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What causes droop, the decline in an LED’s efficiency as the current passing through it is cranked up? Is it Auger recombination, or could it be carrier leakage? Both of these camps are dismissive of the other’s ideas, but maybe they shouldn’t be, because it is possible that it is the interplay between these two processes that gives a deeper insight into droop, suggest Marcus Deppner, Friedhard Römer and Bernd Witzigmann from the University of Kassel, Germany.