LED efficiency droop explained
LEDs are less efficient at higher currents: this well-known mystery has meant that LED lighting performs very well in small scale applications but becomes less economical when you need a lot of light. A team of researchers based at UCSB and the École Polytechnique in Paris have figured out why: “a complex non-radiative process known as Auger recombination [is] behind nitride semiconductor LED droop, whereby injected electrons lose energy to heat by collisions with other electrons rather than emitting light”.
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