STUDY OF THE ROOM-TEMPERATURE LASING OF LEAD BROMIDE PEROVSKITE THIN FILMS VIA SOLVENT ENGINEERING

Tóm tắt

Recent years have seen a significant surge in attention towards hybrid metal-halide perovskites, primarily for their remarkable optoelectronic properties: long carrier lifetimes; direct bandgaps--and large absorption coefficients. Although we've demonstrated the use of low-temperature solution-processed perovskites for lasing, achieving this at room temperature still poses an ongoing challenge. This study introduces our innovative approach—a solvent-engineering technique—to fabricate lead bromide perovskite thin films and create dense surface morphologies that promote roomtemperature lasing. We achieved the production of homogeneous perovskite films with enhanced optical properties by optimizing precursor solutions and deposition parameters. Photoluminescence measurements demonstrated efficient room-temperature lasing above a specific optical pumping density, characterized by sharp emission peaks and narrow linewidths. The dense morphology of the perovskite films found confirmation through scanning electron microscopy, while multi-peaks in lasing modes indicated random lasing phenomena presence. The feasibility of room-temperature lasing in lead bromide perovskite thin films shines through our findings, underlining the potential for practical applications as compact and energy-efficient laser sources