Energy Transfer and Emission Quantum Yields of Organic−Inorganic Hybrids Lacking Metal Activator Centers
Energy Transfer and Emission Quantum Yields of Organic−Inorganic Hybrids Lacking Metal Activator Centers
复制标题
DOI：
10.1021/jp0668448
复制
发表时间：
2007-01
影响因子：
3.7
通讯作者：
S. Nobre;P. P. Lima-P.;L. Mafra;R. Ferreira;R. O. Freire;L. Fu;U. Pischel;V. Bermudez;and Oscar L. Malta;L. Carlos
中科院分区：
文献类型：
--
作者：
S. Nobre;P. P. Lima-P.;L. Mafra;R. Ferreira;R. O. Freire;L. Fu;U. Pischel;V. Bermudez;and Oscar L. Malta;L. Carlos
这项工作定量地讨论了发生在溶胶-凝胶衍生的胺和酰胺官能化的杂化物的白光发射的能量转移机制。白光光致发光（PL）是由有机/无机交联的NH/CO基团中产生的发射与硅氧烷纳米团簇中发生的电子-空穴复合的卷积产生的，这两种发射都是典型的供体-受体对。合成了两种模型化合物，分别再现了两种混合物的发射，并通过X射线衍射，29 Si/1H/13 C魔角旋转NMR，漫反射，傅里叶变换-IR和光致发光光谱进行了表征，以支持它们作为混合物的两种对应物的有机和无机结构模型的使用。比较了无机和有机模型化合物的两种发射寿命与杂化物的寿命，杂化物中硅相关寿命的Arrhenius温度依赖性，以及杂化物中硅的非线性发射寿命。
This work discusses quantitatively the energy transfer mechanism that occurs in the white-light emission of sol−gel derived amine- and amide-functionalized hybrids. The white-light photoluminescence (PL) results from a convolution of the emission originated in the NH/CO groups of the organic/inorganic cross-links with electron-hole recombinations occurring in the siloxane nanoclusters, both emissions typical of donor−acceptor pairs. Two model compounds that reproduce separately the two hybrid's emissions were synthesized and characterized by X-ray diffraction, 29Si/1H/13C magic-angle spinning NMR, diffuse reflectance, Fourier transform−IR, and photoluminescence spectroscopy to support their use as organic and inorganic structural models for the two counterparts of the hybrids. The comparison between the lifetimes of the two emissions of the inorganic and organic model compounds with those of the hybrids, the Arrhenius dependence with temperature of the siliceous-related lifetime in the hybrids, and the no...