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We report the first doping of crystalline methylammonium lead bromide(MAPbBr$_3$) perovskite thin-films with CdSe/CdZnS core/shell quantum dots(QDs), using a soft-chemistry method that preserves their high quantum yieldand other remarkable fluorescence properties. Our approach produces MAPbBr$_3$films of 100 nm thickness doped at volume ratios between 0.025 and 5% withcolloidal CdSe/CdZnS QDs whose organic ligands are exchanged with halide ionsto allow for close contact between the QDs and the perovskite matrix. Ensemblephotoluminescence (PL) measurements demonstrate the retained emission of theQDs after incorporation into the MAPbBr$_3$ matrix. Ensemble photoluminescenceexcitation (PLE) spectra exhibit signatures of wavelength-dependent couplingbetween the CdSe/CdZnS QDs and the MAPbBr$_3$ matrix. Spatially-resolved PLexperiments reveal a strong correlation between the positions of QDs and anenhancement of the PL signal of the matrix. Fluorescence lifetime imaging(FLIM)of the doped films furthermore show that the emission lifetime ofMAPbBr$_3$ is slower in the vicinity of QDs, which, in combination with theincreased PL signal of the matrix, suggests that QDs can act as nucleationseeds that improve the crystallinity of MAPbBr$_3$, boosting its emissionquantum yield. Antibunching measurements provide clear evidence ofsingle-photon emission from individual QDs-in-perovskite. Finally, the analysisof blinking statistics indicates an improvement of the photostability ofindividual QDs in perovskite as compared to bare CdSe/CdZnS QDs. At high dopinglevels, this work opens the route to hybrid-based LEDs. Low-doping contentwould lead to hybrid single-photon sources embedded in field-effect devices toserve as an alternative to solid-state QDs and help building nanophotonicdevices with high-quantum-yield CdSe-based QDs.

Doping MAPbBr$_3$ hybrid perovskites with CdSe/CdZnS quantum dots: from emissive thin-films to hybrid single-photon sources