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Crystals 2019, 9(1), 21; https://doi.org/10.3390/cryst9010021

Simultaneously Improve White LED Omni-Directional Package Efficacy and Spatial Color Uniformity on Scattered Photon Extraction Technology

Graduate Institute of Color and Illumination Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
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Received: 29 November 2018 / Revised: 23 December 2018 / Accepted: 26 December 2018 / Published: 30 December 2018
(This article belongs to the Special Issue Advanced LED Solid-state Lighting Optics)
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Abstract

The Scattered Photon Extraction (SPE™) based on the concept of TIR lens combined with remote phosphor is proven to be one of the effective solutions for improving white LED efficiency, and it provides the omnidirectional light distribution for luminaire design. Not only the light extraction efficiency (LEE) is important, but also the angular uniformity of correlated color temperature (CCT) is a critical index in the evaluation of high-quality white LEDs. A non-optimized SPE™ will cause an increase in the angular CCT deviation (ACCTD) and ultimately affect lighting quality. Two possible ways using lens design are proposed to reduce the ACCTD and even improve its efficiency. Among them, using the concept of light guiding to design the lens can minimum the deviation of forward and backward CCT from 2720 K to 657 K, and the overall efficiency can be further enhanced by 12% compared to typical SPE™ lens. View Full-Text
Keywords: white LEDs; remote phosphor; light extraction efficiency; spatial color uniformity white LEDs; remote phosphor; light extraction efficiency; spatial color uniformity
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Lee, T.-X.; Huang, Y.-C. Simultaneously Improve White LED Omni-Directional Package Efficacy and Spatial Color Uniformity on Scattered Photon Extraction Technology. Crystals 2019, 9, 21.

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