Radial-position-controlled doping in CdS/ZnS core/shell nanocrystals.
In this paper, we report a new doping approach using a three-step synthesis to make high-quality Mn-doped CdS/ZnS core/shell nanocrystals. This approach allows precise control of the Mn radial position and doping level in the core/shell nanocrystals. On the basis of this synthetic advance, we have demonstrated the first example in which optical properties of Mn-doped nanocrystals strongly depend on Mn radial positions inside the nanocrystals. In addition, we have synthesized nanocrystals with a room-temperature Mn-emission quantum yield of 56%, which is nearly twice as high as that of the best Mn-doped nanocrystals reported previously. Nanocrystals with such a high-emission quantum yield are very important to applications such as nanocrystal-based biomedical diagnosis.
Yang
Yongan
Y
Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA.
Chen
Ou
O
Angerhofer
Alexander
A
Cao
Y Charles
YC
D019187:Cadmium Compounds / Q000737:chemistry*; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
D019187:Cadmium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C034939:cadmium sulfide; D008345:Manganese; C031238:zinc sulfide