Enhanced Emission in Inorganic Halide Perovskite for Room Temperature Continuous-Wave Lasing

Continuous-wave (CW) lasers based on solution-processed semiconductors are crucial for scalable photonic integrated circuits. All-inorganic halide perovskites (IHP) are ideal gain materials for laser diodes because of their high photoluminescence (PL) quantum yield, tunable optical bandgap, superior stability, and solution processability. However, the CW lasing in IHP at room temperature (RT) has not been experimentally achieved. Here, the scalable synthesis of uniform IHP film is realized with a customized setup using a one-step solution route in ambient air. An enhanced emission from the I-rich phase inclusion and a reduced PL lifetime of the IHP matrix are observed after the formation of photon-induced phase segregation in the IHP film. A stable CW lasing with a threshold of 6.3 kWcm^-2 is demonstrated at RT in the IHP. The synthetic IHP is promising for coherent light sources and on-chip integrated photonics.