Electrical control of Forster energy transfer
Electrical control of Forster energy transfer
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DOI：
10.1038/nmat1738
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发表时间：
2006-10-01
期刊：
影响因子：
41.2
通讯作者：
Feldmann, Jochen
中科院分区：
文献类型：
--
作者：
Becker, Klaus;Lupton, John M.;Feldmann, Jochen
将本质上不同功能的化合物（如无机纳米结构和有机分子）结合在一起，构成了一种特别强大的途径，可以创建具有协同特性的新型功能器件，这些特性在两种成分中都没有发现。我们介绍纳米光子功能元件结合两类材料，半导体纳米晶体（1）和染料，其物理性质出现作为一个叠加的属性的各个组件。强吸收的棒状纳米晶体（2）通过能量转移使弱吸收染料聚集而聚焦入射辐射。CdSe/CdS纳米棒在单粒子水平上表现出大的量子限制斯塔克效应（3），这使得能够直接控制单个纳米棒-染料对中纳米级福斯特型能量转移所需的供体和受体之间的光谱共振。通过这种近场现象的远场操纵，可以用电控制单个染料分子的发射。我们认为，这种效应可能会导致单分子光电开关的设计，为更复杂的纳米光子电路提供构建模块。
Bringing together compounds of intrinsically different functionality, such as inorganic nanostructures and organic molecules, constitutes a particularly powerful route to creating novel functional devices with synergetic properties found in neither of the constituents. We introduce nanophotonic functional elements combining two classes of materials, semiconductor nanocrystals(1) and dyes, whose physical nature arises as a superposition of the properties of the individual components. The strongly absorbing rod-like nanocrystals(2) focus the incident radiation by photopumping the weakly absorbing dye via energy transfer. The CdSe/CdS nanorods exhibit a large quantum-confined Stark effect(3) on the single-particle level, which enables direct control of the spectral resonance between donor and acceptor required for nanoscopic Forster-type energy transfer in single nanorod-dye couples. With this far-field manipulation of a near-field phenomenon, the emission from single dye molecules can be controlled electrically. We propose that this effect could lead to the design of single-molecule optoelectronic switches providing building blocks for more complex nanophotonic circuitry.