Hole blocking in carbon nanotube-polymer composite organic light-emitting diodes based on poly (m-phenylene vinylene-co-2, 5-dioctoxy-p-phenylene vinylene)
Citation:
Woo, H.S., Czerw, R., Webster, S., Carroll, D.L., Ballato, J., Strevens, A.E., O'Brien, D., Blau, W.J., Hole blocking in carbon nanotube-polymer composite organic light-emitting diodes based on poly (m-phenylene vinylene-co-2, 5-dioctoxy-p-phenylene vinylene), Applied Physics Letters, 77, 9, 2000, 1393-1395Download Item:
Abstract:
In order to investigate the role of carbon nanotubes in a polymer matrix, organic light-emitting
diodes were fabricated from a polymer composite composed of poly
~
m
-phenylene
vinylene-co-2,5-dioctoxy-
p
-phenylene
!~
PmPV
!
and dispersed single-wall carbon nanotubes
~
SWNTs
!
. Tris-
~
8-hydroxyquinolinolato
!
aluminum (Alq
3
) doped by Nile Red was used as an
emissive material between the polymer composite and cathode. The device fabricated without
SWNTs dispersed in the PmPV shows a dominant emission near red at 600 nm, which is in the
range of the characteristic emission of Nile Red-doped Alq
3
, with a small amount of green emission
from the PmPV. However, the devices fabricated with the polymer composite show an increase in
the oscillator strength of the green emission with a dominant emission peak near 500 nm, the
characteristic emission of PmPV. This was observed for SWNT concentrations up to 0.1 wt %. The
shift in the emission indicates that the SWNTs in the PmPV matrix act as a hole-blocking material
that results in a shifting of the recombination region from the Nile Red-doped Alq
3
layer to the
PmPV composite layer.
Author's Homepage:
http://people.tcd.ie/wblauDescription:
PUBLISHED
Author: BLAU, WERNER
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Series/Report no:
Applied Physics Letters;77;
9;
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