In-Plane Anisotropic Nonlinear Optical Properties of Two-Dimensional Organic-Inorganic Hybrid Perovskite
In-Plane Anisotropic Nonlinear Optical Properties of Two-Dimensional Organic-Inorganic Hybrid Perovskite
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DOI：
10.1021/acs.jpclett.1c01890
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发表时间：
2021-07-21
影响因子：
5.7
通讯作者：
He, Jun
中科院分区：
文献类型：
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作者：
Chen, Zhihui;Zhang, Qi;He, Jun
二维(2D)有机-无机杂化钙钛矿(OIHP)具有优异的非线性光学(NLO)性能，在频率上转换应用方面显示出极大的通用性。光学各向异性在解释入射光子与晶体结构之间的相互作用中起着不可或缺的作用。最近，二维OIHP的面内各向异性非线性光学性质已被报道并引起了人们的广泛关注。然而，二维OIHP骨架与结构相关的NLO各向异性还没有得到很好的证实。本文系统地研究了(C6H5(CH2)(2)NH3)(2)PbI4(PEPI)、(C6H11NH3)(2)PbI4(C6H11)和(C4H9NH3)(2)PbI4(C4PI)的非线性光学性质，探讨了面内各向异性非线性光学响应与其晶格结构之间的关系。平面内非参数非线性光学响应，如双光子光致发光(2PPL)和三光子光致发光(3PPL)，对于PEPI、C6H11和C4PI都表现出相似的各向异性构型，无论是芳香族、环型还是线型有机分子；然而，THG信号的各向异性强烈依赖于单个薄片的特定晶体结构，并且它们远远高于多光子激发光致发光的各向异性。
Two-dimensional (2D) organic-inorganic hybrid perovskites (OIHPs) with superior nonlinear optical (NLO) properties show great versatility in frequency upconversion applications. Optical anisotropy plays an indispensable role in interpreting the interactions between incoming photons and crystal structure. Recently, the in-plane anisotropic NLO properties of 2D OIHPs have been reported and attracted much attention. However, the structure-related NLO anisotropy of the 2D OIHP framework is not well-established. Here, NLO properties of (C6H5(CH2)(2)NH3)(2)PbI4 (PEPI), (C6H11NH3)(2)PbI4 (C6H11), and (C4H9NH3)(2)PbI4 (C4PI) were systematically studied to interrogate the correlation between the in-plane anisotropic NLO responses and its lattice structure. In-plane nonparametric NLO responses, e.g., two-photon photoluminescence (2PPL) and three-photon photoluminescence (3PPL), manifest similar anisotropy configurations for PEPI, C6H11, and C4PI regardless of aromatic, cyclic, or linear organic molecules; however, the anisotropies of THG signals are strongly dependent on the specific crystal structures of the individual flakes, and they are much higher than that of the multiphoton excited photoluminescence.