NREL's Solar Energy Research Facility is the site of experiments using lasers to probe the light-emitting properties of gallium indium phosphide alloys for making light-emitting diodes. Credit: NREL file photo.

NREL's Solar Energy Research Facility is the site of experiments using lasers to probe the light-emitting properties of gallium indium phosphide alloys for making light-emitting diodes. Credit: NREL file photo.