by Staff Writers
Toronto, Canada (SPX) Nov 07, 2011
Engineering researchers at the University of Toronto have developed the world's most efficient organic light-emitting diodes (OLEDs) on plastic. This result enables a flexible form factor, not to mention a less costly, alternative to traditional OLED manufacturing, which currently relies on rigid glass.
The results are reported online in the latest issue of Nature Photonics.
OLEDs provide high-contrast and low-energy displays that are rapidly becoming the dominant technology for advanced electronic screens. They are already used in some cell phone and other smaller-scale applications.
Current state-of-the-art OLEDs are produced using heavy-metal doped glass in order to achieve high efficiency and brightness, which makes them expensive to manufacture, heavy, rigid and fragile.
"For years, the biggest excitement behind OLED technologies has been the potential to effectively produce them on flexible plastic," says Materials Science and Engineering Professor Zheng-Hong Lu, the Canada Research Chair (Tier I) in Organic Optoelectronics.
Using plastic can substantially reduce the cost of production, while providing designers with a more durable and flexible material to use in their products.
The research, which was supervised by Professor Lu and led by PhD Candidates Zhibin Wang and Michael G. Helander, demonstrated the first high-efficiency OLED on plastic. The performance of their device is comparable with the best glass-based OLEDs, while providing the benefits offered by using plastic.
"This discovery, unlocks the full potential of OLEDs, leading the way to energy-efficient, flexible and impact-resistant displays," says Professor Lu.
Wang and Helander were able to re-construct the high-refractive index property previously limited to heavy metal-doped glass by using a 50-100 nanometre thick layer of tantalum(V) oxide (Ta2O5), an advanced optical thin-film coating material.
This advanced coating technique, when applied on flexible plastic, allowed the team to build the highest-efficiency OLED device ever reported with a glass-free design.
The results of Wang and Helander's work titled "Unlocking the Full Potential of Organic Light-Emitting Diodes on Flexible Plastic" are published online in the journal Nature Photonics (Nature Photonics DOI: 10.1038/nphoton.2011.259). The full paper is available here.
A video interview with Michael G. Helander discussing this research is available here.
University of Toronto Faculty of Applied Science and Engineering
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AMD cutting 10 percent of workforce
New York (AFP) Nov 3, 2011
US computer chipmaker Advanced Micro Devices is slashing 10 percent of its workforce, or about 1,400 jobs, in a cost-cutting move brought on by the weak personal computer market. The Sunnyvale, California-based AMD said Thursday that the job cuts and other moves should result in more than $200 million in operational savings in 2012. "Reducing our cost structure and focusing our global wo ... read more
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