Tuning magnetoresistance and magnetic-field-dependent electroluminescence through mixing a strong-spin-orbital-coupling molecule and a weak-spin-orbital-coupling polymer

Yue Wu, Zhihua Xu, Bin Hu, Jane Howe

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Abstract

We report a tunable magnetoresistance by uniformly mixing strong-spin-orbital-coupling molecule fac-tris (2-phenylpyridinato) iridium [Ir(ppy) 3] and weak-spin-orbital-coupling polymer poly (N -vinyl carbazole) (PVK). Three possible mechanisms, namely charge transport distribution, energy transfer, and intermolecular spin-orbital interaction, are discussed to interpret the Ir(ppy) 3 concentration-dependent magnetoresistance in the PVK+Ir(ppy) 3 composite. The comparison between the magnetic field effects measured from energy-transfer and nonenergy-transfer Ir(ppy) 3 doped polymer composites indicates that energy transfer and intermolecular spin-orbital interaction lead to rough and fine tuning for the magnetoresistance, respectively. Furthermore, the photocurrent dependence of magnetic field implies that the excited states contribute to the magnetoresistance through dissociation. As a result, the modification of singlet or triplet ratio of excited states through energy transfer and intermolecular spin-orbital interaction form a mechanism to tune the magnetoresistance in organic semiconducting materials.

Original languageEnglish (US)
Article number035214
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number3
DOIs
StatePublished - Jan 31 2007

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Electroluminescence
Magnetoresistance
electroluminescence
Polymers
Tuning
Energy transfer
tuning
Magnetic fields
orbitals
Molecules
energy transfer
polymers
magnetic fields
molecules
Excited states
Magnetic field effects
Iridium
composite materials
carbazoles
Composite materials

Cite this

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title = "Tuning magnetoresistance and magnetic-field-dependent electroluminescence through mixing a strong-spin-orbital-coupling molecule and a weak-spin-orbital-coupling polymer",
abstract = "We report a tunable magnetoresistance by uniformly mixing strong-spin-orbital-coupling molecule fac-tris (2-phenylpyridinato) iridium [Ir(ppy) 3] and weak-spin-orbital-coupling polymer poly (N -vinyl carbazole) (PVK). Three possible mechanisms, namely charge transport distribution, energy transfer, and intermolecular spin-orbital interaction, are discussed to interpret the Ir(ppy) 3 concentration-dependent magnetoresistance in the PVK+Ir(ppy) 3 composite. The comparison between the magnetic field effects measured from energy-transfer and nonenergy-transfer Ir(ppy) 3 doped polymer composites indicates that energy transfer and intermolecular spin-orbital interaction lead to rough and fine tuning for the magnetoresistance, respectively. Furthermore, the photocurrent dependence of magnetic field implies that the excited states contribute to the magnetoresistance through dissociation. As a result, the modification of singlet or triplet ratio of excited states through energy transfer and intermolecular spin-orbital interaction form a mechanism to tune the magnetoresistance in organic semiconducting materials.",
author = "Yue Wu and Zhihua Xu and Bin Hu and Jane Howe",
year = "2007",
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day = "31",
doi = "10.1103/PhysRevB.75.035214",
language = "English (US)",
volume = "75",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
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TY - JOUR

T1 - Tuning magnetoresistance and magnetic-field-dependent electroluminescence through mixing a strong-spin-orbital-coupling molecule and a weak-spin-orbital-coupling polymer

AU - Wu, Yue

AU - Xu, Zhihua

AU - Hu, Bin

AU - Howe, Jane

PY - 2007/1/31

Y1 - 2007/1/31

N2 - We report a tunable magnetoresistance by uniformly mixing strong-spin-orbital-coupling molecule fac-tris (2-phenylpyridinato) iridium [Ir(ppy) 3] and weak-spin-orbital-coupling polymer poly (N -vinyl carbazole) (PVK). Three possible mechanisms, namely charge transport distribution, energy transfer, and intermolecular spin-orbital interaction, are discussed to interpret the Ir(ppy) 3 concentration-dependent magnetoresistance in the PVK+Ir(ppy) 3 composite. The comparison between the magnetic field effects measured from energy-transfer and nonenergy-transfer Ir(ppy) 3 doped polymer composites indicates that energy transfer and intermolecular spin-orbital interaction lead to rough and fine tuning for the magnetoresistance, respectively. Furthermore, the photocurrent dependence of magnetic field implies that the excited states contribute to the magnetoresistance through dissociation. As a result, the modification of singlet or triplet ratio of excited states through energy transfer and intermolecular spin-orbital interaction form a mechanism to tune the magnetoresistance in organic semiconducting materials.

AB - We report a tunable magnetoresistance by uniformly mixing strong-spin-orbital-coupling molecule fac-tris (2-phenylpyridinato) iridium [Ir(ppy) 3] and weak-spin-orbital-coupling polymer poly (N -vinyl carbazole) (PVK). Three possible mechanisms, namely charge transport distribution, energy transfer, and intermolecular spin-orbital interaction, are discussed to interpret the Ir(ppy) 3 concentration-dependent magnetoresistance in the PVK+Ir(ppy) 3 composite. The comparison between the magnetic field effects measured from energy-transfer and nonenergy-transfer Ir(ppy) 3 doped polymer composites indicates that energy transfer and intermolecular spin-orbital interaction lead to rough and fine tuning for the magnetoresistance, respectively. Furthermore, the photocurrent dependence of magnetic field implies that the excited states contribute to the magnetoresistance through dissociation. As a result, the modification of singlet or triplet ratio of excited states through energy transfer and intermolecular spin-orbital interaction form a mechanism to tune the magnetoresistance in organic semiconducting materials.

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U2 - 10.1103/PhysRevB.75.035214

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