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Improving the Five-Photon Absorption from Core–Shell Perovskite Nanocrystals
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-08-17 , DOI: 10.1021/acs.jpclett.3c01809 Xuanyu Zhang 1 , Shuyu Xiao 2 , Zhihang Guo 2 , Baozhen Yuan 1 , Xiongbin Wang 1 , Samo Zhang 1 , Yueqing Shi 1 , Guichuan Xing 3 , Tingchao He 2 , Rui Chen 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-08-17 , DOI: 10.1021/acs.jpclett.3c01809 Xuanyu Zhang 1 , Shuyu Xiao 2 , Zhihang Guo 2 , Baozhen Yuan 1 , Xiongbin Wang 1 , Samo Zhang 1 , Yueqing Shi 1 , Guichuan Xing 3 , Tingchao He 2 , Rui Chen 1
Affiliation
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It is necessary to improve the action cross section (η × σn) of high-order multiphoton absorption (MPA) for fundamental research and practical applications. Herein, the core–shell FAPbBr3/CsPbBr3 nanocrystals (NCs) were constructed, and fluorescence induced by up to five-photon absorption was observed. The value of η × σ5 reaches 8.64 × 10–139 cm10 s4 photon–4 nm–3 at 2300 nm, which is nearly an order of magnitude bigger than that of the core-only NCs. It is found that the increased dielectric constant promotes modulation of MPA effects, addressing the electronic distortion in high-order nonlinear behaviors through the local field effect. Meanwhile, the quasi-type-II band alignment suppresses the biexciton Auger recombination, ensuring the stronger MPA induced fluorescence. In addition, the core–shell structure can not only reduce the defect density but also promote the nonradiative energy transfer though the antenna-like effect. This work provides a new avenue for the exploitation of high-performance multiphoton excited nanomaterials for future photonic integration.
中文翻译：
提高核壳钙钛矿纳米晶体的五光子吸收
为了基础研究和实际应用，有必要提高高阶多光子吸收（MPA）的作用截面（η × σ n ）。在此，构建了核壳FAPbBr 3 /CsPbBr 3纳米晶体（NC），并观察到由多达五光子吸收引起的荧光。η × σ 5的值在2300 nm处达到8.64 × 10 –139 cm 10 s 4 photon –4 nm –3，这比仅有核心的NC大了近一个数量级。研究发现介电常数的增加促进了 MPA 效应的调制，通过局部场效应解决高阶非线性行为中的电子畸变。同时，准II型能带排列抑制双激子俄歇重组，确保MPA诱导的荧光更强。此外，核壳结构不仅可以降低缺陷密度，还可以通过类天线效应促进非辐射能量传输。这项工作为未来光子集成开发高性能多光子激发纳米材料提供了新途径。
更新日期：2023-08-17
中文翻译：
提高核壳钙钛矿纳米晶体的五光子吸收
为了基础研究和实际应用，有必要提高高阶多光子吸收（MPA）的作用截面（η × σ n ）。在此，构建了核壳FAPbBr 3 /CsPbBr 3纳米晶体（NC），并观察到由多达五光子吸收引起的荧光。η × σ 5的值在2300 nm处达到8.64 × 10 –139 cm 10 s 4 photon –4 nm –3，这比仅有核心的NC大了近一个数量级。研究发现介电常数的增加促进了 MPA 效应的调制，通过局部场效应解决高阶非线性行为中的电子畸变。同时，准II型能带排列抑制双激子俄歇重组，确保MPA诱导的荧光更强。此外，核壳结构不仅可以降低缺陷密度，还可以通过类天线效应促进非辐射能量传输。这项工作为未来光子集成开发高性能多光子激发纳米材料提供了新途径。
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