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Characterization of spectroscopic properties of NDs: (a) absorption spectra of NDs; (b) Fluorescence spectra of 100 ND at excitations of 532 nm and 488 nm; (c) time decay of 100 ND fluorescence measured at two-photon femtosecond excitation (with a pulse laser at 800 nm); inset-FLIM of 100 ND particles positioned on an Si substrate.
