Perovskite-based LEDs are beginning to rival OLEDs in terms of efficiency

Perovskites have generated huge interest in recent years because of their potential for solid-state lighting and displays, despite lagging behind other state-of-the-art technologies in efficiency and longevity. Now two independent teams have reported light-emitting diodes (LEDs) based on perovskites that have surpassed a milestone in efficiency [Cao et al., Nature (2018), https:// doi.org/10.1038/s41586-018-0576-2; Lin et al., Nature (2018), https://doi.org/10.1038/s41586-018-0575-3].