Fabry-Perot Oscillation and Room Temperature Lasing in Perovskite Cube-Corner Pyramid Cavities

Recently, organometal halide perovskite-based optoelectronics, particularly lasers, have attracted intensive attentions because of its outstanding spectral coherence, low threshold, and wideband tunability. In this work, high-quality CH3NH3PbBr3 single crystals with a unique shape of cube-corner pyramids are synthesized on mica substrates using chemical vapor deposition method. These micropyramids naturally form cube-corner cavities, which are eminent candidates for small-sized resonators and retroreflectors. The as-grown perovskites show strong emission approximate to 530 nm in the vertical direction at room temperature. A special Fabry-Perot (F-P) mode is employed to interpret the light confinement in the cavity. Lasing from the perovskite pyramids is observed from 80 to 200 K, with threshold ranging from approximate to 92 mu J cm(-2) to 2.2 mJ cm(-2), yielding a characteristic temperature of T-0 = 35 K. By coating a thin layer of Ag film, the threshold is reduced from approximate to 92 to 26 mu J cm(-2), which is accompanied by room temperature lasing with a threshold of approximate to 75 mu J cm(-2). This work advocates the prospect of shape-engineered perovskite crystals toward developing micro-sized optoelectronic devices and potentially investigating light-matter coupling in quantum optics.