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18 November 2016 Spot phosphor concept applied to a remote phosphor light-emitting diode light engine
Paula C. Acuna Roncancio, Youri Meuret, Geert Deconinck, Peter Hanselaer
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Optical Engineering, Vol. 55, Issue 11, 115103 (November 2016). https://doi.org/10.1117/1.OE.55.11.115103
Abstract
Although remote phosphor technology outperforms conformal phosphor technology for midpower applications, one of the limiting factors due to its impact on the total cost is the amount of phosphor required. Furthermore, an important loss mechanism in remote phosphor light-emitting diode (LED) technology is the reabsorption of recycled, downconverted light by the phosphor. An obvious solution to this issue is to enable a light path for the converted light, such that further interactions with the phosphor element are avoided. We propose a spot phosphor concept to achieve this goal. To explore this configuration, a simulation model of a phosphor element is devised and validated. The optical input parameters are based on experimental data and the application of the inverse adding-doubling method. The resulting configuration, along with a long-pass filter, is shown to be a potential solution for reduction of phosphor usage. The moderate decrease in the light extraction ratio (LER) when applying the spot concept is partly attributed to the losses in the secondary optics needed to narrow the LED beam; the combination of the spot concept configuration with a directional light source such as a laser diode is shown to be a powerful combination for the enhancement of the LER.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Paula C. Acuna Roncancio, Youri Meuret, Geert Deconinck, and Peter Hanselaer "Spot phosphor concept applied to a remote phosphor light-emitting diode light engine," Optical Engineering 55(11), 115103 (18 November 2016). https://doi.org/10.1117/1.OE.55.11.115103
Published: 18 November 2016
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Cited by 2 scholarly publications.
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KEYWORDS
Light emitting diodes
Scattering
Reflectivity
Compound parabolic concentrators
Light scattering
Line edge roughness
Chemical elements
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