A study of Mn 2+ doping in CdS nanocrystals

Angshuman Nag, Sameer Sapra, C. Nagamani, Ajay Sharma, N. Pradhan, S. V. Bhat, D. D. Sarma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

145 Scopus citations

Abstract

We report here the synthesis of water soluble Mn 2+-doped CdS nanocrystals in which it has been possible for the first time to obtain a distinct Mn 2+ 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 Mn 2+ 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 Mn 2+ 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 Mn 2+ 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 Mn 2+ d-related emission intensity.

Original languageEnglish (US)
Pages (from-to)3252-3259
Number of pages8
JournalChemistry of Materials
Volume19
Issue number13
DOIs
StatePublished - Jun 26 2007

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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