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High-Refractive-Index Encapsulants for High-Brightness LEDs

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Encapsulants play a key role in LED optical performance and packaging.

Garo Khanarian, David Conner, David Mosley, David Thorsen and Ethan Simon, Rohm and Haas Electronic Materials.

High-brightness LEDs have developed rapidly during the past five years. They are used in traffic lights, signs and specialty lighting and in new applications such as backlight units for LCDs, headlamps for cars and street lighting. The efficiencies of white light from high-brightness LEDs now have reached greater than 100 lm/W, while costs keep decreasing. The efficiency per cost of high-brightness LEDs has been doubling every two years, which will lead to even wider use in general lighting in the future. A high-brightness LED is a solid-state light-emitting chip that emits in blue,...Read full article

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