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Four-color laser white illuminant demonstrating high color-rendering quality

A. Neumann, J. J. Wierer, W. Davis, Y. Ohno, S. R. J. Brueck, and J.Y. Tsao

Open Access Open Access

Abstract

Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers, however, has a much narrower spectral linewidth than light emitted from LEDs or phosphors. Therefore it is a common belief that white light produced by a set of lasers of different colors would not be of high enough quality for general illumination. We tested this belief experimentally, and found the opposite to be true. This result paves the way for the use of lasers in solid-state lighting.

©2011 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Schematic of four-color laser white illuminant. Light from four lasers is combined using chromatic beam-splitters, then passes through multiple ground-glass diffusers to reduce speckle before illuminating the test objects.

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Fig. 2
Fig. 2 Chromaticities of the laser and reference illuminants. CIE (Commission Internationale de l'Eclairage) 1976 (u',v') diagrams showing the chromaticities of the RYGB laser (black circles) and reference (white circles) white light illuminants, and of the four lasers themselves (colored black-outlined circles).

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Fig. 3
Fig. 3 (Left) Power spectral densities of the various illuminants: laser illuminants in black (with scale on left-axis); reference illuminants in white (with scale on right-axis). (Right) Summary of preferences: between the laser and reference illuminants in black; and between the reference illuminants in white. Vertical dashed black and white lines are the means of the preference distributions, where the degree preferences were assigned numerical values of −3,-2,-1,0,1,2,3.

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Fig. 4
Fig. 4 White light (left), shown composed of four narrow spectral lines, reflects off an orange. The orange preferentially reflects red and yellow and hence the L and M cones of the eye are preferentially stimulated. The brain compares the cone responses and interprets the color of the object to be a particular shade of orange.

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Tables (1)

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Table 1 Properties of Illuminants and Results of Comparisons between Illuminantsa

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