The researchers, Parthiban Santhanam and co-authors from MIT, published their study in a Physical Review Letters, saying that the key to achieving a power conversion efficiency above 100 percent is to greatly decrease the applied voltage, physorg.com reported.
In their experiments, the researchers reduced the LED’s input power to just 30 picowatts (0.030 nanowatt) and measured an output of 69 picowatts of light -- a 230 percent efficiency.
