Stabilizing Dye-Sensitized Upconversion Hybrids by Cyclooctatetraene

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-09-18 DOI:10.1021/acs.nanolett.4c03391

Yuxi Liu, Lulu Ning, Yijun Luo, Yin Huang, Zemin He, Hao Ma, Yuzhen Zhao, Jianjian Zhang, Deming Liu, Libing Fu, Steven J. Langford, Philip A. Gale, Yuxia Luo, Guochen Bao

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Abstract

Lanthanide-doped upconversion nanoparticles (UCNPs) can convert low-energy near-infrared (NIR) light into high-energy visible light, making them valuable for broad applications. UCNPs often suffer from poor light-harvesting capabilities, which can be significantly improved by incorporating organic dye antennas. However, the dye-sensitized upconversion systems are prone to severe photobleaching in an ambient atmosphere. Here, we present a synergistic approach to mitigate photobleaching by introducing triplet state quencher cyclooctatetraene (COT). COT effectively suppresses the generation of singlet oxygen by quenching the triplet states of the dye and consumes the existing singlet oxygen through oxidant reactions. The inclusion of COT extends the half-life of IR806 by 4.7-times by preventing the oxidation of its poly(methylene) chains. Without significantly affecting emission intensity and dynamics, COT effectively stabilized dye-UCNPs, demonstrating a notable 3.9-fold increase in half-life under continuous laser irradiation. Our findings suggest a new strategy to enhance the photostability of near-infrared dyes and dye-sensitized upconversion nanohybrids.

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环辛四烯稳定染料敏化上转换杂化物

掺杂镧系元素的上转换纳米粒子（UCNPs）可将低能量的近红外（NIR）光转换为高能量的可见光，因此具有广泛的应用价值。UCNPs 通常存在光收集能力差的问题，而通过加入有机染料天线可以显著改善这一问题。然而，染料敏化上转换系统在环境气氛中容易出现严重的光漂白现象。在这里，我们提出了一种通过引入三重态淬灭剂环辛四烯（COT）来缓解光漂白的协同方法。COT 通过淬灭染料的三重态有效抑制单线态氧的生成，并通过氧化反应消耗现有的单线态氧。加入 COT 后，IR806 的半衰期延长了 4.7 倍，防止了其聚（亚甲基）链的氧化。在不明显影响发射强度和动力学的情况下，COT 有效地稳定了染料-UCNPs，在连续激光照射下，半衰期明显延长了 3.9 倍。我们的研究结果为提高近红外染料和染料敏化上转换纳米混合体的光稳定性提供了一种新策略。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.