White LEDs directly on paper

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 Linkoping University, Sweden.

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

The active components are nanorods of on a thin layer of polydiethylflourene (PFO), a . 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.

Explore further: A safe approach to nanotechnology: Boiling up zinc oxide nanorods without toxic solvents

More information: The thesis: ZnO and CuO Nanostructures: Low Temperature Growth, Characterization, their Optoelectronic and Sensing Applications, Gul Amin, Department of Science and Technology, Linköping University, Campus Norrköping, 2012. liu.diva-portal.org/smash/reco … d=1&pid=diva2:515790

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not rated yet Jul 10, 2012
Alright, how about teaming it up with the ability to alter paper (http://phys.org/n...c.html), and print color LED's too. Then you could make the walls essentially giant displays. Forget lamps, posters, wallhangings.
Oo! Pair up wall-size computer displays with the Leap Motion device coming out in December, and have fully interactive rooms.
not rated yet Jul 10, 2012
Oo! As you hang your virtual pictures of friends and family, they could be linked up to live webcams (if the subject consented). That picture of mom that's moving in a Potter-esque way? Actually an interactive link with mom. Privacy mode would be easier to activate than hanging a curtain over the picture, though.
5 / 5 (2) Jul 10, 2012
And all of it using less power than a toaster oven!

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