Controllable Synthesis Of Organic-inorganic Hybrid Perovskites And Their Excitonic Luminescence Properties

Organic-inorganic hybrid perovskites exhibit tunable absorption andphotoluminescence spectra, which originate from the adjustable excitons of theself-assembled quantum-well structures. In this dissertation, we explored the synthesis of2D organic-inorganic perovskites and investigated the pH and temperature excitonicluminescence properties. We fabricated organic-inorganic hybrid perovskites through a fastreprecipitation technique and explored the formation of quantum-well structure,temperature and pH photoluminescence spectra. The mainly achievements are listed asfollows:(1) The preparation of organic-inorganic hybrid perovskites powder through fastreprecipitation technique. We successfully fabricated organic-inorganic hybrid perovskitespowder through fast reprecipitation technique and explored the formation of quantum-wellstructure though controlling experimental parameters. We observed aggregation-inducedemission feature as well as reversible photoluminescence response to pH value.(2) Temperature-dependent photoluminescence spectra study. We tested the temperaturedependent photoluminescence spectra of organic-inorganic hybrid perovskites withdifferent alkyl chain, and revealed that organic-inorganic hybrid perovskites exhibited highsensitivity and good reversibility. To understand the temperature-dependent PL emission,we plot the PL emission peak change with temperature and fitted by applying the Varshiniequation. Furthermore, the potential applications of hybrid perovskites as temperaturesensor and NIR probe were demonstrated.(3) Dual-emissive organic-inorganic hybrid perovskites and their excitonic luminescenceproperties. We successfully fabricated organic-inorganic hybrid perovskites with two kindsof alkyl chain through the method of substitution and explored their dual emissiveproperties. To understand the temperature dependent PL emission, we tested thetemperature dependent photoluminescence response and analyzed the potential applicationof organometal hybrid perovskites in temperature sensor.