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Two-photon absorption of FAPbBr_(3) perovskite nanocrystals

Chinese Physics B 2023年第6期32卷 27-33页

作者：张轩宇肖书宇王雄彬贺廷超陈锐 Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

Perovskite nanocrystals(NCs) with high two-photon absorption(TPA) cross-section are of great interest due to their potential applications in three-dimensional optical data storage and multiphoton fluorescence microscopy. Among various perovskite materials, FAPbBr_(3) NCs show a better development prospect due to their excellent stability. However, there are few reports on their nonlinear optical properties. In this work, the nonlinear optical behavior of FAPbBr_(3) NCs is *** methods of multiphoton absorption photoluminescence saturation and open aperture Z-scan technique were applied to determine the TPA cross-section of FAPbBr_(3)NCs, which was around 2.76 × 10^(-45)cm^(4)·s·photon^(-1) at 800 nm. In addition,temperature-dependent photoluminescence induced by TPA was investigated, and the small longitudinal optical phonon energy and electron–phonon coupling strength was obtained, which confirm the weak Pb–Br interaction. Meanwhile, it is found that the exciton binding energy in FAPbBr_(3) NCs was 69.668 me V, which may be ascribed to the strong hydrogen bond interaction. It is expected that our findings will promote the application of FAPbBr_(3) NCs in optoelectronic devices.

关键词： FAPbBr_(3)nanocrystals two-photon absorption cross-section Z-scan multiphoton absorption photoluminescence saturation

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