What They Say
Nature has published a paper that describes new perovskite LEDs (PeLEDs) made from perovskite nanocrystals (around 10nm) that have a coating of benzylphosphonic acid (BPA) via a ‘simple reaction’. The article said:
The BPA shell passivates the undercoordinated lead atoms by forming covalent bonds, and thereby greatly reduces the trap density while maintaining good charge-transport properties for the 3D perovskites. We demonstrate simultaneously efficient, bright and stable PeLEDs that have a maximum brightness of approximately 470,000?cd?m², maximum external quantum efficiency of 28.9% (average?=?25.2?±?1.6% over 40 devices), maximum current efficiency of 151?cd?A?1 and half-lifetime of 520?h at 1,000?cd?m² (estimated half-lifetime >30,000?h at 100?cd?m²).
The group included researchers from Seoul National University and the Cavendish Laboratory of the University of Cambridge as well as one from Peroled Co Ltd.
What We Think
These are impressive statistics in terms of output, EQE, efficacy and lifetime. If the process for making the LEDs really is simple, this could be something of a game changer. (BR)
