Sub-millielectronvolt Line Widths in Polarized Low-Temperature Photoluminescence of 2D PbS Nanoplatelets

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-11-22 DOI:10.1021/acs.nanolett.4c04402

Pengji Li, Leon Biesterfeld, Lars F. Klepzig, Jingzhong Yang, Huu Thoai Ngo, Ahmed Addad, Tom N. Rakow, Ruolin Guan, Eddy P. Rugeramigabo, Ivan Zaluzhnyy, Frank Schreiber, Louis Biadala, Jannika Lauth, Michael Zopf

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Abstract

Colloidal semiconductor nanocrystals are promising materials for classical and quantum light sources due to their efficient photoluminescence (PL) and versatile chemistry. While visible emitters are well-established, excellent (near-infrared) sources are still being pursued. We present the first comprehensive analysis of low-temperature PL from two-dimensional (2D) PbS nanoplatelets (NPLs). Ultrathin 2D PbS NPLs exhibit high crystallinity confirmed by scanning transmission electron microscopy, revealing Moiré patterns in overlapping NPLs. At 4 K, unique PL features are observed in single PbS NPLs, including narrow zero-phonon lines with line widths down to 0.6 meV and a linear degree of polarization up to 90%. Time-resolved measurements identify trions as the dominant emission source with a 2.3 ns decay time. Sub-meV spectral diffusion and no inherent blinking over minutes are observed, as well as discrete spectral jumps without memory effects. These findings advance the understanding and underscore the potential of colloidal PbS NPLs for optical and quantum technologies.

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二维 PbS 纳米板微粒偏振低温光致发光中的亚毫伏线宽

胶体半导体纳米晶体因其高效的光致发光（PL）和多功能的化学性质而成为经典光源和量子光源的理想材料。虽然可见光发射器已得到广泛应用，但卓越的（近红外）光源仍在探索之中。我们首次对二维（2D）PbS 纳米片（NPLs）的低温光致发光进行了全面分析。扫描透射电子显微镜证实，超薄二维 PbS NPLs 具有很高的结晶度，在重叠的 NPLs 中显示出 Moiré 图案。4 K 时，在单个 PbS NPLs 中观察到独特的聚光特性，包括线宽低至 0.6 meV 的窄零声子线和高达 90% 的线性极化度。时间分辨测量结果表明，三离子是衰减时间为 2.3 ns 的主要发射源。此外，还观察到了亚兆电子伏特的光谱扩散和数分钟内无固有闪烁，以及无记忆效应的离散光谱跃迁。这些发现加深了人们对胶体 PbS NPLs 的理解，并强调了其在光学和量子技术方面的潜力。

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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.