As the picture shows the principles of the crystal growth:

With raw materials placed in the the iridium crucible,raw materials is heated to melt with radio frequency induction heating coil. Then place an Iridium-mold within the intermediate of the crucible. Let the-Acting Soup stalls sq. within the surface of the the iridium-Built mold then forming a thin film. Put down crystalspecies so to touch the film and the film crystallized into a single crystal from the surface of the seed crystal with the same structure of the seed crystal. The seed crystal then slowly pull up and gradually grow into single crystal.

At the same time, Crucible provids melt soup for film. Since the edge of the film is defined by the iridium mold and continue feeding for the growth of crystal, so it was called Defined Edge-defined Film-fed Growth, short for EFG.

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Pittsfield, MA, May 04, 2013 –(PR.com)– On display at the company’s booth, LED applications and live demonstrations are spotlighting how high-performance silicones contribute to improved efficiencies, greater design freedom and enhanced productivity.

“Advanced LED light sources are fueling rapid global demand for innovative new materials that perform under very harsh conditions, especially high temperatures and power densities,” said Eric Peeters, vice president, Dow Corning Electronic Solutions. “As a dedicated collaboration and innovation partner, Dow Corning is joining with our customers to meet this demand with LED silicone technologies. In this way, we can play an active role in helping them to drive the cost-effective and reliable development of true next-generation LED devices.”

Offering excellent optical-quality and a variety of refractive index values, Dow Corning silicones allow designers to more effectively shape light and improve efficiency. Plus, the outstanding thermal stability intrinsic to these materials enables them to retain their excellent transparency and color quality even after prolonged exposure to temperatures exceeding 150ºC. Thus, compared to organic polymers like polycarbonate and acrylic, silicones provide a more effective hedge against heat-induced yellowing of optical elements in high-intensity lamp and luminaire designs.

Greater design flexibility is another major benefit that silicones provide. Today’s LED lamps and luminaires may already incorporate over ten different silicone-based solutions, including adhesives, pottants, encapsulants, thermal management materials and optics. Yet, the high clarity and excellent moldability of Dow Corning’s optical-grade materials enables LED manufacturers to achieve even broader design options, including more complex shapes, micro-scale optical structures and even undercuts that are difficult to achieve with plastics or glass. These qualities also expand design latitude for other optical elements, including secondary lenses, reflectors, light pipes, light guides and other high-performing optical components.

The Dow Corning booth is featuring three demonstration stations that illustrate these critical benefits using the company’s broad portfolio of advanced LED silicones. They include a station highlighting how the materials enhance LED optical efficiency; a second demonstration station showcasing the tremendous design flexibility of silicone products; and a third featuring an injection molding machine producing optical silicone components to underscore the exceptional processability of these materials.

As the market leader in encapsulants for LED packaging, Dow Corning innovates high-performance silicon-based materials for the next generation of lighting designs. Dow Corning Lighting Solutions spans the entire value chain, adding reliability and efficiency for sealing, protecting, adhering, cooling, and shaping light across all lighting applications. (By Watch List News)


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Silicon Labs is offering a CMOS-based drop-in replacement for optocoupler-isolated gate drivers.

Supporting up to 5kV isolation ratings and up to 10kV surge protection, the Si826x isolated gate drivers emulate the behaviour of opto-drivers by modulating a high-frequency carrier instead of light from an LED.

According to the supplier, the simpler digital architecture provides a robust isolated data path that requires no special considerations or initialisation at start-up.

Growing tomatoes exposed to extra light from LED lamps may produce more vitamin C, according to Dutch researchers from Wageningen UR Greenhouse Horticulture.

In collaboration with Philips, the scientists tested various tomato varieties and various levels of light intensity.

The fruit were exposed to extra “sunlight” via hanging lights that lluminated clusters typically hidden in the shade of the plant’s leaves.

The variety with the biggest reaction showed twice as much vitamin C content for fruit exposed to the lights as for those that were not.

The light exposure in this particular case was described as a quarter of the natural light intensity on a sunny day.

The research program will continue on in a new joint facility in Bleiswijk dedicated to investigating LED lamps in horticulture. Research has begun on other fruit and vegetables as well to determine the light’s impact on nutritional value and flavor. (By FreshFruitPortal)


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