Optical Properties And Stability Of CsPbBr₃ Perovskite Quantum Dots

Perovskite quantum dots have excellent optical properties in the fields of illumination,display,laser and solar cells due to their excellent spectral properties such as narrow spectral lines,high luminous efficiency and tunable emission wavelength.However,the instability of perovskite material properties,especially in the air,is easily decomposed by moisture,which seriously affects the luminescence properties of perovskite materials and has always restricted its application in optoelectronic devices.In this paper,the optical properties and luminescence stability of perovskite CsPbBr₃ quantum dots with higher quantum efficiency are studied,and various optical treatments and luminescence stability are improved by various treatment methods,which are all inorganic perovskite materials in the field of optics.The application provides a theoretical basis.1)Study on the effect of dehydroxylation of silicon substrate on the luminescence stability of perovskite quantum dot films:The Si substrate was subjected to dehydroxylation treatment using hydrofluoric acid to remove the surface SiO₂ film,and the perovskite quantum dots were respectively coated on the surface of the substrate before and after the dehydroxylation treatment.Through the characterization of the surface of the substrate surface and the contact angle test with water,it is proved that the surface of the Si substrate after dehydroxylation treatment with hydrofluoric acid becomes rough and the hydrophobicity is enhanced;The photoluminescence test proved that the dehydroxylated Si substrate can improve the luminescence stability of the perovskite CsPbBr₃ quantum dots.2)Study on the effect of hydrophobic molecular sieve on the optical properties and luminescence stability of perovskite quantum dots:The hydrophobic molecular sieve material is mixed in the perovskite CsPbBr₃ quantum dots,and the perovskite CsPbBr₃quantum dot material is used to form a perovskite composite material having hydrophobic,dispersion,stability and the like,and the mixture is mixed.The composite material was spin-coated on a Si substrate for structural and optical properties.It is shown that the composite perovskite CsPbBr₃ quantum dots mixed with hydrophobic molecular sieve have the same structure as the pure perovskite CsPbBr₃ quantum dots and exhibit excellent optical stability in temperature and time-dependent photoluminescence spectroscopy.3)Synthesis of perovskite CsPbBr₃ nanowires by hydrophilic molecular sieves and their optical properties:The nucleation growth of perovskite CsPbBr₃ nanowires was achieved by adding hydrophilic molecular sieve SBA-15 to perovskite CsPbBr₃ quantum dots.The morphology and optical properties of the samples were characterized by transmission electron microscopy and photoluminescence.The results show that the perovskite CsPbBr₃ nanowires are successfully synthesized and exhibit good optical stability in temperature and time-dependent photoluminescence spectra.