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Optoelectronics/Displays??

New LED chips from SDK

Posted: 29 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Showa Denko K.K.? sdk? gallium-nitride? ultraviolet? green?

Showa Denko K.K. (SDK) launched gallium-nitride-based near ultraviolet and green LED chips for use in general white lighting and backlighting of large LCD screens, respectively.

The GaN-based near ultraviolet LED will be combined with phosphor to provide white lighting. So far, SDK said, blue LEDs and yellow phosphor are combined for white backlighting of LCD screens in mobile phones. However, the existing white lighting is not sufficient for general lighting applications due to low levels of its red/green components and color rendering property.

When the newly developed near ultraviolet LED is combined with the mixture of phosphor of the three primary colors (red, green and blue), it achieves high levels of color rendering property, enabling its use in general lighting.

Using its already commercialized GaN-based blue LED technology as the basis, SDK has developed the near ultraviolet LED with a flip chip structure, achieving a high power of 14mW in the wavelengths of around 400nm. The power level is sufficient for use in general lighting as combined with highly efficient phosphor. This new LED also uses the ultraviolet LED epitaxial wafer technology developed as part of the high-efficiency electro-optic conversion compound semiconductor development program (the Light for the 21st Century project) of the New Energy and Industrial Technology Development Organization (NEDO).

Meanwhile, the newly developed GaN-based green LED ensures higher brightness and reliability. The company developed the green LEDs with a face-up structure, which is said to be far brighter than existing products on the market: 6.5mW (400mcd) in the wavelengths of 505nm (bluish green) and 6mW (500mcd) in the wavelengths of 525nm. SDK disclosed that they will also produce pure-green LEDs in the 555nm wavelengths.




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