title: Long-range jump versus stepwise hops: magnetic field effects on the charge-transfer fluorescence from photoconductive polymer films.
abstract: Magnetic field effects on the charge-transfer (CT) fluorescence of a 1,2,4,5-tetracyanobenzene-doped poly(N-vinylcarbazole) thin film were investigated to clarify the primary process in photoconductive organic amorphous solid. The CT fluorescence increased with increasing magnetic field until 10 mT, and then it showed the dip around 40-50 mT. The hyperfine coupling mechanism observed in the low field and the level-crossing mechanism observed around 46 mT clearly indicate that the spin-conservative stepwise hole hops take place in the films. The boundary distance determined from the simulation based on the stepwise hopping model almost agreed with the interionic separation estimated within the Onsager analysis.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Fuyuki
authors.initials: F
authors.lastname: Ito
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Ikoma
authors.forename: Kimio
authors.initials: K
authors.lastname: Akiyama
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kobori
authors.forename: Shozo
authors.initials: S
authors.lastname: Tero-Kubota