Enhanced optical nonlinearity and improved transparency of inorganic-organic hybrid materials containing benzimidazole chromophores.
Enhanced optical nonlinearity and improved transparency of inorganic-organic hybrid materials containing benzimidazole chromophores.
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DOI：
10.1021/jp9048549
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Jiancan Yu;Yuanjing Cui;Junkuo Gao;Zhiyu Wang;G. Qian
中科院分区：
文献类型：
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作者：
Jiancan Yu;Yuanjing Cui;Junkuo Gao;Zhiyu Wang;G. Qian
采用湿化学方法，设计并合成了一系列以苯并咪唑生色团为侧基的无机-有机杂化材料。溶剂化显色法和紫外-可见光谱的测量结果表明，这些苯并咪唑类发色团与其苯环类似物相比，具有更高的微观光学非线性，且吸收带没有发生不希望的红移。经电晕极化后，通过原位二次谐波测量研究了杂化薄膜的宏观非线性光学活性和极化取向稳定性。这些杂化膜在发色团浓度变化的情况下表现出从25到54 pm/V的增强的非线性光学系数、改善的光学透明度（λ（max）< 470 nm）以及在160 ℃下优异的极性取向稳定性。
A series of novel inorganic-organic hybrid materials with benzimidazole chromophores covalently bonded into the inorganic silica network as pendants has been designed and synthesized via the wet chemistry routes. The measurement results of solvatochromic method and UV-vis spectra indicate that these benzimidazole chromophores exhibit higher microscopic optical nonlinearity compared with their analogues with benzene ring and without undesirable red-shift of the absorption band. After corona poling, the macroscopic nonlinear optical activity and poling alignment stability of the hybrid films were investigated by in situ second harmonic generation measurement. These hybrid films exhibit enhanced nonlinear optical coefficient from 25 to 54 pm/V with chromophore concentration varied, improved optical transparency (lambda(max) < 470 nm), as well as excellent polar orientation stability at 160 degrees C.