Nag Angshuman, Sapra Sameer, Chakraborty S, Basu S, Sarma D D
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
J Nanosci Nanotechnol. 2007 Jun;7(6):1965-8. doi: 10.1166/jnn.2007.749.
Colloidal synthesis of high quality CdSe nanocrystals with controllable size and tunable properties have been one of the most important topics of research over the last decade, in view of its huge technological potentials. CdSe is one of the most studied nanocrystals of this category because of its photoluminescence tunability across the visible spectrum. We have synthesized CdSe nanocrystals using CdO precursor in a noncoordinating solvent and studied the effect of the reaction temperature on the size and optical properties of the nanocrystals. The size of the nanocrystals could be varied systematically in the range of 3.5 to 6.6 nm diameter with a remarkably narrow size distribution by controlling only the reaction temperature, without any need for a post-synthesis processing. The band gap and the corresponding band edge emission could be tuned across the entire visible range by tuning the size of the nanocrystals. The narrow width of the photoluminescence emissions of different colours (blue to red) make these nanocrystals a potential candidate for different optical and optoelectronic devices.
鉴于其巨大的技术潜力，高质量、尺寸可控且性质可调的CdSe纳米晶体的胶体合成一直是过去十年中最重要的研究课题之一。由于其在可见光谱范围内的光致发光可调性，CdSe是此类研究最多的纳米晶体之一。我们使用CdO前驱体在非配位溶剂中合成了CdSe纳米晶体，并研究了反应温度对纳米晶体尺寸和光学性质的影响。仅通过控制反应温度，纳米晶体的尺寸就能在直径3.5至6.6 nm的范围内系统地变化，且尺寸分布非常窄，无需任何合成后处理。通过调整纳米晶体的尺寸，能在整个可见范围内调节带隙和相应的带边发射。不同颜色（从蓝色到红色）的光致发光发射窄宽度使这些纳米晶体成为不同光学和光电器件的潜在候选材料。
