Continuous-Wave Vertical Cavity Surface-Emitting Lasers based on Single Crystalline Lead Halide Perovskites

Lead halide perovskites are intriguing semiconductors for lasers due to high quantum yield, tunable bandgaps, and facile solution-process ability. However, limited by the weak optical confinement, continuous-wave (CW) pumped lasing, as one prerequisite for the electrically pumped lasing, is still challenging in bare lead halide perovskites without high-quality factor (Q) artificial optical cavity. Herein, the lasing emission in methylammonium lead tribromide (MAPbBr(3)) incorporated with a vertical microcavity under continuous pumping at 80 K is reported. The single-crystalline MAPbBr(3) perovskite nanoplates are fabricated by the two-step solution method. The MAPbBr(3)-based vertical cavity surface-emitting laser (VCSEL) presents a low threshold of 55.2 W cm(-2) and a high Q-factor of 1140 at low temperature. The low threshold lasing emission can be attributed to strong optical confinement in the high-Q cavity and great photoluminescence enhancement at 80 K, which is induced by a transition from tetragonal to orthorhombic phase, demonstrated by in situ temperature Raman spectroscopy. These findings envisage the prospective applications of single-crystalline metal halide perovskites in practicable laser devices.

Automated summary

Incorporating methylammonium lead tribromide (MAPbBr(3)) into a vertical microcavity under continuous pumping at 80 K results in lasing emission. Single-crystalline MAPbBr(3) perovskite nanoplates are fabricated using a two-step solution method. The MAPbBr(3)-based vertical cavity surface-emitting laser (VCSEL) exhibits a low threshold and high Q-factor at low temperature.