Radial-Position-Controlled Doping in CdS/ZnS Core/Shell Nanocrystals

• Published in: Journal of the American Chemical Society Vol. 128; no. 38; pp. 12428 - 12429
• Main Authors: Yang, Yongan, Chen, Ou, Angerhofer, Alexander, Cao, Y. Charles
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 27.09.2006
• Subjects: Cadmium Compounds - chemistry; Chemistry; Exact sciences and technology; General and physical chemistry; Magnetics; Manganese - chemistry; Nanoparticles - chemistry; Sulfides - chemistry; Zinc Compounds - chemistry; Cadmium Sulfides; Zinc Sulfides; Nanocrystal
• ISSN: 0002-7863; 1520-5126
• DOI: 10.1021/ja064818h

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.