What They Say
A group of researchers from around the world, but with lead authors at Linköping University in Sweden, have developed new ‘spectrally stable’ blue perovskites over a wide range of emission wavelengths from 490 to 451 nanometres with the emission colour directly tuned by modifying the halide composition. The group said that it has achieved EQE values of 11.0% and 5.5% with emission peaks at 477 and 467?nm, respectively, using a vapour-assisted crystallization technique. This largely mitigates local compositional heterogeneity and ion migration.
The research was published in Nature Communications.
What We Think
One of the challenges in making RGB Perovskite LEDs is that the blue devices degrade to green in their lifetime, so achieving stability is critical to commercialisation. However, there is a huge amount of work going on both in halide perovskites and non-halide materials. (BR)
