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Synthesis and Spectroscopie Analysis of Smart Photochromic Materials

Published online by Cambridge University Press:  10 February 2011

Yeon-Gon Mo ,
R. O. Dillon  and
P. G. Snyder
Yeon-Gon Mo
Affiliation:
Department of Electrical Engineering and Center for Microelectronic and Optical Materials Research, University of Nebraska, Lincoln, NE, 68588
R. O. Dillon
Affiliation:
Department of Electrical Engineering and Center for Microelectronic and Optical Materials Research, University of Nebraska, Lincoln, NE, 68588
P. G. Snyder
Affiliation:
Department of Electrical Engineering and Center for Microelectronic and Optical Materials Research, University of Nebraska, Lincoln, NE, 68588
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Abstract

Sol-gel processing was used to dope photochromic materials into metal alkoxide-polymer and pure polymer materials. The films on silicon and quartz substrates were examined, with and without UV irradiation, by UV/VIS spectroscopy, ellipsometry and FTIR.

The UV/VIS spectroscopy showed that the doped matrices were photochromic in the visible and near infrared.

The ellipsometric data were obtained with a variable angle of incidence spectroscopie ellipsometer (VASE). The Cauchy and a combined Cauchy-Lorentz model were used to fit the unirradiated and irradiated films, respectively. The optical constants of the films showed significant changes upon irradiation. This means that the absorption coefficient and hence the emissivity of the films is being modulated with UV irradiation. The VASE-fitted thicknesses of the films were in the range of 1 to 6 microns.

In the FTIR spectra, the spiropyran doped samples have shown IR transmission changes in the two spectral regions (6–7 μm and 7.5–8.5 μm) where changes are expected due to band opening. The transmission ratio for UV irradiated to unirradiated samples decreased by as much as about 24% at aparticular IR wavelength.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 93
Copyright
Copyright © Materials Research Society 1997

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