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首页> 外文期刊>Advanced Functional Materials >Highly Efficient Nonradiative Energy Transfer from Colloidal Semiconductor Quantum Dots to Wells for Sensitive Noncontact Temperature Probing
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Highly Efficient Nonradiative Energy Transfer from Colloidal Semiconductor Quantum Dots to Wells for Sensitive Noncontact Temperature Probing

机译：从胶体半导体量子点到阱的高效非辐射能量转移，用于敏感的非接触温度探测

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摘要

This study develops and shows highly efficient exciton-transferring hybrid semiconductor nanocrystal films of mixed dimensionality comprising quasi 0D and 2D colloids. Through a systematic study of time-resolved and steady-state photoluminescence spectroscopy as a function of the donor-to-acceptor molar concentration ratio and temperature, a high-efficiency nonradiative energy transfer (NRET) process from CdZnS/ZnS core/shell quantum dots (QDs) directed to atomically flat CdSe nanoplatelets (NPLs) in their solid-state thin films is uncovered. The exciton funneling in this system reaches transfer efficiency levels as high as 90% at room temperature. In addition, this study finds that with decreasing temperature exciton transfer efficiency is increased to a remarkable maximum level of approximate to 94%. The enhancement in the dipole-dipole coupling strength with decreasing temperature is well accounted by increasing photoluminescence quantum yield of the donor and growing spectral overlap between the donor and the acceptor. Furthermore, NRET efficiency exhibits a highly linear monotonic response with changing temperature. This makes the proposed QD-NPL composites appealing for noncontact sensitive temperature probing based on NRET efficiencies as a new metric. These findings indicate that combining colloidal nanocrystals of different dimensionality enables efficient means of temperature probing at an unprecedented sensitivity level at nanoscale through almost complete exciton transfer.
机译：这项研究开发并显示了包含准0D和2D胶体的混合尺寸的高效激子转移杂化半导体纳米晶体薄膜。通过对时间分辨和稳态光致发光光谱进行系统研究，该光谱是供体与受体摩尔浓度比和温度的函数，从CdZnS / ZnS核/壳量子点进行的高效非辐射能量转移（NRET）过程（QDs）指向其固态薄膜中的原子平坦的CdSe纳米片（NPL）。该系统中的激子漏斗在室温下达到高达90％的传输效率水平。此外，这项研究发现，随着温度的降低，激子的传递效率将提高到明显的最高水平，约为94％。偶极子-偶极耦合强度随温度降低而增强，可以通过增加施主的光致发光量子产率以及施主与受主之间不断增长的光谱重叠来很好地说明。此外，随着温度的变化，NRET效率表现出高度线性的单调响应。这使得基于NRET效率作为新指标的拟议QD-NPL复合材料吸引了非接触敏感温度探测。这些发现表明，结合不同尺寸的胶体纳米晶体可以通过几乎完全的激子转移，以前所未有的灵敏度水平在纳米级进行温度探测的有效手段。

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  • 来源
    《Advanced Functional Materials》 |2016年第17期|2891-2899|共9页
  • 作者

    Olutas Murat; Guzelturk Burak; Kelestemur Yusuf; Gungor Kivanc; Demir Hilmi Volkan;

  • 作者单位

    Bilkent Univ, Dept Elect & Elect Engn, Dept Phys, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey|Abant Izzet Baysal Univ, Dept Phys, TR-14280 Bolu, Turkey;

    Bilkent Univ, Dept Elect & Elect Engn, Dept Phys, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Elect & Elect Engn, Dept Phys, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Elect & Elect Engn, Dept Phys, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey;

    Bilkent Univ, Dept Elect & Elect Engn, Dept Phys, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey|Nanyang Technol Univ, Luminous Ctr Excellence Semicond Lighting & Disp, Sch Elect & Elect Engn, Sch Phys & Math Sci,Sch Mat Sci & Engn, Nanyang Ave, Singapore 639798, Singapore;

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