We report a reversible three-state and dual color photoluminescence (PL) intensity modulation of quantum dots (QDs) by electrochemically applying voltages on the Prussian blue (PB) substrate. PB acts as the electro-switchable materials because the applied voltage controls the oxidation state of iron ions in PB. Depending on the oxidation states of iron ions and their redox potential, the charge transfer from QDs to PB can be allowed or blocked, acting as a main mechanism of PL intensity modulation of QDs in multistate. Engineering heterostructures of QDs give rise to additional controllability of PL intensity modulation. The CdS shell on top of CdSe core QDs acts as a hole blocking layer, whereas the ZnSe shell acts as an electron blocking layer. With the combination of the applied voltage and its core/shell heterostructure, we could selectively quench or recover PL intensity of two different QDs which gives dual color tunability.
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