Abstract: Stationary photocurrrent in phenyl substituted polyphenylenevinylene (PhPPV) and hexabenzocoronene(HBC) doped by perylenediimide(PDI) in a broad range of PDI mass fractions was investigated by steady state photocurrent measurements and using thin films in a light-emitting devices sandwich structure. It is shown that at and above the moderate mass fractions the yield of the charge photogeneration carriers is almost independent of the system and the mass fractions of dopant. As PDI mass fractions >10%,the photogeneration quantum yield increases by two to three orders of magnitude by comparing with the pure system.

Key words: Doped system, Photogeneration carriers, Photocurrent