5 November 2002 Photorefractive organic glasses based on a new chromophore with minimized aggregation tendency
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A photorefractive (PR) organic glass based on the chromophore IDOP-20 is reported. The electronic structure of this merocyanine dye was tuned close to the cyanine limit to optimize the anisotropy of the linear polarizability δα and to achieve a large PR figure-of-merit. The carefully chosen aliphatic side chains of the chromophore prevent dipolar aggregation even at very high concentrations in liquid solution and provide excellent compatibility with polymer matrices. IDOP-20 also forms a stable glass with glass transition temperature of Tg=58o C. Mixtures with the plasticizer DPP were prepared to adjust the glass transition temperature close to room temperature. Such mixtures showed PR response after sensitization with TNFM where sensitization occurred through a CT band between TNFM and IDOP-20 and charge transport was supported by the multifunctional by IDOP-20. A PR glass of composition IDOP-20:DPP:TNFM 69:30:1 wt% was studied by a complete set of holographic-optical experiments (two-beam coupling and four-wave mixing), (photo)conductivity measurements and ellipsometric measurements. The performance of the new PR glasses is discussed with respect to similar materials based on the ATOP chromophore. The (mono-exponential) response time of the material is strongly temperature dependent and limited by chromophore reorientation.
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Ruediger W. Wortmann, Ruediger W. Wortmann, Mesfin Redi-Abshiro, Mesfin Redi-Abshiro, Ulrich Roesch, Ulrich Roesch, Sheng Yao, Sheng Yao, Frank Wuerthner, Frank Wuerthner, } "Photorefractive organic glasses based on a new chromophore with minimized aggregation tendency", Proc. SPIE 4802, Organic Photorefractive and Photosensitive Materials for Holographic Applications, (5 November 2002); doi: 10.1117/12.453483; https://doi.org/10.1117/12.453483

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