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Optical characteristics. (A) UV-Vis absorption spectra. (B) CuNCs photoluminescence spectra. (C) Zr-MOF photoluminescence spectra. (D) CuNCs@Zr-MOF photoluminescence spectra. (E) Excitation-dependent emission spectra of CuNCs@Zr-MOF. (F) Photoluminescence stability of CuNCs@Zr-MOF (error bars represent 95% confidence intervals).
