As noted by Kroemer 25 Braunstein "had set up a simple optical communications link: Music emerging from a record player was used via suitable electronics to modulate the forward current of a GaAs diode. Department of Energy", L-Prize Website, August 3, 2011 LED There Be Light, Scientific American, March 18, 2009 Eisenberg, Anne (June 24, 2007). Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors. 173 LEDs used in communications devices can have even faster response times. LED sources can be shaped in several configurations (spot lights for reflective illumination; ring lights for coaxial illumination; backlights for contour illumination; linear assemblies; flat, large format panels; dome sources for diffused, omnidirectional illumination).
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