Magnetic field effect on photocurrent in N,N'-di(naphthalene-l-yl)-N,N'- diphenyl-benzidine (NPB)

B. K. Li, W. J. Chen, M. K. Lam, Kok Wai CHEAH, J. N. Wang

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3 Citations (Scopus)

Abstract

We studied organic magnetoresistance (OMAR) and magneto-photocurrent (MPC) in ITO/N,N'-di(naphthalene-l-yl)-N,N'-diplienyl-benzidine (NPB)/A1 sandwich devices with NPB thicknesses of 50 nm. Without illumination, no OMAR is observable. While the MPC curves are found to have different line shapes containing a low field and a high field component, depending on excitation photon energy and applied bias. The analysis of experimental results indicate that: (i) the magnetic field effects in NPB is associated with excitonic states, and (ii) the dissociation of singlet excitons is associated to the high field component and triplet-exciton-charge interaction is to the low field component in MPC curves.

Original languageEnglish
Article number012109
JournalJournal of Physics: Conference Series
Volume193
DOIs
Publication statusPublished - 2009

Scopus Subject Areas

  • Physics and Astronomy(all)

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