industry news ♦ LEDs


Vertex said, “LED is an eco-friendly light source with significant growth potential in the middle- to long- term, and we intend to identify and invest into many more companies with strong technology potential going forward.”


According to the LED market reports issued by IMS Research in the U.K. and Strategies Unlimited in the U.S., Seoul Semiconductor is the world’s fourth largest LED supplier, holding more than 5,500 patents. In particular, it claims to own the world’s leading LED technology and production capacity, such as deep UV LED and non-polar LED, as well as Acriche. At present, it provides high-quality LED products through 33 overseas branches (including three local corporations) and 150 domestic agencies.


Sumitomo First To Develop 6in GaN Substrates


The substrates will be ideally suited for the production of white LEDs.


Sumitomo Electric Industries has successfully developed what it claims is the world’s first 6in diameter GaN (gallium nitride) substrates to be used for white LEDs (light emitting diodes).


Previously, the company led the world with the production of 2in GaN substrates for blue-violet lasers, which enabled production of the first Blu-ray DVD players.


Sumitomo Electric began large scale production of 2in GaN substrates designed for use in white LEDs. It has also been developing larger diameter GaN substrates.


The front face of the newly developed 6in GaN substrates is a polarized c-plane. Sumitomo Electric has ongoing development efforts to bring this material into large scale production and expects that these materials will find widespread use for both white LEDs and power devices.


Verticle claim world`s first hexagonal LED chip


Verticle, Inc of Dublin, California has announced the world’s first hexagonal LED chip. HoneycombTM LED Chip, named after its hexagonal shape, is a vertically structured LED chip developed especially for high power LED applications.


It is expected to bring a higher chip count per wafer and better optical power over conventional square or rectangular type LEDs, said Dr. Mike (M.C.) Yoo, Company CEO.


A hexagonal LED chip yields multiple benefits around cost, efficiency, and beam profile. The first advantage of HoneycombTM is a higher chip count from the wafer since hexagon is the most closely- packed structure inside of a circular wafer. A wafer can yield 15% more haxagonal chips than square or rectangular chips of equivalent size. Second, hexagonal chip aids in the current spreading, with the resulting higher light output than conventional chips. Last but not least of the hexagonal chip’s advantage is the light output enhancement after packaging. HoneycombTM chip produces a beam profile which is much closer to the circular shape of circular lens used in optic design. In contrast, the beam profile of the typical square or rectangular chip, when combined with circular lens, is normally distorted.


Although hexagonal chip’s distinctive advantages over conventional chips are widely known, it has not been realized in production up to now. The main reason is the difficulty in chip separation with conventional scribing or dicing. However, chemical chip separation technique invented by Verticle Inc. makes the chip separation step much easier and quicker than conventional chip separation techniques. Verticle’s chemical chip separation is a highly innovative chip singulation technique that can chemically etch the street line, to easily produce chips of any shape. Moreover, with this technique, Verticle can handle multiple wafers in one batch, resulting in chip separation throughputs which are 500 times greater than with conventional chip separation methods.


Verticle, Inc is an LED chip company located in the Silicon Valley, with production facilities in Korea. Verticle specializes in manufacturing vertical type LED chips for BLU and LED lighting


November/December 2010 www.compoundsemiconductor.net 67


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