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在氩气保护下,用三辛基亚磷酸和油酸分别作为Se和Cd的配位体,在260~300℃的十八烯溶液中合成了尺寸可控的CdSe纳米晶。该纳米晶不用进行进一步的提纯和尺寸分离就具有单分散性,其量子尺寸限域效应非常明显———吸收光谱的第一吸收峰峰位随着纳米晶的长大而发生红移;该纳米晶质量很高,具有很强的发光能力,其发射光谱对称的形状和合理的Stokes频移(13 nm)显示,该纳米晶的发光完全出自带隙,没有来自缺陷的发光。此外,实验结果表明,通过改变三辛基亚磷酸的浓度可以调节成核和生长的快慢,从而可以在不同的反应时间得到不同尺寸的单分散性CdSe纳米晶。
Under the protection of argon, trioctylphosphoric acid and oleic acid were used as the ligands of Se and Cd respectively, and CdSe nanocrystals with controlled size were synthesized in the octadecene solution at 260 ~ 300 ℃. The nanocrystals have monodispersity without further purification and size separation, and their quantum size confinement effect is very obvious --- the first absorption peak of the absorption spectrum shifts red-shifted with the growth of nanocrystals; The nanocrystal is of high quality with strong luminescence ability. The symmetrical shape of the emission spectrum and reasonable Stokes shift (13 nm) show that the luminescence of the nanocrystal is completely from the bandgap without luminescence from the defect. In addition, the experimental results show that by changing the concentration of trioctylphosphine, the nucleation and growth rate can be adjusted so that different sizes of monodisperse CdSe nanocrystals can be obtained at different reaction times.