Photorefractivity in nematic liquid crystals using a donor-acceptor dyad with a low-lying excited singlet state for charge generation

Michael J. Fuller, Michael R. Wasielewski

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30 Citations (Scopus)

Abstract

The photorefractive effect was observed in room-temperature nematic liquid crystal composites consisting of a eutectic mixture of 65% 4′-(n-pentyl)-4-cyanobiphenyl and 35% 4′-(n-octyloxy)-4-cyanobiphenyl doped with a donor-acceptor dyad in which 9-(N-pyrrolidinyl)]perylene-3,4-dicarboximide is directly linked to 1,8: 4,5-naphthalenetetracarboxydiimide. This dyad has a broad, intense absorption band that extends from 500 to 750 nm. Measurements of two-beam asymmetric energy exchange (beam-coupling) and the diffraction efficiency of the refractive index grating produced in these liquid crystal thin films were carried out. A comparison is made between the covalent donor-acceptor dyad and the corresponding noncovalent donor-acceptor pair. In each case the covalent dyad outperforms the noncovalent donor-acceptor pair. The results show that aminoaryleneimides are promising new charge donating chromophores that are capable of extending photorefractive performance of nematic liquid crystal composites into the near-infrared region of the spectrum.

Original languageEnglish
Pages (from-to)7216-7219
Number of pages4
JournalJournal of Physical Chemistry B
Volume105
Issue number30
DOIs
Publication statusPublished - Aug 2 2001

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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