魔幻尺寸CdSe纳米簇的连续生长与室温光学性质

Magic Sized CdSe Nanoclusters:Sequential Growth and Room Temperature Optical Properties

以镉的脂肪酸盐和分散在三辛基膦中的硒单质分别作为镉和硒的前体,采用十二烷基硫醇做＂成核剂＂,十二烷基胺为活化剂,在非配位溶剂十八碳烯中,实现了连续尺寸高质量魔幻尺寸半导体纳米簇（CdSe）的合成。所得CdSe纳米簇的形态和光学性质分别通过透射电子显微镜、紫外可见吸收光谱、荧光激发光谱、荧光发射光谱及时间分辨的荧光光谱测试技术进行了表征和测定。该系列CdSe纳米簇具有良好的室温荧光性质,能够得到较强的以往只有低温（5~200K）下才能探测到的荧光光谱。所得发射光谱大部分为表面缺陷导致的黄光发射。部分尺寸的纳米簇能够实现白光发射,其CIE坐标为（0.339,0.340）,为白光光源的开发提供了备选材料。

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（UVVis 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.