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This work mainly investigated the influences of some factors, such as, synthesis methods, precursor alternatives, and vacuum heat-treating process, etc, on the fluorescent characteristics of the semiconductor quantum dots synthesized by aqueous phase. The research results indicate that the fluorescent characteristic of water-solution sample prepared from Na_2SO_3 precursor was sensitive to water bath heating time, and specially, its photoluminescence spectrum shows the unique phenomenon of double excitation and emission peaks. Meanwhile, the fluorescent characteristic of water-solution sample prepared from NaBH_4 precursor is slightly influenced by water bath heating time, and the surface of CdSe quantum dots could be passivated by the excessive amount of NaBH_4 precursor, which results in the effective decrease of surface traps and great enhancement of quantum yield. Furthermore, the fluorescent emission peaks of samples could be sharpened by vacuum heat-treating process, with its spectral full width at half of maximum (FWHM) around 30-40 nm, so the emission peaks become redshift, of which the intensity greatly increases.
This work mainly investigated the influences of some factors, such as, synthesis methods, precursor alternatives, and vacuum heat-treating process, etc, on the fluorescent characteristics of the semiconductor quantum dots synthesized by aqueous phase. of water-solution sample prepared from Na 2 SO 3 precursor was sensitive to water bath heating time, and specially, its photoluminescence spectrum shows the unique phenomenon of double excitation and emission peaks. Meanwhile, the fluorescent characteristic of water-solution sample prepared from NaBH 4 precursor is slightly influenced by water bath heating time, and the surface of CdSe quantum dots could be passivated by the excessive amount of NaBH_4 precursor, which results in the effective decrease of surface traps and great enhancement of quantum yield. be sharpened by vacuum heat-treating process, with its spe ctral full width at half of maximum (FWHM) around 30-40 nm, so the emission peaks become redshift, of which the intensity greatly increases.