Electrically driven lasing from a dual-cavity perovskite device - Nature

"Metal halide perovskites are an emerging class of semiconductors11,12 combining remarkable optoelectronic properties with cost-effective solution processability. Apart from the rapid advances in solar cells13,14,15 and LEDs16,17,18,19,20,21,22, the unique attributes of high gain coefficients, long carrier lifetimes and tunable emission wavelengths have made perovskites excellent optical gain media for lasing applications1,2,3,4,5,6,7,8. Room-temperature, continuous wave lasing from perovskite semiconductors was demonstrated under optical pumping4,23,24,25,26, highlighting the promising progress in the field."

"The success of conventional semiconductor lasers builds on the ability of electrically driving the lasing action27,28,29, allowing them to be easily integrated with a range of optoelectronic device platforms. However, for halide perovskites, the realization of electrically driven lasing remains a great challenge because of the inability to achieve intense electrical injection into high-quality perovskite resonant cavities. High currents can lead to severe material degradation and efficiency roll-off, whereas standard optical cavity designs are poorly compatible with the perovskite device architectures30,31,32,33."

Metal halide perovskites combine high gain coefficients, long carrier lifetimes and tunable emission wavelengths with cost-effective solution processability. Room-temperature continuous-wave lasing has been demonstrated from perovskite semiconductors under optical pumping. Electrically driven lasing has been challenging due to the inability to inject intense electrical currents into high-quality perovskite resonant cavities without causing material degradation and efficiency roll-off. A vertically stacked dual-cavity device integrates a low-threshold perovskite single-crystal microcavity with a high-power microcavity PeLED sub-unit to concentrate optical power into the perovskite cavity. Under pulsed electrical excitation the device achieves a lasing threshold of about 92 A cm−2 at around 22 °C in air, roughly 30 times lower than prior electrically driven integrated organic lasers.

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