Flip-chip LEDs boost brightness

A novel aluminium indium gallium phosphide (AlInGaP) light-emitting diode is claimed to be three times as bright as existing devices.

A novel aluminium indium gallium phosphide (AlInGaP) light-emitting diode is claimed to be three times as bright as existing devices.

The new product, developed at SDK's Chichibu Plant, features a flip-chip structure and is expected to fulfil a growing demand for use in outdoor displays, illumination, mobile phones, traffic light and automotive devices.

SDK's proprietary flip-chip technology has enabled production of LEDs with transparent substrates and a special electrode structure.

This technology has obviated the use of wire bonding in the assembly process, resulting in smaller and thinner packaging.

The newly developed LEDs emit red and orange light with exceptional levels of brightness compared with existing products on the market.

SDK is planning to start commercial production of the product, while further increasing the brightness and diversifying the product lines.

SDK expects to sell Yen 3 billion of AlInGaP LEDs with exceptional brightness in 2005.

AlInGaP LEDs have increasingly been used in recent years as they emit bright light in the wavelengths from red to yellow-green.

Efforts are being made to further increase their brightness.

They are also used in combination with indium gallium nitride (InGaN) LEDs that emit light in the wavelengths from blue to green.

Applications of AlInGaP LEDs, now centring on outdoor displays and car interior trim, are expected to broaden to include illumination, traffic lights and car exterior trim.

In particular, the combination of AlInGaP LED with an InGaN LED with exceptional brightness will find wide applications in the area of illumination.

Demand for AlInGaP LEDs is expected to continue to grow at a yearly rate of around 20%.

SDK has been supplying differentiated AlInGaP LEDs with the aim of participating in the growing market for high-brightness LEDs.

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