High-Brightness LED packages are used for protection, light-extraction,
thermal management and as molded lenses to direct light output.
Silicones have a long history of use as protective materials for
semiconductor devices. Their optical clarity and stability make them
particularly useful for use on high-brightness LEDs. Optical-grade
silicones are currently used in commercial production of LED
devices. Silicone elastomers are well known for their stress-relieving
nature and can also be useful in the production of such devices. Silicone
gels offer even greater stress relief.
When applied as encapsulants surrounding LED chips, silicones increase light
extraction by more closely matching the refractive index of the chip
surface.
Silicone resins are used commercially to form HBLED
lenses. Micrometer-sized features can be replicated on the lens
surface for benefits in directing light output for various LED
applications.
Silicones are increasingly used for thermal management. Very low thermal
resistance can be achieved by using special filters while maintaining
low-stress properties.
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If you need a
material:
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Consider
products:
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To be used in stress-sensitive applications
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With higher penetration or lower gel hardness values or with lower durometer
values for elastomeric products
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To form a lens over an LED device to direct the light output
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Molded from silicone resins such as SR-7010
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For environmental protection of LED devices from moisture and other
contaminants
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That are silicone gels or elastomers
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With a firmer surface or bulk properties
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That have higher durometer values for elastomeric products or are designated
as “resins”
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With excellent clarity for light transmission
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That are transparent
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To minimize losses of transmitted light
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That match the refractive index of the substrate
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To maximize heat dissipation
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That are thermal interface materials, either wet dispensed or cured pads and
films
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For use without the need of mixing
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That are one part
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For use on LED marker lights
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Such as GT-1020 Sealant Pads with a nontacky rubber backing on one side
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