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 journalArticlepeer-review

61 Citations (Scopus)

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 languageEnglish
Article number125107
Pages (from-to)1251071-1251075
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number12
Publication statusPublished - 2002 Sep 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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