Broadband Upconversion Fluorescence Imaging in Mixed-Halide Perovskite Nanoplates through Direct Femtosecond Laser Writing

IF 3.8

ACS Applied Optical Materials Pub Date : 2025-08-04 DOI:10.1021/acsaom.5c00230

Junlin Lu, Chunhua Zhou, Guiyuan Cao, Zhixing Gan, Joel van Embden, Baohua Jia* and Xiaoming Wen*,

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Abstract

Efficient single-photon upconversion is observed in halide perovskites without rare metal doping. Using advanced femtosecond direct laser writing (fs-DLW), an upconversion fluorescence image is obtained spanning a broadband (green-to-red) wavelength region in mixed-halide perovskite FAPb(Br_xI_1–x)₃ nanoplatelets. After fs-DLW fabrication, a I–Br mixture component is formed within the mixed-halide perovskite nanoplatelets. The corresponding diversified band gap culminates in a broadband photoluminescence emission. Confocal microscopy images show that the upconversion signal is spatially distributed on the nanoplates. In addition, it is confirmed that the upconversion signal has a low excitation threshold. Efficient single-photon upconversion is observed, which we hypothesize is due to effective upconversion through a “lattice energy reservoir”. These findings are highly beneficial for further highly sensitive near-infrared photodetection and solar energy harvesting.

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直接飞秒激光写入混合卤化物钙钛矿纳米片的宽带上转换荧光成像

在未掺杂稀有金属的卤化物钙钛矿中观察到有效的单光子上转换。利用先进的飞秒直接激光写入（fs-DLW）技术，在混合卤化物钙钛矿FAPb(BrxI1-x)3纳米薄片中获得了宽带（绿到红）波长区域的上转换荧光图像。fs-DLW制备后，在混合卤化物钙钛矿纳米片内形成了I-Br混合组分。相应的多样化带隙在宽带光致发光发射中达到高潮。共聚焦显微镜图像显示，上转换信号在纳米片上呈空间分布。此外，还证实了上变频信号具有较低的激励阈值。观察到有效的单光子上转换，我们假设这是由于有效的上转换通过“晶格能量库”。这些发现对未来的高灵敏度近红外探测和太阳能收集具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Optical Materials 材料科学-光学材料-

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： ACS Applied Optical Materials is an international and interdisciplinary forum to publish original experimental and theoretical including simulation and modeling research in optical materials complementing the ACS Applied Materials portfolio. With a focus on innovative applications ACS Applied Optical Materials also complements and expands the scope of existing ACS publications that focus on fundamental aspects of the interaction between light and matter in materials science including ACS Photonics Macromolecules Journal of Physical Chemistry C ACS Nano and Nano Letters.The scope of ACS Applied Optical Materials includes high quality research of an applied nature that integrates knowledge in materials science chemistry physics optical science and engineering.