期刊
NANOSCALE
卷 7, 期 44, 页码 18570-18578出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr04856g
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资金
- 973 Program of China [2014CB643503]
- NSFC [51425303, 21374042, 21174051, 21221063]
- Natural Science Foundation of Jilin Province [20140101048JC]
- MOST of China
- Fundamental Research Funds for Central Universities
As promising heavy metal-free emitting materials, Ag-In-Se nanocrystals (NCs) are conventionally synthesized using organic phosphine agents and exhibit near-infrared emissions. In this work, we demonstrate a rapid phosphine-free approach for synthesizing Ag-In-Se alloy NCs with the emissions tunable to the visible region on the basis of the phosphine-free dissolution of Se powder. At room temperature, Se powder is reduced by dodecanethiol and dissolved in oleylamine to produce a Se precursor. The resultant Se precursor is highly active, which permits rapid synthesis at a relatively low temperature, such as at 90 degrees C for 150 s. By optimizing the size, structure, and composition, the photoluminescence quantum yield of the as-synthesized Ag-In-Se NCs is enhanced to up to 10%. The growth of the Ag-In-Se NCs involves composition and phase transition, which strongly depend on the reaction temperature. The Ag2Se nuclei form first, and the Ag-In-Se NCs are produced by doping In3+ into the preformed Ag2Se nuclei. Tetragonal phase Ag-In-Se is obtained below 170 degrees C, while the orthorhombic phase appears over 190 degrees C. The potential of Ag-In-Se NCs as red emitting phosphors for lighting-emitting diodes is further demonstrated.
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