A Study of Mn2+ Doping in CdS Nanocrystals
A Study of Mn2+ Doping in CdS Nanocrystals
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DOI：
10.1021/cm0702767
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发表时间：
2007-06
影响因子：
8.6
通讯作者：
Angshuman Nag;S. Sapra;C. Nagamani;A. Sharma;N. Pradhan;S. Bhat;D. Sarma
中科院分区：
文献类型：
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作者：
Angshuman Nag;S. Sapra;C. Nagamani;A. Sharma;N. Pradhan;S. Bhat;D. Sarma
我们在这里报告的水溶性Mn2+掺杂的CdS纳米晶体的合成，其中它已成为可能的第一次，以获得一个独特的Mn2+ d相关的发射以及分离的缺陷态发射。通过系统地改变反应温度，我们确定55 °C为使Mn2+ d排放最大化的最佳温度，该最佳合成温度的存在被示出为温度的两个相反影响的结果。最有趣的是，目前的结果确定，Mn 2+有利于优先掺杂较大尺寸的颗粒，即使在本合成中实现的窄尺寸分布内，使得对于任何给定的合成，相对较小尺寸的纳米晶体耗尽Mn 2+。本方法的一个重要方面是合成的纳米晶体容易溶解在水中，而对Mn2+ d相关的发射强度没有任何有害影响。
We report here the synthesis of water soluble Mn2+-doped CdS nanocrystals in which it has been possible for the first time to obtain a distinct Mn2+ d-related emission well-separated from the defect state emissions. By varying the reaction temperature systematically, we establish 55 °C as the optimum temperature to maximize the Mn2+ d emission, the existence of this optimum synthesis temperature being shown as the result of two opposing influences of the temperature. Most interestingly, present results establish that Mn2+ favors preferential doping of larger-sized particles even within the narrow size distribution achieved in the present synthesis, rendering the relatively smaller-sized nanocrystals depleted of Mn2+ for any given synthesis. One important aspect of the present approach is that the synthesized nanocrystals readily dissolve in water without any deleterious effect on the Mn2+ d-related emission intensity.