Influence of dilution with organic solvents on emission spectra of CdSe/ZnS quantum dots
Influence of dilution with organic solvents on emission spectra of CdSe/ZnS quantum dots
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有机溶剂稀释对CdSe/ZnS量子点发射光谱的影响
DOI：
10.1117/12.2269436
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and Takeshi Moriyasu
中科院分区：
文献类型：
--
作者：
Mitsutaka Kumakura;Asuka Kinan;and Takeshi Moriyasu
用有机溶剂（甲苯、正己烷、乙醚、丙酮、乙醇和甲醇）稀释CdSe/ZnS核壳量子点的甲苯溶液后，监测其发射光谱。除了众所周知的根据溶剂的发射效率的差异之外，我们发现它们的时间变化取决于溶剂。从基于封端有机配体十六胺（HDA）对每种溶剂的溶解度的讨论中，建议所观察到的时间变化是由封端分子从量子点表面的液化以及由此产生的量子点中电荷的陷阱位点的数目的变化引起的。
The emission spectra of CdSe/ZnS core-shell dots have been monitored after the dilution of their toluene solution with organic solvents (toluene, n-hexane, diethyl ether, acetone, ethanol, and methanol). In addition to the well-known difference of the emission efficiency according to the solvent, we found their time variation depending on the solvent. From the discussion based on the solubility of the capping organic ligand, hexadecylamine (HDA), to each solvent it is suggested that the observed time variation is caused by the liquation of the capping molecules form the dot surface and the resulting change of the number of the trap site for charges in the quantum dot.