Hybrid nanohole LED design suppresses efficiency droop

Publishing their results in the Applied Physics Letters, a team of Chinese researchers have drastically improved the efficiency of white light LEDs through a hybrid approach, filling nanoholes in a blue InGaN/GaN LED structure with nanocrystals. Key to the improvement in colour conversion efficiency (CCE) is the reliance on an efficient non-radiative resonant energy transfer instead of the radiative pumping that would typically prevail when combining a blue InGaN/GaN LED with down-conversion materials, such as phosphors or even semiconductor nanocrystals (NCs), they write.