Protective Materials Over LEDs and Associated Optical Effects
Wednesday, February 14, 2018: 4:00 PM - 4:30 PM
Color shift due to protective material on top of LEDs has been a concern for luminaire manufacturers when designing new products. Often, there are trade-offs between robust design and maintaining optical properties/aesthetics. Recent innovations in optical materials provide solutions with high transmission rates for LED protection and assembly. As a coating or encapsulant, Silicones can offer benefits to help reach the long expected lifetimes of LED luminaires.
While coating or encapsulating an LED can provide environmental benefits, it can also alter chromaticity specifications of LEDs. Effects depend on LED selection, material selection, thickness of material, environmental conditions (duration, lumen density, temperature, relative humidity), etc. which can make quantifying or predicting initial color shift as well as long-term color stability complicated but not impossible. This presentation covers the effects of using Silicone materials as a protective layer in direct contact with LEDs.