Abstract The emission spectra of CdSe/ZnS core-shell type quantum dots were observed after the dilution of their toluene solution with organic solvents (acetone, diethyl ether, n-hexane, toluene, methanol, and ethanol). In addition to the well-known solvent dependence of the emission efficiency and peak wavelength, it was found that they change over several hours after the dilution, depending on the solvent and the number density of the quantum dot. Based on the solubility of the capping organic ligand to each solvent, the observed time variations were explained in terms of the elution of capping molecules from the dot surface and the resulting change of the number of charge traps.

中文翻译：

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有机溶剂稀释引起的 CdSe/ZnS 量子点发射光谱变化

摘要 用有机溶剂（丙酮、乙醚、正己烷、甲苯、甲醇和乙醇）稀释甲苯溶液后，观察了CdSe/ZnS核壳型量子点的发射光谱。除了众所周知的发射效率和峰值波长的溶剂依赖性之外，还发现它们在稀释后几个小时内发生变化，这取决于溶剂和量子点的数密度。基于封端有机配体对每种溶剂的溶解度，观察到的时间变化可以用封端分子从点表面的洗脱和由此产生的电荷陷阱数量的变化来解释。