Electromodulation and magnetomodulation of exciton dissociation in electron donor (starburst amine): electron acceptor (bathocuproine) system

摘要

Electric field dependencies of electromodulated photoluminescence and photocurrents as well as the magnetic field effects on photocurrents, photovoltaic characteristics, electromodulated photoluminescence and photoluminescence have been investigated in vacuum evaporated films of m-MTDATA:BCP (4,4',4"-tris(N-(3-methylphenyl)-N-phenylamino)triphenylamine and bathocuproine) system. The electromodulation processes do remain in accordance with Onsager as well as with the Sano-Tachiya-Noolandi-Hong formalisms of electron-hole pair separation. While the electromodulated photocurrents are due to operation of both long-radius and short-radius e-h pairs, the electromodulated photoluminescence quenching is related to merely short-radius fraction of the e-h pairs involved in the exciplex creation process. The photocurrents, photovoltaic characteristics, photoluminescence and electromodulated photoluminescence are influenced by external magnetic field of the hyperfine coupling (HFC) scale which modulates the singlet-triplet intersystem crossing of long-radius e-h pairs.