Curing material controls LED color
LUMISIL 868S is a transparent specialty silicone for encapsulating light emitting diodes (LED). This two-component, addition-curing product, which has a pot-life of 24 hours after the components have been mixed, prevents luminescent dyes from settling in the liquid encapsulant. The material adheres to conventional reflector substrates, without their having to be pretreated. The encapsulant can be applied by either dispensing or jet methods.
LUMISIL 868 S is designed for mass production of LEDs in which the purpose of the encapsulant is not only to protect the sensitive chip, but also to selectively influence the color of the emitted light. The LED maker simply mixes the luminescent dyes into the liquid silicone to produce emitted light with the desired spectral distribution – this is the process used to make LEDs that generate white light. With LUMISIL 868 S, manufacturers can be assured that the quality of the LED light remains constant.
A further product highlight is LUMISIL 885. This is a new, addition-curing silicone rubber of medium viscosity that cures to yield a very transparent, high-Shore elastomer that confers high luminous efficacy in optical applications. The two-component product is ideal for transfer molding, but can also be compression molded. This versatility makes production of LED lenses and other optical components more cost effective.
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
