Low Threshold Single-Mode Lasing from CsPbBr3 Nanorods

However, constrained by the synthesis strategy and intrinsic fast nucleation and growth kinetics, most of reports focused on lasing from perovskite nanocubes. One-dimensional nanorods (NRs) with large photon absorption cross-section and high optical gain are hard to synthesize and remains largely unexplored.

Herein, we realized the controlled synthesis of high-quality CsPbBr3 NRs through a modified B-site cation exchange from Zn(II) to Pb(II). These NRs exhibit a long carrier lifetime of 96 ns, gain coefficient of 155 cm-1, and low threshold amplified spontaneous emission (ASE) of 2.71 μJ cm-2. Due to their intrinsic shape anisotropy, ASE shows pronounced linear polarization with a degree of ~0.31.