期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 7, 页码 3005-3010出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp111288h
关键词
-
资金
- NSFC of China [20873039, 51002009]
High-quality Mn:ZnSe/ZnS core/shell and Mn:ZnSeS shell-alloyed doped nanocrystals (d-dots) with up to 50% photoluminescence (PL) quantum yield (QY) have been synthesized based on nucleation-doping strategy through a phosphine-free approach. The formation of MnSe nanoclusters was achieved by adjusting the ratio of stearic acid to manganese stearate and using a highly reactive Se precursor. Mn: ZnSe/ZnS core/shell d-dots were prepared by an epitaxial ZnS growth on the Mn:ZnSe core. The PL QY of Mn:ZnSe/ZnS core/shell d-dots decreased dramatically after injections of S precursor but was completely recovered through an UV irradiation. After annealing at 240 degrees C for 30 min, the core/shell Mn:ZnSe/ZnS d-dots evolved to the Mn:ZnSeS shell-alloyed d-dots with high PL QY. The PL peak position of the d-dots could be tuned within a relatively large optical window, from 584 to 605 nm.
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