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SDK blue LED features flip chip structure

Posted: 29 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:showa denko kk? sdk? light-emitting diode? led? gallium nitride?

Showa Denko K.K. (SDK) announced that it has developed a blue LED based on gallium nitride (GaN).

The new 12mW LED with a flip chip structure has been developed by combining the company's proprietary technologies for the production of compound semiconductors and hard disk media. Compared with existing products on the market, SDK said, the newly developed LEDs have additional advantages of low forward voltage and low electricity consumption. Target applications include mobile phones, outdoor displays, illumination and automotive devices.

GaN LED chips, which emit near ultraviolet to green light at wavelengths of 360nm to 530nm, are now used mainly in backlighting for LCDs and keypad light source for mobile phones.

According to the company, the unique flip chip structure of its new product provides better heat dissipation and higher reliability. This is a structure of LED chips in which anodes and cathodes are on the epitaxial layer, and the chips are assembled after being turned upside down.

Compared with the conventional face-up type that uses wire for bonding and emits light from the top, the new LED has a transparent substrate so that light can be brought out from all parts of the chip.

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