Perovskite LEDs: Strategies to Improve Luminescence Efficiency of Metal‐Halide Perovskites and Light‐Emitting Diodes (Adv. Mater. 47/2019)

The narrow emission linewidths, easily tunable emission wavelengths, low cost, and high charge-carrier mobility of metal-halide perovskites make them well suited to act as natural light emitters. In article 1804595, Tae-Woo Lee and co-workers discuss the progress made in metalhalide perovskite light-emitting diodes since their appearance in 2014. The limiting factors of this technology—the photophysical properties of the crystals, morphological factors in layers made from them, and limitations in device architectures—and stategies to overcome these factors are explored.