Last year, Philips indeed partnered with Denmark-based Kvadrat Soft Cells to develop wallpapers containing integrated LEDs. Philips’ LED lighting integrated in the Kvadrat Soft Cells panels aimed at providing full flexibility in achieving a desired ambiance.
However, to my knowledge, printing white LEDs directly on paper using chemical methods is innovative.
PhD student at Linköping University in Sweden, Gul Amin has demonstrated in his doctoral thesisthat white LEDs, made from zinc oxide and a conducting polymer, can be manufactured directly on paper. It is possible to print them on wallpaper, for instance.
The active components are nanorods of zinc oxide on a thin layer of polydiethylflourene (PFO), a conducting polymer. The paper has first been coated with a thin, water-repellent, protective and leveling layer of cyclotene, a resin.
The first part of the thesis deals with ZnO nanostructures grown under different hydrothermal conditions in order to gain a better understanding of the growth. In the second part of the thesis, using the results and findings from the growth of ZnO nanostructures, Amin claimed it was possible to implement ZnO nanostructures for white LEDs on different flexible substrates.
Amin said he and his team realized a ZnO/polymer LED grown on a paper substrate and then extended the idea to print the ZnO nanorods/polymer hybrid LEDs with potential application to large area flexible displays.
“This is the first time anyone has been able to build electronic and photonic inorganic semiconducting components directly on paper using chemical methods,” commented professor Magnus Willander, who is leading the research.
This method has a patent pending.
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To access the 66-page thesis, titled "ZnO and CuO Nanostructures: Low Temperature Growth, Characterization, their Optoelectronic and Sensing Applications", click http://liu.diva-portal.org/smash/get/diva2:515790/FULLTEXT01 here.
And, to check out all the publications that Gul Amin authored, or co-authored, click here: http://www.researcherid.com/ProfileView.action?returnCode=ROUTER.Unauthorized&queryString=KG0UuZjN5WlAYxhcsfVbhZwfAFE7HrmBtge22mYy9Q8%253D&SrcApp=CR&Init=Yes
Also of interest: In one of the thesis articles, published in Springer’s Journal of Material Science, Gul Amin demonstrates 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.
thank you Anne-Francoise, cool technology...I wonder how long before possible real application, 5 years? 10 years?...Gul: would you be interested in presenting your research at emerging technology symposium in Whistler in 2013? details at www.cmoset.com, Kris
There had been many like this. For example year 2005 printed integrated electronics circuits was exhibited at the Plastics Electronics trade fair in Frankfurt. So many researches are made on this line but finally when it comes to cost of production they do not compete.
I think to print LEDs or other devices directly on paper using chemical methods will have some positive impacts on technology. Because the method is inexpensive, easy, environment friendly and the devices can be fabricated on large area.
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