Photorefractive materials, molecular glasses

For typical NLO-phores the (ju, ) 6a term is much larger than the p,gl3 term. The molar polarizabilities (113) and (114) were recently used to derive a molecular figure of merit (FOM) for NLO-phores for organic photorefractive (PR) materials with low glass-transition temperature (Wortmann et al., 1996). Rational design of NLO-phores based on this FOM led to organic PR-materials with unprecedented performance (Wtirthner et al., 1997). 

The photorefractive performance of high-molecular-weight PVK-based composites can be enhanced by optimizing the composition of the PVK composites [73]. 2,4,7-Trinitrofluorenone is used as sensitizer material. The improved performance arises due to a large orientational enhancement effect with faster response speed in addition to samples with an appropriate glass transihon temperature. 

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