MOSCOW (MRC) -- Wacker, the Munich-based chemical company, has developed new encapsulants for light emitting diodes (LED) and optical components, said the producer on its site.
The compounds are made of highly transparent silicone elastomers with a high refractive index. The products withstand high operating temperatures and strong light radiation without yellowing. That makes them ideal for manufacturing LEDs with high light efficiency. They also protect the LED chip against corrosive gases, which greatly extends the component’s service life. The silicone encapsulation compounds can be processed in industrial metering processes such as dispensing.
LUMISIL 590 and LUMISIL 591 are highly transparent, addition-curing silicone elastomers with a refractive index of 1.53, which means they rank among the high-refractive-index (HRI) encapsulants. Such grades are particularly suitable for manufacturing highly efficient LEDs. The HRI silicone protects the sensitive LED chip against mechanical influences and corrosive gases. At the same time, the silicone’s high refractive index enables optimum light efficiency.
LUMISIL 590 and LUMISIL 591 protect the LED chip reliably against environmental influences. Corrosive gases such as hydrogen sulfide can damage the LED chip and reduce its performance. Tests show that LED chips encapsulated with LUMISIL 590 and LUMISIL 591 are protected against such damage longer and have a prolonged service life.
The LUMISIL product line comprises optical high-performance silicones for LED manufacturers with high requirements. All LUMISIL products enable very efficient, cost-effective production and exhibit optimized flow and crosslinking characteristics, as well as high photostability. As an encapsulation material, they protect the LED chip reliably against environmental influences and thereby extend its service life.
Wacker offers highly transparent silicone elastomers for applications with a high (HRI) and normal (NRI) refractive index. HRI silicones combine high light efficiency with low gas permeability, which make them ideal for high-end LEDs. For NRI applications, WACKER offers a wide range of products with easy workability in conventional processes such as encapsulation, mold-making and injection molding.
As MRC informed previously, in 2013, Wacker Chemie AG officially launched its new production plant for ethylene-vinyl-acetate copolymer (EVA) dispersions at its Ulsan site in South Korea. The additional 40,000 tonnes from the second reactor line increases the site's EVA-dispersion capacity to a total of 90,000 tonnes per year. The production capacity of the site has, thus, almost doubled, making the plant complex one of the biggest of its kind in South Korea.
Wacker Chemie AG is a worldwide operating company in the chemical business, founded 1914. The company is controlled by the Wacker-family holding more than 50 percent of the shares. The corporation is operating more than 25 production sites in Europe, Asia, and the Americas. The product range includes silicone rubbers, polymer products like ethylene vinyl acetate redispersible polymer powder, chemical materials, polysilicon and wafers for semiconductor industry.
MRC