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. 2016 Aug 5;6:31100. doi: 10.1038/srep31100

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(a) Excitation-dependent PL emission spectra and (b) Up-conversion PL emission spectra of as-prepared CDs. (c) PL spectra of as-prepared CDs dispersed in different pH solutions and (d) Time-resolved PL decay and fitting curves for as-prepared CDs.