Bright ideas on LED packaging

Intertronics claims to offer a silicone solution to the twin problems of heat dissipation and clarity when using LEDs in a protected housing for outdoor applications. The company aims to provide a product for most LED potting applications which require non-yellowing optical clarity. Options include silicone elastomers from ACC Silicones, including optically clear encapsulants, gels and rubbers with differing cure cycles and harder silicone elastomers. Products feature refractive index from 1.40 to 1.53.

Thermally conductive compounds are also available to dissipate heat away from the diode to a heat sink. ACC Q-Sil 533, for example, is said to provide heat conductivity with a low modulus and hardness, reducing stresses during thermal cycles.