Plasmon‐Enhanced Fluorescence of NIR‐Emitting CdxHg1‐xTe Quantum Dots by Ag Nanoprisms

IF 2.7 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Helena Decker, Nadia Metzkow, Vladimir Lesnyak
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引用次数: 0

Abstract

Near‐infrared (NIR)‐emitting colloidal semiconductor nanocrystals (NCs) draw a lot of attention due to various fields of their potential application, such as bio‐imaging, photovoltaics, photodetectors, light‐emitting diodes, and optical amplifiers for telecommunication. Since they typically suffer from the partial loss of their fluorescence in a solid state, strategies to increase their quantum yields are of outstanding importance. One of the means to improve it is their coupling with structures exhibiting localized surface plasmon resonance (LSPR). As demonstrated for the visible range of light, plasmon‐exciton interactions can enhance the photoluminescence (PL) of CdSe and CdTe NCs. In this work, the influence of the electromagnetic field of plasmonic silver NCs on the PL of CdxHg1–xTe NCs in the NIR region with a special emphasis on tuning the distance between these particle species is studied. In a series of samples prepared by a layer‐by‐layer deposition through polyelectrolytes, a 1.4‐fold PL enhancement at a distance of 9–11 nm between the two layers is observed, while at any other separation emission quenching is a dominating effect. These findings corroborate well with theoretical predictions of an emission increase at these specific distances and can be applied to other types of plasmonic and emitting materials.
银纳米棱镜对近红外发光 CdxHg1-xTe 量子点的等离子体增强荧光
近红外(NIR)发光胶体半导体纳米晶体(NCs)因其潜在应用领域广泛而备受关注,如生物成像、光伏、光电探测器、发光二极管和电信光放大器等。由于它们在固态下通常会损失部分荧光,因此提高其量子产率的策略就显得尤为重要。提高量子产率的方法之一是将它们与表现出局部表面等离子体共振(LSPR)的结构耦合。在可见光范围内,等离子-激子相互作用可以增强硒化镉和碲化镉 NCs 的光致发光(PL)。在这项工作中,研究了等离子体银 NC 的电磁场对 CdxHg1-xTe NC 在近红外区域的光致发光的影响,并特别强调了这些粒子之间距离的调整。在一系列通过聚电解质逐层沉积制备的样品中,观察到两层之间的距离为 9-11 nm 时,聚光增强了 1.4 倍,而在任何其他距离处,发射淬灭是主要效应。这些发现很好地证实了在这些特定距离上发射增加的理论预测,并可应用于其他类型的等离子体和发射材料。
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来源期刊
Particle & Particle Systems Characterization
Particle & Particle Systems Characterization 工程技术-材料科学:表征与测试
CiteScore
5.50
自引率
0.00%
发文量
114
审稿时长
3.0 months
期刊介绍: Particle & Particle Systems Characterization is an international, peer-reviewed, interdisciplinary journal focusing on all aspects of particle research. The journal joined the Advanced Materials family of journals in 2013. Particle has an impact factor of 4.194 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). Topics covered include the synthesis, characterization, and application of particles in a variety of systems and devices. Particle covers nanotubes, fullerenes, micelles and alloy clusters, organic and inorganic materials, polymers, quantum dots, 2D materials, proteins, and other molecular biological systems. Particle Systems include those in biomedicine, catalysis, energy-storage materials, environmental science, micro/nano-electromechanical systems, micro/nano-fluidics, molecular electronics, photonics, sensing, and others. Characterization methods include microscopy, spectroscopy, electrochemical, diffraction, magnetic, and scattering techniques.
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