news digest ♦ LEDs airflow profile.
“Ready access to the TEMPO Thermal Simulation service has saved our team weeks in the product engineering process,” said Jim Shapiro, FEIT ELECTRIC, director of product development. “And speed and quality are the name of the game in the LED marketplace.”
Cree has also added an additional, quick turn-around photometric evaluation option to its TEMPO SPOT service to help prevent costly design mistakes at any step of the development process. TEMPO SPOT services are designed to give a rapid photometric view on a prototype’s performance. This new service gives customers access to complex, costly equipment to measure the photometric performance of luminaires and replacement lamps. Customers can choose integrated measurements from a 2-meter sphere or 3-D measurements from a Type C Goniophotometer to visualize and predict the photometric performance of an installed luminaire.
“With the fast turnaround of Cree’s new TEMPO SPOT service we were able to quickly validate our design assumptions,” said Colin Piepgras, Digital Lumens, vice president of engineering. “Cree clearly understands the challenges of the LED fixture design cycle and its new service offerings hit the nail on the head, giving us precisely what we needed, in the time we needed it in.”
Cree currently provides TEMPO Services out of its Cree Technology Centres, located in Research Triangle Park, N.C. and Santa Barbara, California. Future TEMPO Service locations in Shenzhen, Munich, Shanghai and Taiwan are targeted to open in 2012.
Commercialisation of large sapphire substrates
SMM aims to mass-produce 6-inch diameter sapphire substrates which are hoped to take
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www.compoundsemiconductor.net January / February 2012
over from 2-inch to 4-inch diameter wafers currently the most prevalent in the LED market
The president of Sumitomo Metal Mining (SMM), Nobumasa Kemori has announced a decision to establish a mass production line within its fully-owned subsidiary Okuchi Electronics based in Isa City, Kagoshima Prefecture, Japan.
Sapphire substrates are used in the fabrication of GaN for use in white and blue LEDs. Demand for white LEDs is growing for use in applications such as backlighting in large- screen LCD televisions and is also expanding rapidly in the general lighting market due to the use of LEDs saving energy and reducing environmental impacts. Accordingly, the sapphire substrate market is expected to see further growth.
Having planned entry into large sapphire substrates for some time, SMM has made the decision to install a new large fabrication furnace within Okuchi Electronics and mass- produce 6-inch-diameter sapphire substrates.
The planned value of the capital investment is about ¥1.2 billion (US $120 million) including investment already completed. Through the investment, SMM will construct a continuous production system extending from fabrication of large sapphire crystals to substrate processing.
At present, 2- to 4-inch-diameter sapphire substrates are prevalent in the market. However, due to demands for cost reductions from LED manufacturers, demand for larger- diameter substrates is forecast to expand. Production of 6-inch-diameter substrates requires the fabrication of large-size crystals, but according to SMM, production is technologically difficult and can be performed stably by only a small number of manufacturers worldwide.
Sumitomo Metal Mining has secured mass production capability based on its crystal
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