Researchers from the University of Michigan, led by Prof. Zetian Mi, have developed a new 3D Nanowire red microLED emitter that achieves a very narrow emission spectrum - an FWHM of 5nm at 617 nm, about one order of magnitude narrower than previously reported values. A narrow emission spectrum helps to realize wide color gamuts.
To achieve this high performance, the researchers realized a nanowire photonic crystal (PhC) structure that reforms the radiation behavior of red-emitting InGaN micro-LEDs.
The researchers report that in the new devices, the chromaticity property is highly stable with varying injection currents due to the coupling of emission to photonic band edge mode. A high EQE of over 10% was measured from micro-LEDs with a size of 1 micron.
