论文期刊

The effect of core size on the fluorescence emission properties of CdTe@CdS core@shell quantum dots




作者: Jian Zhu, Si-Nan Wang, Jian-Jun Li, Jun-Wu Zhao ⁎
发表/完成日期: 2018-03-21
期刊名称: Journal of Luminescence
期卷: 199 (2018)
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论文简介
In this work, the effect of core size on the fluorescence emission properties of CdTe@CdS core@shell quantum
dots was investigated under the condition of different shell thickness and pH values. Both CdTe and CdTe@CdS
core@shell QDs were synthesized in aqueous phase by a simple method, whose optical features were char-
acterized by absorption and fluorescence spectra. High resolution transmission electron microscopy (HRTEM)
and X-Ray Diffraction (XRD) were utilized to study the structure and composition of the as-prepared QDs. We
can conclude that a smaller initial core exhibits a greater potential for optimizing both fluorescence intensity
enhancement and red shift. What's more, there is an optimal shell thickness for the strongest fluorescence in-
tensity while a thicker shell contributes to a larger fluorescence red shift. The optimal pH value is 10.5 for the
fluorescence intensity enhancement of the core@shell QDs and a higher pH value is an advantage to expedite the
growth rate of CdS shell.