Abstract:

Sequential growth of magic sized semiconductor nanoclusters(CdSe) was realized in noncoordination solvent 1-octadecene(ODE) with 1-dodecanethiol(DDT) as “nucleating agent”, dodecylamine(DDA) as “activating agent”, cadmium fatty acid salts and ODE-Se as precursors. The obtained CdSe nanoclusters were characterized by transmission electron microscopy(TEM), ultraviolet-visible absorption(UV-Vis abs) spectroscopy, photoluminescence excitation(PLE), photoluminescence(PL) spectroscopy and time-resolved fluorescence spectroscopy. CdSe nanoclusters possess excellent room temperature photoluminescence properties. The PL spectra, which can only be obtained at low temperature(5~200 K) previously, can be easily measured at room temperature. Most of the emission spectra were induced by the surface traps and located in the yellow color region. Parts of nanoclusters can exhibit white color emission, whose CIE coordinate is x=0.339 and y=0.340. They will provide alternative materials for white color devices.

Key words: semiconductor, magic sized nanoclusters； room temperature fluorescence； white color