Photorefractive properties of TNFM-sensitized PVK-based polymer composites and fully functionalized polymethacrylates

Eric Hendrickx, David Van Steenwinckel, Christiaan Engels, Elke Gubbelmans, Kurt Van den Broeck, David Beljonne, Jean Luc Bredas, Celest Samyn, Andre Persoons

Research output: Contribution to journalConference articlepeer-review


We have studied the photorefractive properties of (2,4,7-trinitro-9-fluorenylidene)malononitrile (TNFM) sensitized poly(N-vinylcarbazole)/N-ethylcarbazole polymer composites doped with 2-(3,5,5-trimethylhex-2-ene-1-ylidene)-1,3-propanedinitrile and related dyes. Characterization included four-wave mixing experiments, two-beam coupling and photoconductivity measurements at a wavelength of 780 nm. At an applied field of 53 V/μm, we have observed complete internal diffraction and at 68 V/μm a gain coefficient of 230 cm-1. Small alterations in the chromophore donor group substituents were used to tune the ionization potential of the dopant dye by 0.3 eV. They affected the grating build-up time, photorefractive phase shift, and complexation with TNFM. This performance is compared to that of three newly synthesized polymethacrylates functionalized with carbazole, a dodecyl chain as an internal plasticizer and three different dyes. Here we observe net two-beam coupling gain and a diffraction efficiency of 60% at 58 V/μm.

Original languageEnglish (US)
Pages (from-to)130-139
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2000
Externally publishedYes
EventOrganic Photorefractives, Photoreceptors, and Nanocomposites - San Diego, CA, USA
Duration: Jul 31 2000Aug 1 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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