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Proceedings Paper

Photorefractive polymers with low intrinsic trap density
Author(s): Henk J. Bolink; Victor V. Krasnikov; Georges Hadziioannou
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Paper Abstract

Two novel photorefractive polymers are presented, based on the charge transport molecule N,N'-diphenyl-N,N'- bis(3-methylphenyl)-{1,1'-biphenyl]-4,4'-diamine (TPD). In one polymer the TPD unit is chemically modified so that it can function both as charge transport and as electro-optic molecule. In the other polymer the TPD is incorporated into the polymeric backbone and provides the charge transport and functions as a host for the dispersed electro-optic molecules. In both types of polymers the trap density is very low, which causing a 900 phase shift between the refractive index grating and the illumination pattern and a rather small photorefractive performance. The trap density can in the case of the bifunctional molecule based polymer be increased by adding small amounts of N,N,N',N'-tetramethyl-paraphenylene diamine (TMPD) which has a lower ionization energy than the bifunctional molecule. This results in a strong increase of photorefractive performance and simultaneously in a lowering of the phase-shift. The ionization energy of some molecules used in photorefractive polymers is determined using gas-phase ultraviolet photoelectron spectroscopy and cyclovoltammetry. Using these ionization energies the process of the space-charge field formation can be understood on the basis of the components of the photorefractive polymer.

Paper Details

Date Published: 9 October 1997
PDF: 10 pages
Proc. SPIE 3144, Xerographic Photoreceptors and Organic Photorefractive Materials II, (9 October 1997); doi: 10.1117/12.290232
Show Author Affiliations
Henk J. Bolink, Univ. of Groningen (Netherlands)
Victor V. Krasnikov, Univ. of Groningen (Netherlands)
Georges Hadziioannou, Univ. of Groningen (Netherlands)

Published in SPIE Proceedings Vol. 3144:
Xerographic Photoreceptors and Organic Photorefractive Materials II
Stephen Ducharme; Stephen Ducharme; James W. Stasiak, Editor(s)

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