Publication

Photorefractive polymers with low intrinsic trap density

Bolink, HJ., Krasnikov, VV. & Hadziioannou, G., 1997, XEROGRAPHIC PHOTORECEPTORS AND ORGANICS PHOTOREFRACTIVE MATERIALS II. Ducharme, S. & Stasiak, JW. (eds.). BELLINGHAM: SPIE - INT SOC OPTICAL ENGINEERING, p. 124-133 10 p. (PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE); vol. 3144).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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 90 degrees 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.

Original languageEnglish
Title of host publicationXEROGRAPHIC PHOTORECEPTORS AND ORGANICS PHOTOREFRACTIVE MATERIALS II
EditorsS Ducharme, JW Stasiak
Place of PublicationBELLINGHAM
PublisherSPIE - INT SOC OPTICAL ENGINEERING
Pages124-133
Number of pages10
ISBN (Print)0-8194-2566-4
Publication statusPublished - 1997
EventConference on Xerographic Photoreceptors and Organic Photorefractive Materials II - , Canada
Duration: 28-Jul-199729-Jul-1997

Publication series

NamePROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
PublisherSPIE - INT SOC OPTICAL ENGINEERING
Volume3144

Other

OtherConference on Xerographic Photoreceptors and Organic Photorefractive Materials II
CountryCanada
Period28/07/199729/07/1997

Event

Conference on Xerographic Photoreceptors and Organic Photorefractive Materials II

28/07/199729/07/1997

Canada

Event: Other

    Keywords

  • photorefractive polymers, TPD, ionization energy, charge trapping

ID: 6498017