Nondispersive hole transport of liquid crystalline glasses and a cross-linked network for organic electroluminescence

S. R. Farrar; A. E.A. Contoret; M. O'Neill; J. E. Nicholls; G. J. Richards; S. M. Kelly

Nondispersive hole transport of liquid crystalline glasses and a cross-linked network for organic electroluminescence

S. R. Farrar, A. E.A. Contoret, M. O'Neill, J. E. Nicholls, G. J. Richards, S. M. Kelly

Research output: Contribution to journal › Article › peer-review

Abstract

Photocurrent time-of-flight experiments are used to study the transport properties of hole-conducting nematic liquid crystals. Nondispersive transients are observed and a value of 4 × 10^-4 cm²V^-1s^-1 is found for the hole mobility of a chiral nematic glass at room temperature. The hole mobility of a reactive mesogen in the nematic glass phase is increased by photopolymerization of its reactive end chains to form an insoluble network. The mobility of the network shows a weak field dependence over the temperature range 295-373 K. The experimental data can be explained by hopping between the nematic cores using a Gaussian disorder model that includes spatial correlations in the carrier energy. The density-of-state distribution obtained from the model agrees with that measured spectroscopically.

Original language	English
Article number	125107
Pages (from-to)	1251071-1251075
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	12
Publication status	Published - 2002 Sept 15
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Nondispersive hole transport of liquid crystalline glasses and a cross-linked network for organic electroluminescence",

abstract = "Photocurrent time-of-flight experiments are used to study the transport properties of hole-conducting nematic liquid crystals. Nondispersive transients are observed and a value of 4 × 10-4 cm2V-1s-1 is found for the hole mobility of a chiral nematic glass at room temperature. The hole mobility of a reactive mesogen in the nematic glass phase is increased by photopolymerization of its reactive end chains to form an insoluble network. The mobility of the network shows a weak field dependence over the temperature range 295-373 K. The experimental data can be explained by hopping between the nematic cores using a Gaussian disorder model that includes spatial correlations in the carrier energy. The density-of-state distribution obtained from the model agrees with that measured spectroscopically.",

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AU - Farrar, S. R.

AU - Contoret, A. E.A.

AU - O'Neill, M.

AU - Nicholls, J. E.

AU - Richards, G. J.

AU - Kelly, S. M.

PY - 2002/9/15

Y1 - 2002/9/15

N2 - Photocurrent time-of-flight experiments are used to study the transport properties of hole-conducting nematic liquid crystals. Nondispersive transients are observed and a value of 4 × 10-4 cm2V-1s-1 is found for the hole mobility of a chiral nematic glass at room temperature. The hole mobility of a reactive mesogen in the nematic glass phase is increased by photopolymerization of its reactive end chains to form an insoluble network. The mobility of the network shows a weak field dependence over the temperature range 295-373 K. The experimental data can be explained by hopping between the nematic cores using a Gaussian disorder model that includes spatial correlations in the carrier energy. The density-of-state distribution obtained from the model agrees with that measured spectroscopically.

AB - Photocurrent time-of-flight experiments are used to study the transport properties of hole-conducting nematic liquid crystals. Nondispersive transients are observed and a value of 4 × 10-4 cm2V-1s-1 is found for the hole mobility of a chiral nematic glass at room temperature. The hole mobility of a reactive mesogen in the nematic glass phase is increased by photopolymerization of its reactive end chains to form an insoluble network. The mobility of the network shows a weak field dependence over the temperature range 295-373 K. The experimental data can be explained by hopping between the nematic cores using a Gaussian disorder model that includes spatial correlations in the carrier energy. The density-of-state distribution obtained from the model agrees with that measured spectroscopically.

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Nondispersive hole transport of liquid crystalline glasses and a cross-linked network for organic electroluminescence

Abstract

ASJC Scopus subject areas

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