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Effect of Electronic States of Triphenylamine Derivatives on Their Charge Transport Properties

The hole drift mobilities of polymers doped with triphenylamine derivatives have been measured and the effect of the electronic states of triphenylamine derivatives on the charge transport properties has been studied. The HOMO (highest occupied molecular orbital) distribution strongly affects the charge transport properties and it was found that when the triphenylamine part had more HOMO distribution, the mobility increased. Moreover, 2-[p-di(p-tolyl)aminostyryl]-4-methylthiazole was found as a new charge transport material having rather high drift mobility.