Dynamically Tunable Single‐Particle Perovskite Microlaser/Plasmonic Laser in Liquid via Interfacial Chemistry

Abstract Perovskite microlasers with remarkable wavelength tunability have recently shown great promise in nanophotonics. However, to date, dynamic tuning of single‐particle perovskite microlasers remains challenging, hampering potential applications of miniaturized perovskite laser devices. Here interfacial chemistry methods that are widely used in perovskite photovoltaics are leveraged to realize dynamic modulation of perovskite microlasers. By altering molecules at the perovskite‐liquid interfaces, single‐mode lasing is dynamically and reversibly tuned. Laser mode selection takes places as mixed solutions are used and has been explained by interfacial competitive adsorption. The perovskite‐substrate interfaces can be further designed to switch the photonic laser to the plasmonic laser. These findings open a new perspective for achieving tunable miniaturized perovskite laser/plasmonic laser devices based on interfacial chemistry and engineering toward the applications in nanophotonics, sensing, and optical computing.