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PbSe and PbSxSe1-x semiconductor nanocrystals (NCs) have attracted ever-growing interest for their both fundamental physics and potential applications in a great swath of fields such as opto-electronic devices and nonlinear optics.The current fabrication strategy for colloidal PbSe and PbSxSe1-x NCs however frequently involves acutely toxic reagents and tedious reaction procedures, and is plagued by products with poorly controlled size and morphology.