Syntresis And Characterization Of Organic-inorganic Hybrid Perovskite Polymer Composites

The organic/inorganic hybrid perovskite-structured material MAPb X3 have unique photophysic properties for the combination of the excellent mechanical properties and electron mobility of the organic and inorganic materials.These materials have shown potential applications in solar cells,electroluminescence,laser devices and sensors.However,the organic/inorganic hybrid perovskite nanomaterials are unstable and easily decompose in humid,high temperature or oxygen environments,resulting in a decrease in optical performance.In order to overcome these problems,in this thesis,we prepared the composite matierial of perovskite nanocrystals and PVDF polymer.By utilizing the encapsulation of the polymer host,we expect to improve the stability,uniformity and film forming properties of the perovskite nanocrystals.In this thesis,the photophysical and thermal characterization of perovskite nanocrystals and polymer composites have been characterized,and the following results have been obtained:1.The spontaneous emission attenuation mechanism of green-light and red-light-emitting perovskite nanocrystalline polymer composite films was tested by time-resolved fluorescence spectroscopy.The red-emitting MAPb I3 perovskite nanocrystals have a shorter upper than the green-emitting MAPb Br3.However,the smaller bandwidth increases the probability of non-radiative decay of red-emitting perovskite nanocrystals.The green light-emitting MAPb Br3 nanocrystalline composite film shows superior application values.2.The transient photophysical properties of MAPb Br3 nanocrystalline composite film were further studied by femtosecond pump-probe detection method.The stimulated radiation characteristics and two-photon excitation characteristics of the material have been obtained,which provides a foundation for the research of new laser materials.3.For the first time,we fabricate the MAPb Br3/PVDF composite nanofibers by electrospinning method.It was found that the perovskite nanocrystalline composite nanofiber retains the photophysical properties of the composite film and has excellent thermal properties and is expected to be applied to the research of flexible nanofiber lasers.