Room-Temperature Near-Infrared High-Q Perovskite Whispering-Gallery Planar Nano lasers

Near-infrared (NIR) solid state micro/nanolasers are improtant building blocks for true integration of optoelectronic circuitry.(1) Although significant progress has been made in III-V nanowire lasers with achieving NIR lasing at room temperature,(2-4) challenges remain including low quantum efficiencies and high auger losses. Imporatntly, the obstacles toward integrating one-dimensioanl nanowires on the planar ubquitous Si platform need to be effectively tackled. Here we demonstrate a new family of planar room-temperature NIR nanolasers based on organic-inorganic perovskite CH3NH3PbI3-aXa (X = I, Br, Cl) nanoplatelets. Their large exciton binding energies, long diffusion lengths, and naturally formed high quality planar whispering-gallery mode cavities ensure adequate gain and efficient optical feedback for low-threshold optically pumpbed in-plane lasing. We show that these remarkable wavelength tunable whispering-gallery nanolasers can be easily integrated onto conductive platforms (Si, Au, indium tin oxidie, and so forth). Our findings open up a new class of wavelength tunable palanar nanomaterials potentially suitable for on-chip integration.