Progress in Understanding Color Maintenance in Solid-State Lighting Systems

Maryam Yazdan Mehr, Willem Dirk van Driel, G. Q. (Kouchi) Zhang

Engineering ›› 2015, Vol. 1 ›› Issue (2) : 170-178.

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Engineering ›› 2015, Vol. 1 ›› Issue (2) : 170-178. DOI: 10.15302/J-ENG-2015035
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Progress in Understanding Color Maintenance in Solid-State Lighting Systems

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Abstract

In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting (SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different real-life industrial conditions. Different degradation mechanisms in different parts of the system are also explained. Different materials used as lenses/encapsulants in light-emitting diode (LED)-based products are introduced and their contributions to color shift are discussed. Efforts put into standardization, characterizing, and predicting lumen maintenance are also briefly reviewed in this paper.

Keywords

light-emitting diode (LED) / color shift / lumen depreciation / lumen degradation

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Maryam Yazdan Mehr, Willem Dirk van Driel, G. Q. (Kouchi) Zhang. Progress in Understanding Color Maintenance in Solid-State Lighting Systems. Engineering, 2015, 1(2): 170‒178 https://doi.org/10.15302/J-ENG-2015035

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Acknowledgements

This research was carried out under project (M71.9.10380) in the framework of the Research Program of the Materials Innovation Institute M2i (www.m2i.nl). The authors would like to thank M2i for funding this project. Authors would also like to acknowledge TNO company for SPD measurements.
Compliance with ethics guidelines
Maryam Yazdan Mehr, Willem Dirk van Driel, and G. Q. (Kouchi) Zhang declare that they have no conflict of interest or financial conflicts to disclose.
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