Self-Generated Buried Submicrocavities for High-Performance Near-Infrared Perovskite Light-Emitting Diode

Synergistic effect triggers the Ostwald ripening for the downward recrystallization of perovskite to form buried submicrocavities as light output coupler. The simulation suggests the buried submicrocavities can improve the light out-coupling efficiency from 26.8% to 36.2% for near-infrared light. Light-emitting diodes yields peak external quantum efficiency increasing from 17.3% at current density of 114 mA cm −2 to 25.5% at current density of 109 mA cm −2 and a radiance increasing from 109 to 487 W sr −1  m −2 with low rolling-off.