6 March 2013 Processing of organic electro-optic materials: solution-phase assisted reorientation of chromophores
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Abstract
Organic EO materials, sometimes called EO polymers, offer a variety of very promising properties that have improved at remarkable rates over the last decade, and will continue to improve. However, these materials rely on a “poling” process to afford EO activity, which is commonly cited as the bottleneck for the widespread implementation of organic EO material-containing devices. The Solution Phase-Assisted Reorientation of Chromophores (SPARC) is a process that utilizes the mobility of chromophores in the solution phase to afford acentric molecular order during deposition. The electric field can be generated by a corona discharge in a carefully-controlled gas environment. The absence of a poling director during conventional spin deposition forms centric pairs of chromophores which may compromise the efficacy of thermal poling. Direct spectroscopic evidence of linear dichroism in modern organic EO materials has estimated the poling-induced order of the chromophores to be 10-15% of its theoretical maximum, offering the potential for a manyfold enhancement in EO activity if poling is improved. SPARC is designed to overcome these limitations and also to allow the poling of polymeric hosts with temporal thermal (alignment) stabilities greater than the decomposition temperature of the guest chromophore. In this report evidence supporting the theory motivating the SPARC process and the resulting EO activities will be presented. Additionally, the results of trials towards a device demonstration of the SPARC process will be discussed.
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Benjamin C. Olbricht, David L. K. Eng, Stephen T. Kozacik, Dylan Ross, Dennis W. Prather, "Processing of organic electro-optic materials: solution-phase assisted reorientation of chromophores", Proc. SPIE 8622, Organic Photonic Materials and Devices XV, 86220U (6 March 2013); doi: 10.1117/12.2005394; https://doi.org/10.1117/12.2005394
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