PECULIARITIES OF RADIATIVE RECOMBINATION IN AMORPHOUS MOLECULAR SEMICONDUCTORS DOPED WITH POLYMETHINE DYE

Processes of charge carrier photogeneration and recombination are inve stigated in films of poly-M epoxypropylcarbazole doped with polymethin e dye. Films with blocking contacts were illuminated with right from e ither the region of dye absorption or beyond this region. The kinetics of accumulation and relaxation of electron-hole pairs with lifetimes greater than tens or hundreds of seconds was studied. It is presumed t hat the reason for the growth of recombination luminescence intensity in an external electric field is connected with the increase in effici ency of radiative recombination stimulated by electrons captured from photogenerated excitons. (C) 1998 John Wiley & Sons, Ltd.