Eur. Phys. J. Appl. Phys.
Volume 68, Number 3, December 2014
|Number of page(s)||9|
|Section||Physics of Organic Materials and Devices|
|Published online||25 November 2014|
Charge carrier trapping in highly-ordered lyotropic chromonic liquid crystal films based on ionic perylene diimide derivatives
Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauky 46, 03028
2 Center for Physical Sciences and Technology, Savanoriu 231, LT-02300 Vilnius, Lithuania
3 Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska 5, 02660 Kyiv, Ukraine
4 IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
a e-mail: email@example.com
Revised: 21 September 2014
Accepted: 26 September 2014
Published online: 25 November 2014
Charge carrier trapping in thin films of lyotropic chromonic liquid crystals (LCLCs) based on ionic perylene diimide derivative and in chemically-similar neutral N,N′-dipentyl-3,4,9,10-perylene-dicarboximide (PTCDI-C5) films is investigated by thermally-stimulated luminescence (TSL) technique. The LCLC films comprise elongated molecular aggregates featuring a long-range orientational order. The obtained results provide direct evidence for the improved energetic ordering (smaller effective energetic disorder) in aggregated LCLC films as compared to conventional PTCDI-C5 films. The width of the density-of-state distribution of 0.09 eV and 0.13 eV was estimated for the LCLC and PTCDI-C5 films, respectively. Relatively small effective energetic disorder in LCLC films is ascribed to formation of macroscopically larger LCLC aggregates.
© EDP Sciences, 2014
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