LEDs ♦ news digest
has an operating life of up to 50,000 hours, while a conventional incandescent bulb has a lifespan of just approximately 1000 hours. Another advantage of LEDs is that they contain neither lead nor mercury.
“In Landshut, we have discovered the ideal infrastructure for our future high-volume production of efficient LED chips. Our LED lamps and luminaires are on the way towards lighting up indoor, outdoor and residential areas all over the world”, explains Hans Peter Ehweiner, the Managing Director of Optogan GmbH.
The foundation of the new site is the former Hitachi semiconductor factory, which offers a clean room area of up to 4,000m². Investments reaching double figures of millions of euros and up to 100 members of staff form the framework for the company’s production activities. An initial capacity of over one billion LED chips per year combined with innovative and cost-effective manufacturing processes means that Optogan is well equipped for a bright future.
The Landshut site also forms the basis of the international sales activities carried out by the Optogan Group. The company’s core business currently involves the European markets, but it is also becoming increasingly popular on a worldwide level.
The Optogan Group was founded by three Russian physicists in Finland in 2004. Since 2005, the company has been developing and manufacturing state-of-the-art chip technologies in the German city of Dortmund. At the end of 2010, Optogan opened the largest production site for LED components and moderns in the whole of Eastern Europe in St. Petersburg. The Landshut site is now home to the production of light-emitting diode chips, which are able to light up lamps for 30 years and carry the seal of “Made in Germany”.
Epistar impressed with Candela inspection system for LEDs
The advanced technology will help determine root cause analysis of defects in gallium nitride grown on sapphire substrates.
KLA-Tencor has announced that Epistar, a leading Taiwanese manufacturer of LED chips, has adopted its Candela substrate and epwafer inspection system.
KLA says this order marks the growing adoption by LED device manufacturers worldwide of this advanced inspection system for wafer defect detection and classification at production-grade throughputs.
The introduction of the Candela tool to Epistar›s manufacturing process provides automated inspection methods for sapphire substrates to ensure vendor quality, and provides greater visibility into the GaN epi process to help detect the root causes of defects and early prediction of process excursions.
According to an Epistar spokesperson, «Adoption of KLA-Tencor›s Candela inspection has provided Epistar with improved sapphire quality control and MOCVD process control.»
Substrate defects are known to impact epi process yield, and the Candela system provides increased sensitivity to these yield-limiting defects. With its proprietary optical design and detection technology, the Candela system detects and classifies sub- micron defects - including micro-cracks and -scratches, polishing and brushing streaks, and chemical residues.
Europe´s second largest chip production in the Bavarian district of Landshut
As LED manufacturers transition production to larger wafer sizes and introduce new patterned sapphire substrate (PSS) processes, the economic impact of resulting process-induced defects is significant. For defects occurring during the epi process steps, the Candela tool can detect hexagonal pits and bumps which can lead to electrical failure and epi cracks that can adversely impact field reliability.
November/December 2011
www.compoundsemiconductor.net 97
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