Remaining challenges towards high brightness perovskite laser diodes

We are giving an overview of our work on ultrabright perovskite LEDs with the ultimate goal of injection lasing. Starting from the analysis of perovskite films in standard LED configurations, we can already identify beneficial operation conditions as cryogenic cooling and short electrical pulsing. By downscaling the active area of these devices, we reach current densities multiple kA/cm2 approaching the range expected to reach inversion in the recombination zone. In experiments combining nanosecond laser pulses of optical pumping and sub-microsecond electrical pulses of high voltages, we have been able to demonstrate the contribution of injected carriers to the overall net gain in a PeLED. In parallel, we have optimized distributed feedback resonators for perovskite lasers and their possible integration in light emitting diodes. The combination of the opto-electrical analyses enables us to sketch a possible route towards a perovskite injection laser.