Preparation, Photophysical Characterization, and Modeling of LDS722/Laponite 2D-Ordered Hybrid Films

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• 作者：Nerea Epelde-Elezcano ; Eduardo Duque-Redondo ; Virginia Mart铆nez-Mart铆nez ; Hegoi Manzano ; I帽igo L贸pez-Arbeloa
• 刊名：Langmuir
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：30
• 期：33
• 页码：10112-10117
• 全文大小：391K
• ISSN：1520-5827

文摘

A novel hybrid material with promising optical properties for nonlinear optical applications is presented, as formed by LDS 722 organic dye confined in Laponite clay. Thin films of the hybrid material with different dye loadings have been prepared. The film thickness, the dye and water content, and the clay swelling due to guest molecule incorporation have been characterized. Then, the photophysical properties of the thin films have been studied in detail using experimental methods and molecular simulation. As the dye load increases, the hybrid films present a hypsochromic shift in absorption and a bathochromic shift in emission. The former is attributed to the increasing strength of solvation of the dye donor group, while the latter is ascribed to a switch from an intramolecular to an intermolecular charge-transfer process as the dye load increases. The LDS 722 molecules are preferentially oriented in the host clay almost in parallel to the platelet surfaces, inducing macroscopic order that makes the material responsive to polarized light.