FW: Long polymers light up LEDs and other random news
- View SourceSince nobody else seems to have anything to say, I'll
try posting some news articles I thought were interesting.
Long polymers light up LEDs (Apr 30)
LEDs made from long-chain polymers should emit more light
than those based on short molecules, according to
physicists in the US and the Netherlands. Valy Vardeny of
the University of Utah and colleagues say they were amazed
to find that the production of light-emitting `excitons' in
these materials depends on the length of the polymer chain.
The discovery could lead to the development of
ultra-efficient polymer LEDs (M Wohlgenannt et al 2002
Phys. Rev. Lett. 88 197401).
Light flash restructures carbon nanotubes
In an accidental discovery at Rensselaer Polytechnic
Institute, materials researchers have found that
carbon nanotubes can be restructured using light.
The effect was discovered when a laboratory assistant,
undergraduate Andres de la Guardia, was photographing
a batch of synthesized single-walled carbon nanotubes.
His photo showed the nanotubes igniting.
Polymer transistors hint at all-organic displays
Researchers at Pennsylvania State University have built
an active-matrix (AM) LCD that uses polymer transistors
in place of silicon devices. The Penn State team claims
the performance of the display is comparable to those
built using amorphous silicon devices.
Bell Labs breaks through on Moore's Law
Scientists at Bell Labs, the research and development arm
of Lucent Technologies, have found a way to peer deep
inside a semiconductor and create an image of a single
impurity atom in silicon, a development that will
help scientists understand how impurities affect the
properties of microchips.
Origin of bipedalism seems most closely tied to environmental
The hypothesis they found the most support for regarding
the origin of bipedalism is the one that argues our
ancestors began walking upright largely in response
to environmental changes -- in particular, to the
growing incidence of open spaces and the way that
changed the distribution of food.
USC Ophthalmologists Announce Launch of Permanent Retinal
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