Energy Transfer between Perovskites and CdSe/ZnS Core-shell Quantum Dots

초록

The luminescence properties of surface-passivated methylammonium lead halide perovskites (PS) combined with CdSe/ZnS core-shell quantum dots (QDs) were investigated using photoluminescence (PL) and time-resolved PL (TRPL) spectroscopies. We synthesized two different PS films covered with QDs, namely QD/CH3NH3PbI3 and QD/CH3NH3PbBr3. Both the PL intensity and decay time were higher for the QD/CH3NH3PbI3 hybrid structure than those of the bare CH3NH3PbI3 film, which was attributed to an energy transfer (ET) process from the CdSe/ZnS QDs to CH3NH3PbI3. In contrast, for the QD/CH3NH3PbBr3 hybrid structure, the reduced PL intensity and decay time compared to those of the bare CH3NH3PbBr3 film were attributed to ET from CH3NH3PbBr3 to the QDs. These PL and TRPL results demonstrated that the optical properties of PS films can be improved by the addition of QD coatings, which could enable the application of such materials as support layers for adjacent active layers in optoelectronic devices.

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