分区：
文献类型：
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作者：
Daojun Zhang;Duihai Tang;Xuemin Wang;Zhen‐An Qiao;Yantao Li;Yunlin Liu;Q. Huo
我们选择吡啶二羧酸作为具有ONO供体的三齿螯合单元与镧系元素（III）离子反应，以在镧系元素（III）离子周围产生紧密和保护性的N（3）O（6）环境。采用共价键接枝法将稀土-吡啶二甲酸配合物固定在粒径小于100 nm的介孔二氧化硅上，得到了近单分散发光的Eu-dpa-Si和Tb-dpa-Si杂化介孔二氧化硅纳米材料。这些杂化纳米材料的特征在于粉末X射线衍射，扫描电子显微镜，透射电子显微镜，热重分析，氮吸附-脱附，和光致发光光谱技术。杂化介孔二氧化硅纳米粒子在紫外光照射下表现出强烈的发射线，这是由于从发色团到中心镧系元素Eu（3+）和Tb（3+）离子的有效分子内能量转移。此外，功能化纳米材料在高温下退火后可以变成白色光材料。
We chose dipicolinic acid as a tridentate chelating unit featuring ONO donors to react with lanthanide(III) ions to yield tight and protective N(3)O(6) environments around the lanthanide(III) ions. We immobilized the lanthanide(III)-dipicolinic acid complexes on colloidal mesoporous silica with diameter smaller than 100 nm by a covalent bond grafting technique and obtained nearly monodisperse luminescent Eu-dpa-Si and Tb-dpa-Si functionalized hybrid mesoporous silica nanomaterials. These hybrid nanomaterials were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, nitrogen adsorption-desorption, and photoluminescence spectroscopic techniques. The hybrid mesoporous silica nanoparticles exhibit intense emission lines upon UV-light irradiation, owing to the effective intramolecular energy transfer from the chromophore to the central lanthanide Eu(3+) and Tb(3+) ions. Furthermore, the functionalized nanomaterials can be turned to white light materials after annealing at high temperature.