A Study of Mn2+ Doping in CdS Nanocrystals
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- 作者：Angshuman Nag ; Sameer Sapra ; C. Nagamani ; Ajay Sharma ; N. Pradhan ; S. V. Bhat ; D. D. Sarma
- 刊名：Chemistry of Materials
- 出版年：2007
- 出版时间：June 26, 2007
- 年：2007
- 卷：19
- 期：13
- 页码：3252 - 3259
- 全文大小：311K
- 年卷期：v.19,no.13(June 26, 2007)
- ISSN：1520-5002
文摘
We report here the synthesis of water soluble Mn2+-doped CdS nanocrystals in which it has beenpossible for the first time to obtain a distinct Mn2+ d-related emission well-separated from the defectstate emissions. By varying the reaction temperature systematically, we establish 55 
C as the optimumtemperature to maximize the Mn2+ d emission, the existence of this optimum synthesis temperature beingshown as the result of two opposing influences of the temperature. Most interestingly, present resultsestablish that Mn2+ favors preferential doping of larger-sized particles even within the narrow sizedistribution achieved in the present synthesis, rendering the relatively smaller-sized nanocrystals depletedof Mn2+ for any given synthesis. One important aspect of the present approach is that the synthesizednanocrystals readily dissolve in water without any deleterious effect on the Mn2+ d-related emissionintensity.
C as the optimumtemperature to maximize the Mn2+ d emission, the existence of this optimum synthesis temperature beingshown as the result of two opposing influences of the temperature. Most interestingly, present resultsestablish that Mn2+ favors preferential doping of larger-sized particles even within the narrow sizedistribution achieved in the present synthesis, rendering the relatively smaller-sized nanocrystals depletedof Mn2+ for any given synthesis. One important aspect of the present approach is that the synthesizednanocrystals readily dissolve in water without any deleterious effect on the Mn2+ d-related emissionintensity.