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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photorefractivity
Nematic liquid crystals
Excited states
Perylene
liquid crystals
Liquid Crystals
Diffraction efficiency
Diffraction gratings
Composite materials
Chromophores
Liquid crystals
Eutectics
excitation
Absorption spectra
Refractive index
composite materials
Infrared radiation
eutectics
Thin films
chromophores

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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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.",
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N2 - 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.

AB - 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.

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