Photochemical stability of nonlinear optical chromophores in polymeric and crystalline materials |
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Authors: | Rezzonico Daniele Kwon Seong-Ji Figi Harry Kwon O-Pil Jazbinsek Mojca Günter Peter |
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Institution: | Nonlinear Optics Laboratory, Swiss Federal Institute of Technology, ETH Zurich, CH-8093 Zürich, Switzerland. nlo@phys.ethz.ch |
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Abstract: | We compare the photochemical stability of the nonlinear optical chromophore configurationally locked polyene 2-{3-2-(4-dimethylaminophenyl)vinyl]-5,5-dimethylcyclohex-2-enylidene} malononitrile (DAT2) embedded in a polymeric matrix and in a single-crystalline configuration. The results show that, under resonant light excitations, the polymeric compound degrades through an indirect process, while the DAT2 crystal follows a slow direct process. We show that chromophores in a crystalline environment exhibit three orders of magnitude better photostability as compared to guest-host polymer composites. |
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