  Solution-processed organic-inorganic lead halide perovskites have recently
emerged as promising gain media for tunable semiconductor lasers, and have come
to rival inorganic III-V group semiconductors as the material candidate for
chip-scale lasers. Although electrically pumped lasing at room temperature is
the ultimate goal, optically pumped continuous-wave lasing at room
temperature,a prerequisite for a laser diode,has not been achieved so far.
Here, we report lasing action in a surface emitting distributed feedback
methylammonium lead iodide (MAPbI3) perovskite laser on silicon substrate, at
room temperature under continuous-wave optical pumping, in ambient air
environment. This outstanding performance is achieved by the ultra-low lasing
threshold of 13 W/cm2, which is enabled by the thermal nanoimprint lithography
that directly patterns perovskite into a high Q cavity with large mode
confinement, while at the same time improves perovskite emission
characteristics. Our results represent a major step toward the realization of
perovskite laser diodes, which is essential in the future insertion of
perovskite lasers into photonic integrated circuits, for applications in
optical computing, sensing and on-chip quantum information.
