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Title: Spin injection from ferromagnetic Co nanoclusters into organic semiconducting polymers

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];  [2];  [2];  [2]
  1. University of Tennessee, Knoxville (UTK)
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
963669
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; ELECTROLUMINESCENCE; EXCITONS; MAGNETIC FIELDS; NITROGEN; ORGANIC SEMICONDUCTORS; POLYMERS; SPIN

Citation Formats

Wu, Yue, Hu, Bin, Howe, Jane Y, Li, An-Ping, and Shen, Jian. Spin injection from ferromagnetic Co nanoclusters into organic semiconducting polymers. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.75.075413.
Wu, Yue, Hu, Bin, Howe, Jane Y, Li, An-Ping, & Shen, Jian. Spin injection from ferromagnetic Co nanoclusters into organic semiconducting polymers. United States. doi:10.1103/PhysRevB.75.075413.
Wu, Yue, Hu, Bin, Howe, Jane Y, Li, An-Ping, and Shen, Jian. Mon . "Spin injection from ferromagnetic Co nanoclusters into organic semiconducting polymers". United States. doi:10.1103/PhysRevB.75.075413.
@article{osti_963669,
title = {Spin injection from ferromagnetic Co nanoclusters into organic semiconducting polymers},
author = {Wu, Yue and Hu, Bin and Howe, Jane Y and Li, An-Ping and Shen, Jian},
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}
}