What They Say
A group from European, US and several Korean universities has produced a paper, published in the prestigious ‘Nature’ journal, that highlights the development perovskite nanocrystal LEDs of colour-stable red emissions, centred at 620 nanometres, that reach EQE of 20.3%. A key part of the process is the ‘cleaning’ of the nanocrystal surface to remove lead atoms.
The group said that density functional theory calculations reveal that the binding between the ligands and the nanocrystal surface suppresses the formation of iodine Frenkel defects, which in turn inhibits halide segregation.
What We Think
Up to now, the group said, this kind of perovskite efficiency has been seen for green and ultraviolet LEDs, but not for red. (BR)
Crystal structure of cubic lead halide perovskites with the generic chemical formula APbX3 Image:LED Professional
