Two-photon Pumped Lasing Properties Of MAPbBr₃ Perovskite

Recently,organic-inorganic hybrid perovskites have shown their extraordinary potential in the field of solar cells.With the deepening of research,their photoelectric properties,such as high visible light absorption efficiency,high fluorescence quantum yield,low defect density and long carrier migration distance,have been found out,which makes organic-inorganic perovskites a hotspot of research.Lead bromide methylamine CH₃NH3PbBr₃?MAPbBr₃?,as a three-dimensional hybrid perovskite material with direct band gap,is a great gain medium.It predicts great potentiality in light emitting devices such as light emitting diodes?LEDs?and nano-lasing.However,the nano-lasing based on MAPbBr₃ perovskite,in previous studies,are usually achieved directly in the nanowires or microplates naturally and randomly synthetized,which goes against the production of nanolasing with controllable structure and mode,and it's also hard to meet the practical needs.In this paper,we deposited MAPbBr₃ single crystals in an efficient way.Combining them with the distributed Bragg reflector designed by ourselves,we introduced a vertical cavity surface emitting laser?VCSEL?.The experimental results show that VCSEL based on MAPbBr₃ perovskite can regulate the output mode of lasing effectively compared with nanowires microplates,which leads to a single mode lasing.The main contents of this paper are as follows:1.MAPbBr₃ perovskite nanomaterials were prepared by a solution method,and optical microscopy,scanning electron microscopy and X-ray diffraction were carried out to characterized the morphology of MAPbBr₃ perovskite.The results show that the MAPbBr₃ perovskite prepared is in good crystal quality.2.Optical measurement of perovskite microcrystals was carried out on a reflective micro-test platform.The results show that the perovskite microcrystals prepared have good characteristics in two-photon photoluminescence.On this basis,we also achieved the whispering gallery mode?WGM?perovskite microlasing.3.A high quality distributed Bragg Reflector?DBR?was designed and fabricated on our own.After that,the vertical cavity surface emitting lasing was successfully brought about by integrating our grown MAPbBr₃ perovskite microcrystals with the DBR thin film,and the performance of the VCSEL was systematically studied...