Preparation and formation mechanism of strong violet luminescent CdS quantum dots by using a ligand exchange strategy
A simple and general method has been proposed for preparing strong violet emitting CdS quantum dots, in which a ligand exchange strategy was applied to surface passivation and functionalization with good reproducibility. The resulting quantum dots showed a visible violet luminescence with emission peak centered near 423 nm and photoluminescence quantum yields reached over 30%. Additionally, different mercapto-compounds used as ligands can make different functionalized surfaces, favoring quantum dots dispersion in different media and their further applications. It was observed that the band edge emission has the main contribution to the bright violet luminescence.
Keywordsviolet quantum dots CdS ligand exchange band edge emission trap emission luminescence
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The authors are grateful for the financial support from National Natural Science Foundation of China (Contract No.20575002).
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