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2015, Volume 1, Issue 2

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Engineering >> 2015, Volume 1, Issue 2 doi: 10.15302/J-ENG-2015035

Progress in Understanding Color Maintenance in Solid-State Lighting Systems

1 Delft University of Technology, Delft 2600 AA, the Netherlands
2 Material Innovation Institute (M2i), Delft 2628 XG, the Netherlands

Received: 2015-04-09 Revised: 2015-06-26 Accepted: 2015-06-30 Available online: 2015-06-30
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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.

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