Preparation And Optical Properties Of All-inorganic CsPbX₃(X=Br,I) Perovskite Quantum Dots

In recent years,the all-inorganic perovskite quantum dots CsPb X₃?X=C l,Br,I?with its excellent optical properties,for example,the tunable emission wavelength in the entire visible light region,narrow full width at half maximum,high photoluminescence quantum yields and the facile synthesis method,have attracted much attention on their applications in the fields of perovskite solar cells,light-emitting diodes,photodetectors and biomedicine.This article mainly starts from the preparation of high-quality all-inorganic perovskite quantum dots.A series of CsPbBr₃ quantum dots and CsPbI₃quantum dots were prepared by thermal injection method and optimized thermal injection temperature for explore the difference in the optical properties.The main research contents of this paper are as follows:1.Preparation of all inorganic perovskite quantum dots CsPbX₃?X=Br,I?.The optimum reaction time was investigated from prepare CsPbBr₃ quantum dots.Then the quantum dots CsPb X₃?X=Br,I?was prepared by changing the thermal injection temperature via the thermal injection method,the temperature range is 140?-220?,and the temperature interval is 20?.2.All inorganic perovskite quantum dots CsPbX₃?X=Br,I?was characterized and analyzed.The obtained quantum dots CsPb X₃?X=Br,I?samples were tested.Through fluorescence spectrophotometer and ultraviolet-visible absorption spectrum test,the emission wavelength range of CsPbBr₃ quantum dots is 502 nm-532 nm,which has better coverage in the green light region,the emission wavelength of CsPbI₃ quantum dots range is 696 nm-727 nm,and it has good absorption in the high reaction temperature;through TEM test,the morphology and size distribution of CsPbX₃?X=Br,I?are obtained;through Fourier infrared and fluorescence lifetime test,we explored the effect on the properties of perovskite quantum dots CsPbX₃?X=Br,I?with different reaction temperatures.3.Preparation and properties of all inorganic perovskite quantum dots CsPbX₃?X=Cl,Br,I?composite film.The CsPbX₃?X=C l,Br,I?quantum dots solution was mixed with PMMA to prepare composite film.From characterization analysis,the composite film had good fluorescence properties.