Nonlinear Optical Absorption and Refraction Effects of CsPbBr3 Perovskite Quantum Dots
CsPbBr3 perovskite quantum dots were prepared,and their nonlinear optical ab-sorption and refraction effects were studied.Measured by femtosecond laser Z-scan technolo-gy at 400 nm and 800 nm excitation wavelengths,it is found that CsPbBr3 quantum dots ex-hibit saturation absorption and self-defocusing.The analysis showed that both effects origi-nated from single photon absorption,and the saturation absorption effect at 800 nm was ob-viously stronger than that at 400 nm,while the nonlinear refraction effect at 400 nm was ob-viously stronger than that at 800 nm.Compared with other perovskite materials,CsPbBr3 quantum dots prepared in this paper show excellent nonlinear absorption and refraction char-acteristics.
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