Continuous-wave vertical cavity surface-emitting lasers based on single crystalline lead halide perovskites

Abstract

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, we report the lasing emission in methylammonium lead tribromide (MAPbBr3) incorporated with a vertical microcavity under continuous pumping at 80 K. The single-crystalline MAPbBr3 perovskite nanoplates were fabricated by the two-step solution method. The MAPbBr3 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 PL 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.