Abstract
A facile dual-passivation strategy based on S2− treatment and binary ligand exchange was developed, which can efficiently boost the photoluminescent quantum yield of as-synthesized CdSe nanocrystals (nanorods or quantum dots) under ambient conditions.
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Highly luminescent colloidal nanocrystals have wide applications in bioimaging and various optoelectronic devices. Herein we report a facile and mild procedure by combining S2− treatment and binary ligand passivation, which can efficiently enhance the luminescent property of CdSe nanocrystals at room temperature. The photoluminescence quantum yield of as-treated CdSe nanocrystals exhibits drastic enhancement (e.g., 188 times for CdSe nanorods) after this dual-passivation treatment. The methodology proposed here can be applied to various CdSe nanocrystals, regardless of their sizes, shapes, and crystal structures.