Exploring the regulatory effect of organic-inorganic hybrid perovskites on the third-order nonlinear optical (NLO) properties of MOFs is of great significance. In this work, we used Co-MOF Co1. 25 (HL) 0. 5 (Pz-NH2) 0. 25 (μ3-O) 0. 25 (μ2-OH) 0. 25 (H2O) ·0. 125 Co·0. 125 L·10. 25 H2O (where L = 5, 5'- (1H-2, 3, 5-triazole-1, 4-diyl) diisophthalic acid) as the host framework and confined the outstanding optical properties guest molecules AaPbXb X = Br or I; A = 4BrMBA (a = 2; b = 4) or MBA (a = 1; b = 3) into the cavities, investigating the regulatory effect of perovskite on the third-order NLO properties of Co-MOF. The third-order NLO tests indicated that Co-MOF displays saturated absorption and self-defocusing refraction behaviors, while AaPbXb@Co-MOF demonstrates excellent antisaturated absorption and self-focusing refraction properties. Furthermore, compared with AaPbXb, the third-order nonlinear optical intensity of AaPbXb@Co-MOF has increased by 3 times. Femtosecond transient absorption spectroscopy (fs-TAS), time-resolved pump-probe spectroscopy, and theoretical calculations were employed to investigate the regulatory mechanism of the NLO properties, revealing that Co-MOF exhibits a ground-state bleaching mechanism, (R-4BrMBA) 2PbBr4 displays a two-photon absorption mechanism, and (R-4BrMBA) 2PbBr4@Co-MOF demonstrates two-photon absorption and two-photon-induced excited-state absorption mechanisms. This study provides a reference for perovskite regulation of MOFs' NLO performance.
Ge et al. (Fri,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: