Group creates light-emitting electrochemical cell for use in textiles

March 24, 2015 by Bob Yirka report
Fiber-shaped polymer light-emitting electrochemical cells with tunable colors are twisted together to generate colorful lights. Credit: Zhitao Zhang

A large team of researchers in China has developed a type of light emitting electrochemical cell (LEC) that can be woven into fabric material. As the team notes in their paper published in the journal Nature Photonics, their cells can be used to create wearable electronics. Henk Bolink and Enrique Ortí with the University of Valencia in Spain, offer a News & Views piece on the work done by the team in the same journal issue.

Ever since the development of OLEDs, researchers have been hot on the idea of using them to create wearable electronics, such as clothes that light up like an LED screen. But OLEDs proved too difficult to weave into fiber, which led researchers to LECs, which are essentially OLEDs with salt added to overcome some of the limitations of OLEDs. In this new effort the researchers in China have found a way to create LECs that are both strong enough and flexible enough to allow for weaving into textile fabrics.

To make the LECs, the researchers started with a tiny bare wire, which they coated with zinc oxide nanoparticles; that was followed by applying an electroluminescent polymer and than a transparent layer of carbon nanotubes—the result is a cell that is long, flexible and thin allowing for weaving into fabric. Currently, fabrics created with the cells emit just blue and yellow light (when subjected to just a few volts of electricity) but the team reports it will be a simple matter to add many more colors. The team also reports that the process for making the cells can be ramped up easily, which means the cells, and clothes with them, could be available for sale in the very near future.

There is still one down side, however, the light generated by the cells only persists for a few hours—after that they grow less and less bright. But that problem may be temporary as well, as other ongoing research with LECs suggests that much longer lasting cells may soon be made. If such do become available it could mark a rapid change in clothing, from body suits that show mood by color, to human billboards, to clothes that up in artistic ways, sort of like glowing tattoos.

Prototype of the light-emitting fibre. Credit: Huisheng Peng

Explore further: Toward Methuselah—long-living lighting devices

More information: A colour-tunable, weavable fibre-shaped polymer light-emitting electrochemical cell, Nature Photonics (2015) DOI: 10.1038/nphoton.2015.37

Abstract
The emergence of wearable electronics and optoelectronics requires the development of devices that are not only highly flexible but can also be woven into textiles to offer a truly integrated solution. Here, we report a colour-tunable, weavable fibre-shaped polymer light-emitting electrochemical cell (PLEC). The fibre-shaped PLEC is fabricated using all-solution-based processes that can be scaled up for practical applications. The design has a coaxial structure comprising a modified metal wire cathode and a conducting aligned carbon nanotube sheet anode, with an electroluminescent polymer layer sandwiched between them. The fibre shape offers unique and promising advantages. For example, the luminance is independent of viewing angle, the fibre-shaped PLEC can provide a variety of different and tunable colours, it is lightweight, flexible and wearable, and it can potentially be woven into light-emitting clothes for the creation of smart fabrics.

Related Stories

Future light component produced in printing press

August 15, 2012

(Phys.org) -- In the August issue of Nature Communications, Professor Ludvig Edman and PhD Andreas Sandström at Umeå University, report that they have produced organic light-emitting electrochemical cells (LECs) ...

Flexible silicon solar-cell fabrics may soon become possible

December 6, 2012

For the first time, a silicon-based optical fiber with solar-cell capabilities has been developed that has been shown to be scalable to many meters in length. The research opens the door to the possibility of weaving together ...

Recommended for you

Carefully crafted light pulses control neuron activity

November 17, 2017

Specially tailored, ultrafast pulses of light can trigger neurons to fire and could one day help patients with light-sensitive circadian or mood problems, according to a new study in mice at the University of Illinois.

Strain-free epitaxy of germanium film on mica

November 17, 2017

Germanium, an elemental semiconductor, was the material of choice in the early history of electronic devices, before it was largely replaced by silicon. But due to its high charge carrier mobility—higher than silicon by ...

New imaging technique peers inside living cells

November 16, 2017

To undergo high-resolution imaging, cells often must be sliced and diced, dehydrated, painted with toxic stains, or embedded in resin. For cells, the result is certain death.

The stacked color sensor

November 16, 2017

Red-sensitive, blue-sensitive and green-sensitive color sensors stacked on top of each other instead of being lined up in a mosaic pattern – this principle could allow image sensors with unprecedented resolution and sensitivity ...

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

Thnder
not rated yet Mar 31, 2015
Tron like Clones in the future?

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.