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EETE JANUARY 2013

material sciences London Calling: A northern light startup By Peter Clarke Solid-State lighting is one of my tips for a technology- lifetime tests carried out at Vtt. driven trend in 2013 and no sooner has the year begun than i lighttherm’s founding team consists of Petri nyman, Ville receive the news that Vtt Ventures ltd. (espoo, Finland) and Moilanen and Kimmo Jokelainen. Ceo and co-founder nyman lumichip oy (espoo, Finland) have invested in a startup com- has experience with startups as well as in the management of pany called lighttherm ltd. (oulu, Finland). the far north has growth companies. Co-founders Moilanen and Jokelainen have the aurora borealis and, in the winter, a great need for lighting. a research background with Vtt and developed the core inno- So it should perhaps be no surprise that a Finnish cluster of vations behind the technology. expertise is developing around the topic of lighting. the investors have decided not to disclose the size of the lighttherm claims to have a patent-pending proprietary investment they are making in lighttherm at this time. But if led die interconnect technology that it reckons can produce the company wants to catch the led lighting wave it should cooler semiconductor junction temperatures. the capacity of its probably move as quickly as it can. it is forecast that a billion technology to produce improved thermal efficiency and man- led light bulbs will be produced in 2013 making an annual agement is expected to have a beneficial impact on the lifetime market worth about $20 billion. led technology still faces some of leds for lighting applications. the company aims to combine challenges, particularly where high light output is required from lower operating temperatures with new materials to produce small compact light units. Many of the components and materi- reduced materials, simpler and automated manufacturing and als used in manufacture are heat sensitive and overheating can lower-cost led light bulbs. shorten the lifespan. Vtt technical Research Center is a government backed “lighttherm materials, device construction and manufactur- applied research institute and Vtt Ventures is chartered with ing processes give flexibility in design, and will enable the man- helping to create spin-off companies to exploit the research. ufacture of entirely new lighting applications for both consumer lumichip makes led chips and packaged light engines and and industrial luminaires. We believe this will change completely has operations in Finland, hong Kong and taiwan. lighttherm’s the way in which led products are manufactured in the future,” technologies are based on development, characterization and said Juha Rantala, chairman of lumichip, in a statement. Supercapacitors enter the realm of stretchable electronics By Julien happich according to the University of delaware’s Bingqing Wei, stretchable electronics are the future of mobile electronics, leading giants such as iBM, Sony and nokia to incorporate the technology into their products. “advances in soft and stretchable substrates and elastomer- ic materials have given rise to an entirely new field,” says Wei, a mechanical engineering professor at Ud. But even if scientists can engineer stretchable electronics - what about their energy source? “Rechargeable and stretchable energy storage devices, also known as supercapacitors are urgently needed to comple- ment advances currently being made in flexible electronics,” explains Wei. Wei’s research group at the University is making significant progress in developing scalable, stretchable power sources for this type of application using carbon nanotube macrofilms, polyurethane membranes and organic electrolytes. this, he A stretchable supercapacitor made of carbon nanotube says, requires new thinking about materials processing and macrofilms, polyurethane membranes and organic device manufacturing to maximize energy storage without electrolytes. Source: University of Delaware at www.udel.edu compromising energy resources. to reveal a stretchable super- capacitator’s true performance, the Wei group examined the provide important guidelines for future design and testing of system’s electrochemical behavior using buckled single-wall this leading-edge energy storage device. As they work to refine nanotube (SWnt) electrodes and an elastomeric separator. the technology, Wei has filed a provisional patent to protect his according to Wei, the supercapacitor developed in his team’s research. the work was recently published in nano let- lab achieved excellent stability in testing and the results will ters, a journal of the american Chemical Society. 8 Electronic Engineering Times Europe January 2013 www.electronics-eetimes.com


EETE JANUARY 2013
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