High-performance Optical Silicone for High Power LED packages

Silicone materials with a relatively high refractive index have been introduced for the encapsulation of high power LEDs and LEDs with relatively short wavelengths. However, most of those existing silicone encapsulants, they still suffer thermal and radiation induced degradations and thus cause reliability issues and shorten the lifetime. A new high performance silicone has been developed and its performance has been compared with other silicone products in the packaging of high power blue and white LEDs. The new materials has been found to suffer less loss in the optical output during the aging test, high temperature/high humidity test, as well as JEDEC reliability test. Thus, this material is excellent for the packaging of high power white LEDs and high power colored LEDs, because of its ability in maintaining high transparency and great radiation/thermal resistance.