Researchers from California and Japan have created a new design for green and blue LEDs that address efficiency droop, a dramatic drop in efficiency at high currents.
Blue and green LEDs provide the essential hues that emit the same white light expected from household bulbs, but they are also among the hardest to engineer and suffer the most from droop. By changing the crystal structure orientation in semiconductor films, the team created LEDs with high efficiency and extremely low droop.
They were also able to fabricate LED chips that are smaller than standard commercial LEDs, which could cut down on manufacturing costs.