Abstract
ABSTRACTWe investigated the photoluminescence-excitation spectrum and the hole mobility of solvent-extracted CTP (coal tar pitch). The hole mobility increased with more ordered CTP as judged by the ID/IG ratio. In addition, anisole-insoluble CTPs with different softening points were also characterized. The chloroform- or DMSO-extract from the anisole-insoluble CTP with the higher softening point showed the more molecular order and the higher hole mobility than those of the CTP with the lower softening point. By using the CTP with the higher softening point, the highest hole mobility of 9.9 × 10−5 cm2/Vs was observed when the dye extracted with DMSO from the anisole-insoluble CTP was used.
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