Emission and Förster Resonance Energy Transfer Behaviors of Colloidal Quantum Dots in a Metal Nanohole

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL Plasmonics Pub Date : 2024-06-24 DOI:10.1007/s11468-024-02404-3

Shaobo Yang, Yueh-Chi Lee, Yu-Sheng Lin, Li-Ping Liang, Yang Kuo, Chih-Chung Yang

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Abstract

The reduction of the photoluminescence (PL) decay time of a colloidal quantum dot (QD) inserted into an Ag or Au surface nanohole and the efficiency enhancement of the Förster resonance energy transfer (FRET) from a green-emitting QD into a red-emitting QD are first experimentally demonstrated. Besides the factor of metal dissipation in the induced surface plasmon (SP) coupling process, the reduced PL decay time is attributed to the QD emission efficiency increase caused by the SP-coupling-involved nanoscale-cavity effect. Numerical simulation studies are undertaken to confirm the feasible enhancements of QD emission, FRET, and color conversion efficiencies. In particular, by artificially changing the dielectric constant of Ag based on the Drude model, the effects of cavity resonance and SP coupling in producing the enhanced radiated power peaks can be differentiated. Such a peak can be formed when both conditions of cavity resonance and SP resonance are satisfied. In the case of a weaker (stronger) SP resonance, the combined resonance can lead to a stronger and sharper (weaker and broader) radiated power peak. The results in this paper indicate that a nanoscale metal cavity can be used for enhancing the emission and color conversion efficiencies of inserted light emitters.

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金属纳米孔中胶体量子点的发射和佛斯特共振能量转移行为

实验首次证明了插入银或金表面纳米孔中的胶体量子点（QD）的光致发光（PL）衰减时间的缩短，以及从绿色发光 QD 到红色发光 QD 的佛斯特共振能量转移（FRET）效率的提高。除了诱导表面等离子体（SP）耦合过程中的金属耗散因素外，PL 衰减时间的缩短还归因于由 SP 耦合引起的纳米级空腔效应所导致的 QD 发射效率的提高。数值模拟研究证实了提高 QD 发射、FRET 和色彩转换效率的可行性。特别是，根据 Drude 模型，通过人为改变 Ag 的介电常数，可以区分空腔共振和 SP 耦合在产生增强辐射功率峰方面的影响。当同时满足空腔共振和 SP 共振条件时，就会形成这样的峰值。在 SP 共振较弱（较强）的情况下，组合共振可导致更强、更尖锐（更弱、更宽）的辐射功率峰。本文的研究结果表明，纳米级金属空腔可用于提高插入式光发射器的发射和色彩转换效率。

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

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.