Photoluminescence and quantum yields of organic/inorganic hybrids prepared through formic solvolysis
Photoluminescence and quantum yields of organic/inorganic hybrids prepared through formic solvolysis
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DOI：
10.1016/j.optmat.2007.05.011
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发表时间：
2008-03-01
影响因子：
3.9
通讯作者：
Carlos, L. D.
中科院分区：
文献类型：
--
作者：
Fu, Lianshe;Ferreira, R. A. Sa;Carlos, L. D.
以甲酸为溶剂，通过羧酸溶剂解溶胶-凝胶法制备了三种不同长度的POE/硅氧烷杂化材料，即双脲硅（diureasil）。通过X射线衍射、傅里叶变换中红外光谱、Si-29和交叉极化C-13魔角旋转核磁共振和光致发光光谱对所得杂化物进行了表征。杂化物的结构基本上与聚合物链长无关，并且材料是室温白光发射体，其发射量子产率类似于10 +/- 1%，寿命平均值在2和4 ns之间。对于具有短聚合物链的双脲硅基质，溶剂分解方法相对于常规溶胶-凝胶路线有利于PL量子产率的增加。(c)2007 Elsevier B. V.保留所有权利。
Three undoped di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid matrices, classed as di-ureasils, incorporating POE segments with different lengths were prepared through the carboxylic acid solvolysis sol-gel method using formic acid. The resulting hybrids were characterized by X-ray diffraction, Fourier transform mid-infrared spectroscopy, Si-29 and cross-polarization C-13 magic-angle spinning nuclear magnetic resonance and photoluminescence spectroscopy. The hybrids' structure is essentially independent of the polymer chain length and the materials are room temperature white-light emitters with emission quantum yields of similar to 10 +/- 1% and lifetime average values between 2 and 4 ns. For the di-ureasil host with short polymer chains the solvolysis method favours the increase of the PL quantum yields relatively to conventional sol-gel route. (c) 2007 Elsevier B.V. All rights reserved.