Charge transport of novel blue dibenzothiophene phenylenediamine copolymer

In this paper, the charge transport characteristics of dibenzothiophene phenylenediamine copolymer (DBT-PD), which is a 50:50 molar ratio random copolymer consisting of DBT and a hole-transporting phenylenediamine group with tertiarybutyl substituents was studied. The quoted ratio is of the starting monomers introduced into the reaction and may change slightly after polymerization due to differences in reactivity, possible side reactions. Arylamine moieties of the type used are extensively utilised in LED and photodetector materials due to their very good hole transport properties, low ionisation potentials and overall stability to oxidation. The hole transport in DBT-PD was investigated at a series of electric fields and temperatures via Time-of-Flight measurement.The data from the study of the electric-field and temperature dependence of the hole transport are then fitted to Bassler´s Gaussian Disorder Model in order to compare the 4 microscopic disorder parameters.