Electroabsorption spectra of PbSe nanocrystal quantum dots
Electroabsorption spectra of PbSe nanocrystal quantum dots
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DOI：
10.1063/1.3583450
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发表时间：
2011-04
影响因子：
4
通讯作者：
Xiaomin Liu;Toshifumi Iimori;R. Ohshima;T. Nakabayashi;N. Ohta
中科院分区：
文献类型：
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作者：
Xiaomin Liu;Toshifumi Iimori;R. Ohshima;T. Nakabayashi;N. Ohta
用电场调制光谱法研究了聚合物薄膜中PbSe双量子点（QDs）在1300-1600 nm（对应于4.0-7.0 nm的直径）区域的近红外吸收的量子限制斯塔克效应。量子点的电吸收光谱显示了电场诱导的激子态能量移动，导致吸收光谱的二阶导数所给出的光谱展宽。结果表明，随着量子点尺寸的增加，激发到第一激子态后电偶极矩的变化幅度增加。
The quantum-confined Stark effect of PbSe nanocrystal quantum dots (QDs) in a polymer film has been studied for the near-infrared absorption in the region of 1300–1600 nm (corresponding to diameters of 4.0–7.0 nm) by using electric field modulation spectroscopy. Electroabsorption spectra of QDs show the electric-field-induced energy shift in the exciton state, resulting in the spectral broadening given by the second derivative of the absorption spectra. It is shown that the magnitude of the change in electric dipole moment following excitation into the first exciton state increases with an increase in the size of QDs.