Photochromism of spiropyran nanocrystals embedded in sol-gel matrices |
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Authors: | Spagnoli Sylvie Block Dominique Botzung-Appert Estelle Colombier Isabelle Baldeck Patrice L Ibanez Alain Corval Anne |
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Institution: | Laboratoire de Spectrométrie Physique, Université Joseph Fourier, CNRS, BP 87, 38402, St Martin d'Hères Cedex, France. spagnoli@spectro.ujf-grenoble.fr |
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Abstract: | Spectroscopic and kinetic properties of a new photochromic medium, consisting of nanocrystals of spyropyran molecules (1,3-dihydro-1,3,3,5',6',pentamethyl-spiro2H-indole-2,2'-2H]pyrano 3,2-b]pyridinium] iodide) embedded in an organo-silicate sol-gel film, are presented and compared to microcrystals obtained by slow evaporation of a solvent. High photoconversion efficiencies for both kinds of crystals have been observed. In microcrystals, the photomerocyanine form absorbs at 570 nm with a fading rate of 5 h, in nanocrystals the photomerocyanine form absorbs at 535 nm with a fading rate of 41 h. Therefore, the crystalline structure of nanocrystals is different from the microcrystal one. |
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