通过表面改性工程提高碳点的余辉性能

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-22 DOI:10.1016/j.jlumin.2025.121271

Yulong Zhu , Chao Li , Jinhao Zang , Guangsong Zheng , Yang Nan , Xiaofan Xia , Zhichao Zhu , Guoqin Cao , Junhua Hu , Jinyang Zhu

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引用次数: 0

摘要

碳点在余辉发射强度和水稳定性方面存在一定的局限性。本文提出了一种利用尿素和3-氨基丙基三乙基氧基硅烷对种子CDs进行连续修饰以增强和稳定CDs余辉发射的策略。与尿素修饰的CDs相比，uCDs@SiO2的余辉强度显著增强了25倍，在5 w光照下，余辉亮度从5.51 cd/m2增加到50.93 cd/m2。更重要的是，在200°C下煅烧后，uCDs@SiO2在水溶液中保留了大约76%的初始余辉发射强度，持续8小时。这种保留归因于致密的SiO2基质，减轻了与氧相关的表面缺陷，并限制了非辐射衰变途径。最后，利用这种强大的余辉，我们展示了断电后继续发光的延时发光二极管，以及基于选择性猝灭的信息加密方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Enhanced afterglow performance of carbon dots via surface modification engineering

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Enhanced afterglow performance of carbon dots via surface modification engineering

Carbon dots (CDs) exhibit certain limitations in terms of afterglow emission intensity and water stability. Here, we present a strategy to enhance and stabilize the afterglow emission of CDs by sequentially modifying seed CDs with urea and 3-aminopropyltriethoxysilane. Compared to urea-modified CDs, the afterglow intensity of uCDs@SiO₂ was significantly enhanced by 25-fold, with the afterglow brightness increasing from 5.51 to 50.93 cd/m² under 5-W illumination. More importantly, after calcination at 200 °C, uCDs@SiO₂ retain approximately 76 % of their initial afterglow emission intensity in water solution over an 8-h period. This retention is attributed to a dense SiO₂ matrix that mitigates oxygen-related surface defects and restricts non-radiative decay pathways. Finally, leveraging this robust afterglow, we demonstrate time-delay light-emitting diodes that continue to glow after power-off, as well as an information-encryption method based on selective quenching.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.