nanotehnoloogia, nanoteknologia, nanotechnologija, nanotehnologijas, nanoteknologija,
nanotechnologii, nanotecnologia, nanotehnologijo, nanoteknik
Performance OLED on Carbon Nanotube Electrodes
Researchers at the Regroupement Québecois sur les Matériaux de
Pointe (RQMP) in Québec, Canada have assembled an organic light emitting
diode (OLED) that uses thin and conductive single wall carbon nanotube sheets
as the transparent electrode. The performance of their electrode rivals that
of the transparent conducting oxide - indium tin oxide - currently used in commercial
applications. The demonstration of this new technology recently appeared in
the May online issue of Applied Physics Letters .
Schematic of the OLED device fabricated on a carbon
nanotube electrode (above) and image of the device
revealing the carbon nanotube fibers that compose
the fabric-like sheet electrode (below).
Copyright © Université de Montréal
light emitting diodes have in recent years emerged
as a promising low cost technology for making large
area flat panel displays and flexible light emitting
fabrics. However, the fabrication of flexible OLEDs
has up to now been held back by the fragility of
the brittle indium tin oxide layer that serves as
the transparent electrode. Constant bending of this
layer unavoidably leads to cracking and device failure.
By using carbon nanotubes, a highly conductive and
flexible tube shaped carbon nanostructure, thin sheets
a few tens of nanometers in thickness can be fabricated
following a procedure akin to making paper. These
sheets preserve the conductivity and flexibility
of the carbon nanotubes and are thin enough to be
By following the fabrication procedure they developed, the researchers succeeded
in producing a high-performance OLED on this new electrode material. In their
work they also outline the parameters that can be further optimized in order
improve the performance of their design. "In addition to their flexibility,
carbon nanotube sheets exhibit a number of properties that make them an attractive
alternative to transparent conducting oxides for display and lighting applications," says
Carla Aguirre, the leading author of the paper. "By applying the appropriate
chemical treatment they can in principle be also made to replace the metal
electrode in order to make OLEDs that emit light from both sides."
To learn more, refer to the scientific article: "Carbon nanotube sheets as
electrodes in organic light-emitting diodes" Appl. Phys. Lett. 88 183104 (2006)
or visit this
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