Center for Advanced Solar Photophysics, C-PCS, Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
J Am Chem Soc. 2011 Feb 9;133(5):1176-9. doi: 10.1021/ja108261h. Epub 2011 Jan 5.
We report an efficient synthesis of copper indium sulfide nanocrystals with strong photoluminescence in the visible to near-infrared. This method can produce gram quantities of material with a chemical yield in excess of 90% with minimal solvent waste. The overgrowth of as-prepared nanocrystals with a few monolayers of CdS or ZnS increases the photoluminescence quantum efficiency to > 80%. On the basis of time-resolved spectroscopic studies of core/shell particles, we conclude that the emission is due to an optical transition that couples a quantized electron state to a localized hole state, which is most likely associated with an internal defect.
我们报告了一种高效的合成铜铟硫化纳米晶体的方法，该晶体具有强可见光至近红外光致发光性能。这种方法可以生产出超过 90%化学产率的克级数量的材料，同时产生的溶剂废物极少。用几单层的 CdS 或 ZnS 对预先制备的纳米晶体进行外延生长，可以将光致发光量子效率提高到 > 80%。基于对核/壳粒子的时间分辨光谱研究，我们得出结论，发射是由于一个光学跃迁，该跃迁将一个量子化的电子态与一个局域化的空穴态耦合，这很可能与一个内部缺陷有关。
