White LEDs lighting directly on paper

ScienceDaily (July 10, 2012) ? Imagine a white luminous curtain waving in the breeze. Or wallpaper that lights up your room with perfect white light. The applications are not very far away.White LEDs, made from zinc oxide and a conducting polymer, can be manufactured directly on paper, as shown by Gul Amin in his doctoral thesis at Link?ping University.

Imagine a white luminous curtain waving in the breeze. Or wallpaper that lights up your room with perfect white light. These might sound like flights of fancy, but the applications are not very far away.

In his thesis, Gul Amin, who recently received his doctorate at the Physical Electronics and Nanotechnology group, Campus Norrk?ping, shows how it is possible to grow white LEDs directly on paper and also to print them on wallpaper for example -- this method has a patent pending.

The active components are nanorods of zinc oxide on a thin layer of polydiethylflourene (PFO), a conducting polymer. But the paper has first been coated with a thin, water-repellent, protective and levelling layer of cyclotene, a resin.

"This is the first time anyone has been able to build electronic and photonic inorganic semiconducting components directly on paper using chemical methods," says professor Magnus Willander, who is leading the research.

The article has been published in Wiley's Phys. Status Solidi -- Rapid Research Letters.

In one of the thesis' other articles, published in Springer's Journal of Material Science, Gul Amin also shows how it is possible to grow nanorods on paper, blow them off the surface using ultrasound and collect them in the form of a powder. This powder can then be used to print the nanorods of zinc oxide, and thus LEDs, on paper or plastic in a normal printing press. That method also has patents pending.

Further information: http://liu.diva-portal.org/smash/record.jsf;jsessionid=7a910f9338f2970778e8e1e1a780?searchId=1&pid=diva2:515790

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Story Source:

The above story is reprinted from materials provided by Link?ping Universitet.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.

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Journal References:

1. G. Amin, S. Zaman, A. Zainelabdin, O. Nur, M. Willander. ZnO nanorods-polymer hybrid white light emitting diode grown on a disposable paper substrate. physica status solidi (RRL) - Rapid Research Letters, 2011; 5 (2): 71 DOI: 10.1002/pssr.201004446
2. G. Amin, S. Zaman, A. Zainelabdin, O. Nur, M. Willander. ZnO nanorods-polymer hybrid white light emitting diode grown on a disposable paper substrate. physica status solidi (RRL) - Rapid Research Letters, 2011; 5 (2): 71 DOI: 10.1002/pssr.201004446

Note: If no author is given, the source is cited instead.

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Source: http://www.sciencedaily.com/releases/2012/07/120710093409.htm

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