Molecular engineering of discotic liquid crystals is discussed with relation to charge carrier mobility and generation efficiency. Steady State DC and Pulsed TOF measurements are reported as viable complementary methods in the determination of charge generation efficiencies. Data for the quantum efficiencies of charge carrier generation in 2,3,6,7,10,11-hexa(hexyloxy)triphenylene and its 1:1 mixture with 2,3,6,7,10,11-hexakis(nonylphenyl)triphenylene (a complementary polytopic interaction (CPI) stabilized compound) are presented. The wavelength, field and temperature dependence of the quantum efficiency of charge carrier generation are discussed in respect of the Onsager theory of geminate recombination.
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