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The optical properties of BRF. (a) Ultraviolet-visible (UV-vis) absorption, fluorescence excitation and emission spectra of BRF. Insert: images of the BRF observed under sunlight and UV light (365 nm), respectively; (b) fluorescence emission spectra of BRF with irradiation of various excitation wavelengths; (c) effect of temperature on the fluorescence intensity of BRF at the emission of 524 nm.
