Researchers at Korea's Pohang University developed a perovskite LED (PeLED) - that could be used to create displays and lighting panels, one day. PeLEDs have been shown before - but with very limited luminous efficiency. Now the researchers claim that the efficiency of their PeLEDs compete with phosphorescent OLEDs.
The main problem in PeLEDs has been the significant exciton dissociation in perovskite layers. The researchers managed to overcome this by fine stoichiometric tuning that prevents exciton dissociation, and also by nanograin engineering that reduces perovskite grain size, and concomitantly decreases exciton diffusion length.