Large colloidal quantum dots of PbSe (first excitonic peak position >2 µm) are synthesized under different conditions of temperature, the concentration of precursors and their ratio, and concentration of oleic acid and diphenylphosphine. The dependence of the optical properties, grain size dispersity, and process yield on the processing conditions is systematically explored and discussed. The Ostwald ripening process and how it affects grain growth is demonstrated. Finally, the results for the dependence of the absorption wavelength on the grain diameter for large nanocrystals are compared to the relationships reported in the literature for smaller nanocrystals.

中文翻译：

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大 PbSe 胶体量子点的合成和表征

PbSe 的大胶体量子点（第一个激子峰位置 >2 µm）是在不同温度、前体浓度及其比例以及油酸和二苯基膦浓度的条件下合成的。系统地探索和讨论了光学特性、晶粒尺寸分散性和工艺产量对加工条件的依赖性。演示了 Ostwald 成熟过程及其如何影响谷物生长。最后，将大纳米晶体的吸收波长对粒径的依赖性的结果与文献中报道的较小纳米晶体的关系进行比较。