Abstract
The realization of tunable nonlinear optical (NLO) responses in a single nano-/micro-structure is extremely important. However, in lack of effective ways to integrate multiple performances, it still faces severe limitations during applications. Herein, we demonstrate a wavelength-dependent NLO micro-structure based on host-guest metal-organic framework (MOF) materials through encapsulating linear dye molecules into periodic one-dimensional (1D) channels. The confinement to non-centrosymmetric polar dye molecules enhances the second-/third-order NLO responses of the hybrid crystals, causing obvious two-photon luminescence (TPL), second harmonic generation (SHG) and third harmonic generation (THG) responses in the as-prepared composites. The highly ordered structures of MOFs impart spatial regulation on the linear dye molecules to realize orientation alignment, resulting in the polarized anisotropy emission. NIR-to-NIR (NIR, near-infrared region) two-photon pumped lasing is realized with the natural whispering gallery mode resonance cavities of MOFs under the excitation of a 1200-nm fs laser. Furthermore, tunable NLO properties such as TPL, SHG and THG are achieved through switching the incident excitation wavelength from 800 to 1500 nm. Such hybrid materials with tunable NLO responses may open a new avenue toward designing multifunctional NLO devices in the future.
摘要
本文通过采用原位自组装工艺将线形有机染料分子组装在 具有一维孔道的金属-有机框架材料(MOFs)中, 成功制备了基于 主-客体系的复合晶态材料. MOFs的高度有序微孔结构赋予线形 染料分子以强烈的限域作用, 促使染料分子一维定向排列, 从而实 现材料的光学性能各向异性. 相比于无限域染料分子, 该复合材料 展示出显著增强的双光子发光性能(TPL), 并利用MOFs单晶晶面 形成的天然谐振腔实现了近红外波段的双光子激光(TPPL). MOFs 孔道中极性染料分子的有序组装使该复合晶体产生二阶/三阶非线 性光学响应, 获得了强的二次谐波(SHG)和三次谐波(THG)效应. 在800–1500 nm范围内调谐激发波长, 该材料展示出激发波长依赖 的非线性光学响应调谐性能, 获得TPL、TPPL、SHG和THG的多 重非线性光学性能. 上述结果为未来设计高效的非线性光学器件 开辟了一条简单有效的途径.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51632008, U1609219 and 61721005).
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Li H and Zhang L designed and performed the experiments, analyzed the data and wrote the paper; He H, Yang Y and Cui Y analyzed the data; Qian G conceived the framework of this paper and revised the paper. All authors contributed to the general discussion.
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The authors declare that they have no conflict of interest.
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Hongjun Li received his Bachelor’s degree in materials science and engineering from Northeastern University (2017). He is currently pursuing a PhD at the School of Materials Science and Engineering at Zhejiang University under the supervision of Prof. Guodong Qian. His research interest focuses on photonic MOF materials.
Guodong Qian received his Bachelor’s (1988) and Master’s (1992) degrees in materials science from Zhejiang University. He was promoted to Associate Professor, Full Professor, and Cheung Kong Professor in 1999, 2002, and 2011, respectively. His current research interests include hybrid organic-inorganic photonic functional materials and multifunctional porous materials
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Li, H., Zhang, L., He, H. et al. Tunable nonlinear optical responses based on host-guest MOF hybrid materials. Sci. China Mater. 64, 698–705 (2021). https://doi.org/10.1007/s40843-020-1455-6
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DOI: https://doi.org/10.1007/s40843-020-1455-6