Utilizing the Lability of Lead Selenide to Produce Heterostructured Nanocrystals with Bright, Stable Infrared Emission

摘要: Infrared-emitting nanocrystal quantum dots (NQDs) have enormous potential as an enabling technology for applications ranging from tunable infrared lasers to biological labels. Notably, lead chalcogenide NQDs, especially PbSe provide efficient emission over a large spectral range in the infrared, but their application has been limited by instability yield and peak position on exposure ambient conditions. Conventional methods improving NQD stability applying shell of more stable, wider band gap semiconductor material are frustrated tendency NQDs toward Ostwald ripening at even moderate reaction temperatures. Here, we describe partial cation-exchange method which take advantage this lability controllably synthesize PbSe/CdSe core/shell NQDs. Critically, these stable against fading shifting. Further, can undergo additional growth produce PbSe/CdSe/ZnS core/shell/shell that represent...