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Highly Luminescent CdSe/ZnS Nanocrystals Synthesized Using a Single‐Molecular ZnS Source in a Microfluidic Reactor

An air‐stable, low‐toxicity, single‐molecular source for ZnS is demonstrated to be an appropriate reagent to synthesize highly luminescent ZnS‐capped CdSe with a narrow size distribution. A photoluminescence quantum yield of above 50 % and a photoluminescence peak full width at half maximum of around 32 nm could be obtained after synthesis using a microreactor. The surface of the ZnS‐capped CdSe nanocrystals can be hydrophilic, while retaining the high quantum yield. Microscopic observation shows that accurate time control, which could be achieved by using a microreactor, is important to avoid the formation of many isolated ZnS particles and the deterioration of the luminescence.