Effect of heat and short-wavelength visible radiation on phosphor-embedded LED encapsulant

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Authors
Appaiah, Prathika
Issue Date
2013-12
Type
Electronic thesis
Thesis
Language
ENG
Keywords
Lighting
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Abstract
The encapsulant plays a vital role in determining the lifetime of an LED. Commonly used encapsulants are epoxy and silicone. During the operation of a pc-white LED the encapsulant is subjected to short wavelength radiation and heat from the LED chip that can degrade the encapsulant material. The degrading encapsulant reduces light output and results in reduced service life. This thesis study evaluates the effect of short-wavelength radiation and heat on the encapsulant material by examining the light transmission through an epoxy medium with phosphor as a function of short-wavelength irradiance, heat, and phosphor concentration.
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December 2013
School of Architecture
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Rensselaer Polytechnic Institute, Troy, NY
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