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. Author manuscript; available in PMC: 2018 Apr 13.
Published in final edited form as: Nanoscale. 2017 Apr 13;9(15):4928–4933. doi: 10.1039/c7nr00888k

Fig. 2.

Fig. 2

Characterization of the photoluminescence property and UCPL property of pRF-GQDs. (a) Representative images of pRF-GQDs under indicated pHs. (b) Photostabilities of pRF-GQDs. pRF-GQDs in solution were continuously irradiated using a 400 W xenon lamp. I and I0 represent the fluorescence intensities at the emission peak before and after irradiation, respectively. After 24 h irradiation, no obvious decrease was seen. (c, d) UV-vis absorption and photoluminescence spectra of pRF-GQDs at pH 6.7 (c) and pH 6.8 (d). (e, f) UCPL spectra and photographs (insets) of pRF-GQDs at pH 6.7 (e) and pH 6.8 (f).