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(a) RL emission spectrum and (b) RL imaging of TbBDC-PEG, EuBDC-PEG, and EuxTbxBDC-PEG nMOF concentrations (mg/mL) in H2O. (c) In vitro RLI of CT26 cell pellets under X-ray excitation of (i) blank cells and cells incubated with (ii) EuBDC-PEG, (iii) TbBDC-PEG, and (iv) EuxTbxBDC-PEG nMOFs for 24 h. Adapted with permission.[17] Copyright 2020, American Chemical Society.
