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(a) Fluorescence spectra of CZnO-Dots and the control sample; (b) Fluorescence spectra excited at different wavelengths for CZnO-Dots; the inset of (b) shows the photographic image of CZnO-Dots under UV light in a UV chamber; (c) Fluorescence imaging of CZnO-Dots under the excitation of a 562 nm band-pass filter; and (d) photostability of CZnO-Dots excited continuously at 430 nm wavelength for 5 h.
