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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Energy Transport in CdSe Nanocrystals Assembled with Molecular Wires
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Energy Transport in CdSe Nanocrystals Assembled with Molecular Wires

机译：分子线组装的CdSe纳米晶体中的能量传输

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摘要

Continuous-wave photoluminescence studies on CdSe nanocrystals assembled with oligo-p-(phenyleneethynylene)_n-dibenzylthiols (n = 0,1,3) indicate long-range resonant energy transfer can be tuned by size-dependent control of the weak electromagnetic dipole-dipole coupling of the donor (molecular wire) and the acceptor (nanocrystal). These micron-scale free-standing inorganic-organic composite structures are composed of CdSe in the strongly confined regime with diameters between 2.8 nm to 8.0 nm assembled with rigid molecular wire lengths of 1.3 nm, 1.9 nm, and 3.1 nm. Evidence is presented which supports the possibility that interchain interactions of molecular wires within the assembly form two additional species that participate in the energy transfer process, dimers and aggregate excitons. Dimer states act as intermediate states for the migrating molecular exciton, and are selectively quenched by quantized CdSe electronic transitions (1S_(3/2)-1S_e, 1P_(3/2)-1P_e), while aggregate excitons act as emissive excitation traps.
机译：对低聚对-（亚苯基乙炔基）_n-二苄硫醇（n = 0,1,3）组装的CdSe纳米晶体的连续波光致发光研究表明，可以通过弱电磁偶极子的尺寸依赖性控制来调节远距离共振能量转移。供体（分子线）和受体（纳米晶体）的偶极耦合。这些微米级的自立式无机-有机复合结构由CdSe严格约束，直径为2.8 nm至8.0 nm，并装配有1.3 nm，1.9 nm和3.1 nm的刚性分子线。提出的证据支持组件中分子丝的链间相互作用形成另外两个参与能量转移过程的物质：二聚体和聚集激子。二聚体态充当迁移分子激子的中间态，并通过量化的CdSe电子跃迁（1S_（3/2）-1S_e，1P_（3/2）-1P_e选择性淬灭，而聚集激子充当发射激发陷阱。

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