Toward 95.5% Efficient Red Emissive Carbon Dots: Oxidation State Enhancing Radiative Electron-Transition of Indole Fluorophore

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-10-18 DOI:10.1021/acs.nanolett.4c04367

Qing Zhang, Fengqing Wang, Junlan Liu, Ruoyu Wang, Yupengxue Ma, Fangfang Xia, Yuanyuan Qiu, Liangwei Zeng, Shaofeng Xu, Xiaoxia Zhong

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Abstract

Red fluorescence carbon dots (CDs) are promising for diverse applications and have attracted tremendous research interest. However, it is still challenging to achieve red fluorescence CDs with high fluorescence quantum yields (QYs > 50%). Herein, three kinds of red fluorescence CDs with QYs of 53.48, 85.21, and 59.18% are prepared. Benefiting from the oxidation induced by atmospheric-pressure O₂ plasma processing, 95.5% efficient red fluorescence emission is achieved. It is revealed that the indole based fluorophores act as the red-emitting photoluminescence center. The synergistic effect between the C–O–C structure and indole based fluorophores plays a key role in promoting the efficiency of radiative electron transition and controlling the red fluorescence QYs. Additionally, the CDs show promising prospects for in vivo bioimaging and low in vivo toxicity. This work shows a new way for achieving high-efficiency red fluorescence CDs, and it may guide the development of high-performance CDs for diverse applications.

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实现 95.5% 高效红色发光碳点：氧化态增强吲哚荧光团的辐射电子转变

红色荧光碳点（CD）具有多种应用前景，并已引起了巨大的研究兴趣。然而，实现高荧光量子产率（QYs >50%）的红色荧光碳点仍具有挑战性。本文制备了三种红色荧光光盘，其量子产率分别为 53.48%、85.21% 和 59.18%。得益于常压 O2 等离子体处理过程中的氧化作用，红色荧光发射效率达到 95.5%。研究表明，吲哚类荧光团是红色发光的光致发光中心。C-O-C 结构与吲哚类荧光团之间的协同效应在提高辐射电子转换效率和控制红色荧光 QYs 方面发挥了关键作用。此外，CD 在体内生物成像和低毒性方面显示出广阔的前景。这项研究为实现高效红色荧光 CD 指明了一条新的途径，并将为开发高性能 CD 的各种应用提供指导。

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

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.