Giant magnetoresistance of photoconductive polymer film

Tadaaki Ikoma, Toshinari Ogiwara, Yutaka Takahashi, Kimio Akiyama, Shozo Tero-Kubota

Research output: Contribution to conferencePaperpeer-review


Electron spin is a subject of study that is attracting interest in the modern technology of organic electronics. It is recognized, for example, that the triplet state plays an important role in the efficient emission from electro-luminescent materials. Also, there has been a great interest in the spin effect in conductors from a view point of spintronics. Using various magnetic resonance experiments, we have studied the carrier generation mechanism of electron acceptor-doped poly(N-vinylcarbazole) (PVCz) thin films. It has been concluded that the photocarrier is generated by stepwise hole hops on a quasi-one dimensional lattice model in which the hole transfers among the nearest carbazole sites while holding the electron spin angular momentum. Based on the fact that the photoinduced geminate e-h pair plays an important role for the carrier generation, in this paper, the doping effect on the magnetoresistance of photoconductive PVCz films has been investigated. Even at room temperature, giant magnetoresistance was induced by lumichrome dopant that generated a spin-polarized triplet state through anisotropic intersystem crossing from the photoexcited singlet state.

Original languageEnglish
Number of pages2
Publication statusPublished - 2006 Dec 1
Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
Duration: 2006 Sept 202006 Sept 22


Other55th Society of Polymer Science Japan Symposium on Macromolecules


  • Giant magnetoresistance
  • Photoconductive polymer film
  • Photoinduced spin polarization/radical pair mechanism
  • Triplet electron-hole pair

ASJC Scopus subject areas

  • Engineering(all)


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