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Brightly luminescent (NH)CsPbBr quantum dots for in vitro imaging and efficient photothermal ablation therapy. | LitMetric
Herein, we report for the first time a facile strategy for the highly efficient (NH)CsPbBr quantum dots (QDs). By modulating the amount of ammonium, (NH)CsPbBr QDs with different photoluminescence (PL) quantum yields (QY) were synthesized. The results of X-ray diffraction and X-ray photoelectron spectroscopy showed that the crystal structure of (NH)CsPbBr was altered by incorporation of NH cations into the CsPbBr lattice. The (NH)CsPbBr QDs showed enhanced PL QY, higher photostability, and long-term storage stability compared to CsPbBr QDs. Furthermore, (NH)CsPbBr QDs could be conjugated with a photothermal dye (IR780) via a one-pot reaction using poly(styrene-co-maleic anhydride) and IR780-MPTS. To the best of our knowledge, the present work is the first attempt integrating perovskite QDs and phototherapeutic molecules into one system (abbreviated as PQD-IR780), demonstrating good water dispersibility and high photothermal conversion efficiency of 57.85%. In vitro experiments performed to examine subcellular uptake showed high fluorescence brightness was observed in HeLa, B16F1, and HepG2 cancer cells cultured with PQD-IR780. The results indicate that the internalization mechanism for uptaking of PQD-IR780 inside HeLa cells is energy-dependent and caveolin-mediated endocytosis. The in vitro cell viability assays and photothermal therapy revealed that PQD-IR780 showed good biocompatibility and can induce hyperthermia upon laser irradiation.
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