Size Controlled Synthesis of Blue Emitting Core/Shell Nanocrystals via Microreaction

作者：Wan, Zhen; Luan, Weiling^*; Tu, Shan-tung

来源：Journal of Physical Chemistry C, 2011, 115(5): 1569-1575.

DOI：10.1021/jp108901z

• FLUORESCENT BIOLOGICAL LABELS
• CORE-SHELL NANOCRYSTALS
• ONE-POT SYNTHESIS
• SEMICONDUCTOR NANOCRYSTALS
• QUANTUM DOTS
• CDSE NANOCRYSTALS
• SOLAR-CELLS
• ELECTROLUMINESCENCE
• LUMINESCENCE
• PRECURSOR

Quantum dots emitted from 450 to 480 run are considered as promising materials for the fabrication of blue and white light-emitting diodes, where core/shell structured CdS/ZnS nano crystals (NCs) are among the ideal candidates. In this work, highly luminescent blue emission CdS/ZnS NCs were first synthesized in an accelerated fashion via capillary micro-reactor. The addition of oleylamine in the source solution was demonstrated as an efficient way to realize the size controlled synthesis of bare CdS NCs, while the application of zinc diethyldithiocarbamate as a single molecular precursor of shell material displayed a facile method to overcoat the bare CdS NCs and enhance the quantum efficiency. With the control of grain size and the optimization of capping reaction parameters, CdS/ZnS NCs emitted from 424 to 483 nm with a quantum yield as high as 80% were obtained, while maintaining narrow full width at half-maximum of photoluminescence from 21 to 24 nm. Furthermore, the continuous ultraviolet irradiation observation proved the excellent photochemical stability of CdS/ZnS NCs.

• 出版日期2011-2-10
• 单位华东理工大学