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13 November 2000 Variation of the glass transition temperature in organic photorefractive materials: plasticizer versus novel synthetic approaches
Andre Leopold, Uwe Hofmann, M. Grasruck, Stephan J. Zilker, Dietrich Haarer, Jolita Ostrauskaite, Juozas V. Grazulevicius, Mukundan Thelakkat, Christoph Hohle, Peter Strohriegl, Hans-Werner Schmidt, Andreas Bacher, Donal D. C. Bradley, M. Redecker, Michael Inbasekaran, Weishi W. Wu, Edmund P. Woo
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Proceedings Volume 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites; (2000) https://doi.org/10.1117/12.406472
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States
Abstract
Most photorefractive (PR) materials require plasticizers in order to decrease the glass transition temperature, allowing for orientational enhancement by the chromophores. Introduction of the plasticizer, however, alters not only the viscosity but also the photoconductive properties of the material. This can be shown by comparing two different plasticizers which were introduced into a bifunctional low-molecular-weight PR glass and into a polyfluorene guest-host polymer. The latter reaches response times down to 600 microsecond(s) at a writing intensity of 1 W/cm2. We have recently improved the concept of low-molecular-weight PR glasses. A suitable, photoconducting unit allows the synthesis of a bifunctional system with a glass transition of 22.6 degree(s)C. Therefore, no plasticizer is needed. The material is based on a triphenyldiamine (TPD) moiety to which a nonlinear-optical chromophore is directly attached. The system is the first representative of a whole class of TPD molecules and polymers for photorefractive applications.
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Andre Leopold, Uwe Hofmann, M. Grasruck, Stephan J. Zilker, Dietrich Haarer, Jolita Ostrauskaite, Juozas V. Grazulevicius, Mukundan Thelakkat, Christoph Hohle, Peter Strohriegl, Hans-Werner Schmidt, Andreas Bacher, Donal D. C. Bradley, M. Redecker, Michael Inbasekaran, Weishi W. Wu, and Edmund P. Woo "Variation of the glass transition temperature in organic photorefractive materials: plasticizer versus novel synthetic approaches", Proc. SPIE 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites, (13 November 2000); https://doi.org/10.1117/12.406472
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KEYWORDS
Glasses
Chromophores
Molecules
Holography
Refractive index
Modulation
Photoresistors
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