Manipulating stimulated‐emission processes and overcoming the ohmic loss of metals in plasmonic lasers are of significance for the according applications in biological sensors, data storage, photolithography, and optical communications. Herein, through utilizing an electrochemical‐assisted growth method for high‐quality perovskite nanowires, plasmonic lasers based on the structure of metal/dielectric layer/perovskite nanowires are constructed. The plasmonic lasers demonstrate a threshold of 62 µJ cm−2, a high quality factor of Q ≈ 655, and a fast lasing decay time of 1.6 ps. Interestingly, the plasmonic lasers present an attractive capability in transformation from single mode to multiple modes just by adjusting the pumping energy. In addition to the broad stoichiometry‐dependent tunability of the perovskite materials, the proposed plasmonic lasers have great promise in real applications.

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Cesium lead halide (CsPbBr3) perovskite nanomaterials exhibit attractive optical properties, particularly in higher nonlinear optical effects and larger multiphoton absorption efficiency, compared with conventional semiconductors. The unique feature of stable lasing action under photon pumping conditions grants such materials great potential in photonics. Herein, through an in-depth study of the growing mechanism, all-inorganic perovskite nanomaterials with a high crystalline quality and tunable morphologies were synthesized, by a modified physical vapor deposition procedure. The prepared nanowire laser not only presents a high-performance laser output under single-photon pumping conditions, but also maintains decent behavior under two-photon pumping conditions. Importantly, the temperature-dependent fluorescence spectroscopy test of the nanowires reveals that the high exciton binding energy, twice as large as the thermal disturbance at room temperature, is the dominant reason for maintaining stable lasing under high energy density injection conditions.