Heteroatom Doping Effects on the Exciton Behavior in Carbonized Polymer Dots

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-03-03 DOI:10.1021/acs.nanolett.5c00045

Zhihong Wei, Xin Yang, Chengshuang Liao, Feishi Shan, Shengnan Feng, Siyang Ye, Xinlan Hou, Leyong Wang, Xiaoyong Wang, Zhouyu Wang, Siyu Lu, Yuxi Tian

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Abstract

Carbonized polymer dots (CPDs) are attractive optoelectronic materials for a variety of applications, but their complex structures hinder a full understanding of their photophysical and excited-state properties. This work illustrates that heteroatom doping (N-doped, N,S-doped, and N,S,F-doped CPDs) significantly affects the exciton behavior of CPDs. It reveals unconventional photoluminescence (PL) blinking with multilevel intensity fluctuations, which depend on the doping type and excitation power density. The multilevel PL blinking is attributed to the formation of charged excitons induced by heteroatom doping, which resembles the characteristic behavior of semiconductor quantum dots. Additionally, nonradiative recombination enhances photothermal conversion efficiency, enabling effective photothermal therapy with significant cytotoxicity against cancer cells. Our results provide compelling evidence that CPDs possess quantum properties similar to those of semiconductors instead of emissive chromophores on the surface, while also highlighting their multifunctionality as photoluminescent probes and photothermal agents.

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杂原子掺杂对碳化聚合物点中激子行为的影响

碳化聚合物点（CPDs）是一种具有广泛应用前景的光电子材料，但其复杂的结构阻碍了人们对其光物理和激发态特性的充分理解。本研究表明，杂原子掺杂（N掺杂、N、S掺杂和N、S、f掺杂）显著影响了cpd的激子行为。研究结果表明，掺杂类型和激发功率密度的不同会导致非常规光致发光的多能级闪烁。多能级PL闪烁是由杂原子掺杂诱导带电激子的形成引起的，这与半导体量子点的特征行为相似。此外，非辐射重组提高了光热转换效率，使光热治疗对癌细胞具有显著的细胞毒性。我们的研究结果提供了令人信服的证据，表明cpd具有类似于半导体的量子特性，而不是表面上的发光发色团，同时也突出了它们作为光致发光探针和光热剂的多功能性。

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.