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Optoelectronics/Displays??

SDK rolls GaN-based LEDs

Posted: 10 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:showa denko? sdk? led? inchem Tokyo?

Showa Denko K.K. (SDK) announced its proprietary gallium-nitride-based near ultraviolet and green LED chips for use in general white lighting and backlighting of large LCD screens, respectively. These two new LED chips will be showcased at next week's Inchem Tokyo 2005, which will be held at the Tokyo Big Sight from November 15 to 18.

GaN-based LEDs

Using its already commercialized GaN-based blue LED technology as the basis, SDK developed the near ultraviolet LED with a flip chip structure, achieving a high power of 14mW in the wavelengths of around 400nm. This power level is sufficient for use in general lighting as combined with highly efficient phosphor.

The new LED also uses the ultraviolet LED epitaxial wafer technology developed as part of the high-efficiency electro-optic conversion compound semiconductor development program of the New Energy and Industrial Technology Development Organization.

Meanwhile, the GaN-based green LED was developed with a face-up structure that, according to the company, is far brighter than existing products on the market. This LED delivers 6.5mW (400mcd) in the wavelengths of 505nm (bluish green) and 6mW (500mcd) in the wavelengths of 525nm.

SDK also disclosed that they will be producing pure-green LEDs in the wavelengths of 555nm. These new products have been made possible with the use of new crystallization conditions, newly developed electrodes and the above-mentioned proprietary blue LED technology.



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