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PL spectra of PHM in (a) DMSO and (d) H2O under the excitation wavelengths of 320–430 nm. PL spectra of PHM in DMSO suspension with increasing fraction of H2O excited at (b) 340 nm and (e) 430 nm. A plot of PL intensity of PHM suspensions at (c) 420 nm and (f) 530 nm vs. the fraction of water in the mixed solvent of DMSO–H2O.
