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Colorimetry and efficiency of white LEDs : Spectral width dependence

Taylor, Elaine and Edwards, Paul and Martin, Robert (2012) Colorimetry and efficiency of white LEDs : Spectral width dependence. Physica Status Solidi A: Applications and Materials Science, 209 (3). pp. 461-464. ISSN 0031-8965

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    Abstract

    The potential colour rendering capability and efficiency of white LEDs constructed by a combination of individual red, green and blue (RGB) LEDs are analysed. The conventional measurement of colour rendering quality, the colour rendering index (CRI), is used as well as a recently proposed colour quality scale (CQS), designed to overcome some of the limitations of CRI when narrow-band emitters are being studied. The colour rendering performance is maximised by variation of the peak emission wavelength and relative intensity of the component LEDs, with the constraint that the spectral widths follow those measured in actual devices. The highest CRI achieved is 89.5, corresponding to a CQS value of 79, colour temperature of 3800 K and a luminous efficacy of radiation (LER) of 365 lm/W. By allowing the spectral width of the green LED to vary the CRI can be raised to 90.9, giving values of 82.5 and 370 lm/W for the CQS and LER, respectively. The significance of these values are discussed in terms of optimising the possible performance of RGB LEDs.

    Item type: Article
    ID code: 39520
    Keywords: spectral width, colorimetry, GaN, LED, Physics, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
    Subjects: Science > Physics
    Department: Faculty of Science > Physics
    Technology and Innovation Centre > Bionanotechnology
    Technology and Innovation Centre > Photonics
    Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 04 May 2012 11:37
    Last modified: 05 Sep 2014 19:10
    URI: http://strathprints.strath.ac.uk/id/eprint/39520

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