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Title: Magnetic Field-Dependent Electroluminescence in Organic Polymer with Ferromagnetic Cobalt Nanocluster Electrode

Abstract

We report a spin-polarized hole injection into organic semiconductor poly[2-methoxy-5-(2{prime}-ethylhexyloxy)-1,4-]phenylenevinylene (MEHPPV) layer from cobalt (Co) nanoscale clusters based on electroluminescence (EL) studies at liquid nitrogen temperature. The magnetic field effect on EL intensity indicates that the spin injection essentially increases the singlet-to-triplet exciton ratio in organic semiconductors. The Co size-dependent EL shows that the spin-injection efficiency decreases rapidly when the Co clusters percolate to a continuous film. The thickness-dependent EL enhancement of magnetic field suggests that the diffusion length of spin-polarized holes is about 60 nm in the MEHPPV.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences; High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931942
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 75; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COBALT; DIFFUSION LENGTH; EFFICIENCY; ELECTRODES; ELECTROLUMINESCENCE; EXCITONS; MAGNETIC FIELDS; NITROGEN; ORGANIC POLYMERS; ORGANIC SEMICONDUCTORS; SPIN

Citation Formats

Wu, Yue, Li, An-Ping, Howe, Jane Y, Shen, Jian, and Hu, Bin. Magnetic Field-Dependent Electroluminescence in Organic Polymer with Ferromagnetic Cobalt Nanocluster Electrode. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.75.075413.
Wu, Yue, Li, An-Ping, Howe, Jane Y, Shen, Jian, & Hu, Bin. Magnetic Field-Dependent Electroluminescence in Organic Polymer with Ferromagnetic Cobalt Nanocluster Electrode. United States. doi:10.1103/PhysRevB.75.075413.
Wu, Yue, Li, An-Ping, Howe, Jane Y, Shen, Jian, and Hu, Bin. Mon . "Magnetic Field-Dependent Electroluminescence in Organic Polymer with Ferromagnetic Cobalt Nanocluster Electrode". United States. doi:10.1103/PhysRevB.75.075413.
@article{osti_931942,
title = {Magnetic Field-Dependent Electroluminescence in Organic Polymer with Ferromagnetic Cobalt Nanocluster Electrode},
author = {Wu, Yue and Li, An-Ping and Howe, Jane Y and Shen, Jian and Hu, Bin},
abstractNote = {We report a spin-polarized hole injection into organic semiconductor poly[2-methoxy-5-(2{prime}-ethylhexyloxy)-1,4-]phenylenevinylene (MEHPPV) layer from cobalt (Co) nanoscale clusters based on electroluminescence (EL) studies at liquid nitrogen temperature. The magnetic field effect on EL intensity indicates that the spin injection essentially increases the singlet-to-triplet exciton ratio in organic semiconductors. The Co size-dependent EL shows that the spin-injection efficiency decreases rapidly when the Co clusters percolate to a continuous film. The thickness-dependent EL enhancement of magnetic field suggests that the diffusion length of spin-polarized holes is about 60 nm in the MEHPPV.},
doi = {10.1103/PhysRevB.75.075413},
journal = {Physical Review B},
number = 7,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}