THE WHATIS.COM WORD-OF-THE-DAY
September 4, 2001
polymer LED
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KNOW-IT-ALL QUESTION
Solutions for a major remaining challenge to high-bandwidth
applications such as on-demand television, fast Internet access, and
Web pages full of multimedia effects are known as:
a. Doppler effect
b. fast packet technology
c. last-mile technology
d. load balancing
e. fiber to the curb
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TODAY'S WORD: polymer LED
See our definition with hyperlinks at
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Polymer LED (light-emitting diode) - sometimes called light-emitting
polymer or polyLED - is a technology based on the use of polymer as
the semiconductor material in LEDs. Dow Chemical Corporation
announced the discovery of light-emitting polymers at the spring
meeting of the Materials Research Society in 1998. Polymers are
chemical substances that consist of large molecules that are,
themselves, made from many smaller and simpler molecules: proteins
and DNA are examples of naturally occuring polymers; many others,
such as nylon, are artificially created. Because of their flexibility
and strength, polymers are used for products such as car bumpers and
bullet-proof vests.
Because polymers are lightweight and flexible, they can simply and
inexpensively be used for the creation of thin film displays for
future technologies such as the electronic newspaper. Polymer LEDs
have a number of inherent qualities that are ideally suited to such
applications: they enable full-spectrum color displays, high
brightness at low drive voltages, glare-free viewing, and long
operating lifetimes. It is currently possible to create a small text
display by structuring the polymer material and electrodes. The
technology also offers a great deal of promise as a basis for
cheaper, simpler lighting sources. According to Edmund Woo, of Dow's
Materials Research and Development Laboratory, polymer LEDs could be
used to create a brightness similar to that of fluorescent lighting
on a 5-volt power supply.
RELATED TERMS
light-emitting diode
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semiconductor
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electronic newspaper
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SELECTED LINKS
[1] Philips provides a backgrounder about Polymer Electronics.
http://www.research.philips.com/pressmedia/background/polymerelec/index.html
[2] EE Times explores the potential of polymer LEDs in "Polymer LEDs
shift into high gear at materials conference."
http://www.eetimes.com/news/98/1003news/polymer.html
[3] Physics Web explains polymer diodes.
http://physicsweb.org/article/world/12/6/10
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