Perovskite light-emitting diode
Perovskite light-emitting diodes (PeLEDs) are candidates for display and lighting technologies. Researchers have shown interest in perovskite light-emitting diodes (PeLEDs) owing to their capacity for emitting light with narrow bandwidth, adjustable spectrum, ability to deliver high color purity, and solution fabrication.
Source: Wikipedia — Perovskite light-emitting diode (CC BY-SA 4.0)