Electronic mobility, columnar discotics

Photoconductive properties are observed for some discotic molecules having abundant it electrons [16-20]. For example, triphenylene derivatives can show high charge carrier mobility in the hexagonal columnar (Colh) LC phase due to their ordered molecular packing [16-20,43-45]. 

Where, Ep is the average energy required to produce an electron-hole pair and P is the fraction of charge carriers that survive until the end of the pulse. The values of P are estimated according to a model that describes scavenging of the charge carriers by the aromatic cores of the columnar structures formed by the discotic molecules, see for example ref [14], Since JZftTRMc is measured in three dimensions, the intracolumnar mobility parallel to the columns JZb io is three times as big. 

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