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Optoelectronics/Displays??

Kopin creates miniature blue LEDs using semiconductor process

Posted: 02 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:blue LED? semiconductor? nanotechnology? CyberLite?

In a study published in the July 29 edition of the Applied Physics Letters, Kopin Corp. revealed a breakthrough in semiconductor process by harnessing nanotechnology to produce blue LEDs that are smaller than a grain of sand but are ultra efficient solid state light sources.

Using a new patent-pending process that creates "NanoPockets" and other improvements, Kopin has developed a way to produce blue LED chips as bright as those commercially available and yet can be driven by much lower voltage. Kopin's new CyberLite blue LED chips require less than 2.9V of electricity (for 20mA current)significantly lower than 3.3V for commercially available LEDsand yet have 100mcd brightness.

"Getting below 3V has been a scientific hurdle for nearly a decade," said Kopin Founder and Chairman Dr. John C.C. Fan. "It took a new way of thinking to overcome this challenge. With further development, we can approach the holy grail of using these solid-state sources for general lighting."

The blue CyberLite can be combined with a yellow phosphor to create a white LED. These blue and white CyberLites are ideal for compact portable light-using devices, such as wireless phones, games, camcorders, cameras, laptops and PDAs, which operate on battery power.

"With CyberLites, we have taken a very important first step in the commercialization of nanotechnology," said Fan. He says the company has already begun shipping evaluation samples of CyberLites to prospective buyers.

According to Kopin, it selected LED lighting as its next innovation based on its Wafer Engineering Process because it has synergies with its current III-V and CyberDisplays products, and because the high-brightness LED market is already large at $1.2 billion today and expected to grow rapidly reaching more than $3 billion by 2005, according to Strategies Unlimited.

Kopin's CyberLites are fabricated on GaN compounds grown on low-cost aluminum oxide (sapphire) substrates by the same process, organometallic chemical vapor deposition that the company uses for volume production of its HBT transistor wafers. In addition to high brightness and low voltage, CyberLites have achieved ESD resistance of over 4kV while resistance of commercially available LEDs is 2kV or lower. High ESD resistance is critical for industrial applications such as in automobiles.





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