Degradation Mechanisms in LED Packages
Sau Koh (Material Innovation Institute (M2i), Philips Lighting Research, TU Delft - Electronic Components, Technology and Materials)
Willem van Driel (Philips Lighting Research, TU Delft - Electronic Components, Technology and Materials)
Cadmus Yuan (TNO, TU Delft - Electronic Components, Technology and Materials)
Guo Qi Zhang (Philips Lighting Research, TU Delft - Electronic Components, Technology and Materials)
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Abstract
Lumen depreciation is one of the major failure modes in light-emitting diode (LED) systems. It originated from the degradation of the different components within the package, being the LED device or chip, the driver, and the optical materials (including phosphorous layer). This chapter describes the state of the art of the degradation mechanism for these components and how they contribute to the lumen depreciation of the LED package as a whole.
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