Strong Coupling between Mn2+ Dopants and CdSe Nanoplatelets Enables Charge-Transfer Transition and Dual Emission

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-03-28 DOI:10.1021/acs.nanolett.5c01269

Lifeng Wang, Junhui Wang, Jinglu Sun, Yongshun Lv, Tao Ding, Pengfei Cheng, Kaifeng Wu

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引用次数: 0

Abstract

Doping transitional metals into colloidal nanocrystals can significantly modify their excited-state dynamics and enrich their optical and magneto-optical functionalities. Here we synthesize Mn-doped CdSe nanoplatelets and investigate their excited-state dynamics and light-emission mechanisms. Extensive characterizations suggest that Mn²⁺ ions are situated near the surface-region of the nanoplatelets. The atomic thinness of nanoplatelets allows for a strong host-dopant coupling, manifested as broadband charge-transfer absorption and emission (near 575 nm) between the host valence band and the dopant d-orbitals. Photoexcitation of the host leads to rapid (a few ps) electron transfer from the conduction band to the d-orbitals, and the resultant charge-transfer state decays within a few ns not only through charge-transfer emission but also generating an excited-state species (likely Mn-Mn dimer) with a characteristic near-infrared emission. These novel photophysics and photochemistry uncovered for quasi-two-dimensional Mn-doped nanocrystals form the basis for optical, magneto-optical, and energy conversion applications using such materials.

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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.