1 Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China; 2 College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Abstract 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 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 NCs is studied. The methods of multiphoton absorption photoluminescence saturation and open aperture -scan technique were applied to determine the TPA cross-section of FAPbBr NCs, which was around cmsphoton 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 NCs was 69.668 meV, which may be ascribed to the strong hydrogen bond interaction. It is expected that our findings will promote the application of FAPbBr NCs in optoelectronic devices.
(Other nonlinear optical materials; photorefractive and semiconductor materials)
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62174079) and the Fund from the Science, Technology, and Innovation Commission of Shenzhen Municipality (Grant Nos. JCYJ20220530113015035, JCYJ20210324120204011, JCYJ20190808121211510, and KQTD2015071710313656).
Xuanyu Zhang(张轩宇), Shuyu Xiao(肖书宇), Xiongbin Wang(王雄彬), Tingchao He(贺廷超), and Rui Chen(陈锐) Two-photon absorption of FAPbBr3 perovskite nanocrystals 2023 Chin. Phys. B 32 064212
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