6:30 PM - 8:30 PM
▼ [13p-PB8-9] Optically pumped lasing in simple solution-processed single crystals of organometal halide perovskites
Keywords:perovskite single crystal,simple solution process,lasing
Interests in perovskites dated back over a century. Nowadays, organometallic halide perovskites allow outstanding photovoltaic performance and represent one of the most promising candidates for low-cost and efficient light emitting devices and lasing application. Guichuan Xing et al. have demonstrated that the bandgap of the perovskites, i.e. its emission color, can be tuned by varying the halide (chlorine, bromide, iodide) composition of the perovskite precursor solution. An advantage of the hybrid perovskite materials is their ability to combine the favorable properties of inorganic semiconductors (such as high carrier mobilities) with the flexibility and low-temperature processability of organic materials. Therefore, organometal halide perovskites become an ideal material for lasing and room-temperature light-emitting devices.
Here we introduce a simple solution process for the formation of large-scaled single-crystal organometal halide perovskites. We investigate room-temperature lasing properties in these planar single-crystal cavities.
CH3NH3PbClxBryIz solutions were prepared by mixing CH3NH3X with PbX2 (where X = Cl, Br or I) in N,N-dimethylformamide to give concentrations from 5 up to 60 wt%. Single-crystalline lead halide perovskites were prepared using a simple solution technique by drop-casting the solution on a glass or distributed Bragg reflector (DBR) substrate followed by capping the solution with a mica plate as schematically. Optical measurements were carried out with an excitation source of a second harmonics from a Ti:sapphire optical amplifier (lambda = 397 nm, 200 fs duration, 1 kHz). The crystal sample was excited from the substrate side at an incident angle of 20° and the emitted light from the normal of the top mica plate was collected with a CCD spectrometer or a synchro-scan streak camera.
Following slow evaporation of the DMF solvent, well-grown single crystals were precipitated between the substrate and mica. After several days, single crystals grew in a large scale. Lasing spectra taken from a single-crystal CH3NH3PbBr3 on glass were a function of excitation fluence. Above a threshold fluence of 11.9 mJ/cm2, multimode oscillations appear at lambda = 552.7 - 562.8 nm. According to its mode interval, such multimode lasing originates from edge-emitting amplification in specific stripe-shape crystal. We also investigate surface-emitting vertical cavity lasers from the crystal grown on DBR.
Here we introduce a simple solution process for the formation of large-scaled single-crystal organometal halide perovskites. We investigate room-temperature lasing properties in these planar single-crystal cavities.
CH3NH3PbClxBryIz solutions were prepared by mixing CH3NH3X with PbX2 (where X = Cl, Br or I) in N,N-dimethylformamide to give concentrations from 5 up to 60 wt%. Single-crystalline lead halide perovskites were prepared using a simple solution technique by drop-casting the solution on a glass or distributed Bragg reflector (DBR) substrate followed by capping the solution with a mica plate as schematically. Optical measurements were carried out with an excitation source of a second harmonics from a Ti:sapphire optical amplifier (lambda = 397 nm, 200 fs duration, 1 kHz). The crystal sample was excited from the substrate side at an incident angle of 20° and the emitted light from the normal of the top mica plate was collected with a CCD spectrometer or a synchro-scan streak camera.
Following slow evaporation of the DMF solvent, well-grown single crystals were precipitated between the substrate and mica. After several days, single crystals grew in a large scale. Lasing spectra taken from a single-crystal CH3NH3PbBr3 on glass were a function of excitation fluence. Above a threshold fluence of 11.9 mJ/cm2, multimode oscillations appear at lambda = 552.7 - 562.8 nm. According to its mode interval, such multimode lasing originates from edge-emitting amplification in specific stripe-shape crystal. We also investigate surface-emitting vertical cavity lasers from the crystal grown on DBR.