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Color Quality of White LEDs

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III-Nitride Based Light Emitting Diodes and Applications

Part of the book series: Topics in Applied Physics ((TAP,volume 133))

Abstract

This chapter provides an overview of the fundamentals of chromaticity and color rendering, the two important aspects of color quality of light sources for general illumination. There is a special focus on the use of solid-state light sources. The section on chromaticity discusses chromaticity coordinates and diagrams, correlated color temperature (CCT), Duv, and specifications for color differences. The section on color rendering discusses object color evaluation, the color rendering index (CRI) and the shortcomings thereof, and color quality beyond CRI, introducing the color quality scale (CQS) as a design tool. The chapter also discusses luminous efficacy of radiation and the color characteristics used for single-color LEDs. Finally, future considerations on color quality for white LED developments are given.

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Notes

  1. 1.

    Incandescent lamp with its glass envelope doped with neodymium, which absorbs much of the yellow portion of the lamp spectrum. This type of lamp is popularly sold in the USA and some other countries.

  2. 2.

    CMCCAT represents Color Measurement Committee (of the Society of Dyers and Colourists for predicting the degree of color inconsistency of surface colors) Chromatic Adaptation Transform.

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Author information

Authors and Affiliations

  1. National Institute of Standards and Technology, Gaithersburg, USA

    Yoshi Ohno

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  1. Yoshi Ohno
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Correspondence to Yoshi Ohno .

Editor information

Editors and Affiliations

  1. Department of Materials Science and Engineering, Korea University, Seoul, Korea (Republic of)

    Tae-Yeon Seong

  2. Department of Electrical Engineering, Yale University, New Haven, Connecticut, USA

    Jung Han

  3. Department of Electrical Engineering and Computer Science, Nagoya University, Nagoya, Aichi, Japan

    Hiroshi Amano

  4. Department of Electrical and Computer Engineering, Virginia Commonwealth University, Richmond, Virginia, USA

    Hadis Morkoç

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Ohno, Y. (2017). Color Quality of White LEDs. In: Seong, TY., Han, J., Amano, H., Morkoç, H. (eds) III-Nitride Based Light Emitting Diodes and Applications. Topics in Applied Physics, vol 133. Springer, Singapore. https://doi.org/10.1007/978-981-10-3755-9_16

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