Giant Nonlinear Optical Response of Lead-Free All-inorganic CsSnBr3 Nanoplates
Giant Nonlinear Optical Response of Lead-Free All-inorganic CsSnBr3 Nanoplates
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无铅全无机 CsSnBr3 纳米板的巨大非线性光学响应
DOI：
10.1021/acs.jpcc.0c09753
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发表时间：
2021-01-05
影响因子：
3.7
通讯作者：
Yang, Zai-xing
中科院分区：
文献类型：
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作者：
Liu, Dong;Liu, Junting;Yang, Zai-xing
具有大非线性光学响应的非线性光学材料的探索促进了各种各样的光子应用。钙钛矿半导体材料以其优异的光电性能在非线性光学领域受到越来越多的关注。本文首次采用固体源化学气相沉积法在云母衬底上成功合成了无铅全无机钙钛矿CsSnBr3纳米板。通过调节生长时间可以很好地控制制备的CsSnBr3纳米片的厚度，这表明它们在结晶度、光致发光（PL）和NLO响应中起着重要作用。随着厚度的增加，x射线衍射和PL的峰值强度增加，而NLO响应的非线性吸收系数、非线性折射率等性能参数相应降低。光的自吸收效应有助于这种与NLO响应相反的现象。值得指出的是，在532 nm处的非线性吸收系数为（-6.86 +/- 0.10）× 10(4) cm.GW(-1)，在1064 nm处的非线性吸收系数为（2.39 +/- 0.07）× 10(4) cm.GW(-1)，是已报道的NLO材料中为数少的大值，在脉冲激光器、光开关、光调制器、光存储器等方面具有广阔的应用前景。等等。
The exploration of nonlinear optical (NLO) materials with a large NLO response promotes a diverse range of photonic applications. With excellent optoelectronics property, perovskite semiconductors have attracted more and more attention in the field of nonlinear optics. In this work, lead-free all-inorganic perovskites of CsSnBr3 nanoplates are synthesized successfully on mica substrates by the solid-source chemical vapor deposition method for the first time. The thickness of as-prepared CsSnBr3 nanoplates controlled well by adjusting the growth time demonstrates their important role in crystallinity, photoluminescence (PL), and NLO response. With the increase of thickness, the peak intensities of X-ray diffraction and PL increase, while the performance parameters of the NLO response, such as the nonlinear absorption coefficient, nonlinear refractive index, and so forth, decrease accordingly. A light self-absorption effect contributes to this opposite phenomenon of the NLO response. It is worth to pointing out that the reported nonlinear absorption coefficients of (-6.86 +/- 0.10) x 10(4) cm.GW(-1) at 532 nm and (2.39 +/- 0.07) x 10(4) cm.GW(-1) at 1064 nm are the few giant values among the reported NLO materials, promising the applications for pulsed lasers, optical switches, optical modulators, optical memories. and so forth.