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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Spatial Organization of GaSe Quantum Dots: Organic/Semiconductor Liquid Crystals
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Spatial Organization of GaSe Quantum Dots: Organic/Semiconductor Liquid Crystals

机译：GaSe量子点的空间组织：有机/半导体液晶

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摘要

Mixed liquid crystals consisting of the smectic-A phase of 8CB and 8 nm GaSe nanoparticles have been formed and studied using static and time-resolved optical polarization spectroscopy. The mixtures consist mostly of 8CB, with a small volume fraction of the nanoparticles. Polarized absorption spectra indicate that the nanoparticles are highly aligned in the liquid crystal environment. The absorption and fluorescence spectra suggest that GaSe nanoparticles in 8CB form aggregates having two distinct types of domains. Most of the nanoparticles are in domains in which there are weak interactions between adjacent nanoparticles. A small fraction are in strongly coupled domains in which adjacent nanoparticles have about 1600 cm~(-1) interaction energies. Because of facile energy transfer, the fluorescence spectrum is dominated by the strongly coupled domains. Energy transfer from the weakly to the strongly interacting domains occurs within about 30 ps. Subsequent relaxation within the strongly interacting domains occurs on the 3 ns time scale.
机译：已经形成了由8CB的近晶A相和8 nm GaSe纳米粒子组成的混合液晶，并使用静态和时间分辨光学偏振光谱法进行了研究。混合物主要由8CB组成，其中纳米颗粒的体积分数很小。偏振吸收光谱表明，纳米颗粒在液晶环境中高度对齐。吸收光谱和荧光光谱表明，8CB中的GaSe纳米颗粒形成具有两种不同类型结构域的聚集体。大多数纳米颗粒都在相邻纳米颗粒之间相互作用弱的区域中。一小部分在强耦合域中，其中相邻的纳米粒子具有约1600 cm〜（-1）的相互作用能。由于容易的能量转移，荧光光谱由强耦合域主导。从弱相互作用域到强相互作用域的能量转移发生在约30 ps之内。随后，强相互作用域内的弛豫发生在3 ns的时间尺度上。

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