Synthesis of Highly Emissive Mn-Doped ZnSe Nanocrystals without Pyrophoric Reagents
by Zeng, R. S.; Rutherford, M.; Xie, R. G.; Zou, B. S.; Peng, X. G.
Manganese-doped zinc selenide quantum dots (Mn:ZnSe d-dots) with high optical quality, pure dopant emission with 40-60% photoluminescence quantum yield, were synthhesized with air-stable and generic starting materials, namely zinc (manganese) fatty acids salts with corresponding free fatty acids, Se powder, fatty amine, and octadecene. The prophoric, highly toxic, and expensive organo-phospines were eliminated from the existing synthetic protocols for high quality Mn:SnSe d-dots, which changed the reaction profile substantially mainly because of the enhanced reacitivity of elemental Se with presence of fatty amines. The reaction temperatures for two key processes involved in "nucleation-doping", namely, formation of MnSe nanoclusters and their overcoating by the host, were both reduced. Multiple injection techniques were employed to realize balanced diffusion of the Mn ions in the d-dots. The resulting d-dots were found to be in zinc--blende crystals structure, with optimal spherical shape, nearly monodispersed, and controlled in their Mn-Zn ratio
- Journal
- Chemistry of Materials
- Volume
- 22
- Issue
- 6
- Year
- 2010
- Start Page
- 2107-2113
- URL
- https://dx.doi.org/10.1021/cm9036023
- ISBN/ISSN
- 1520-5002; 0897-4756
- DOI
- 10.1021/cm9036023