Multiple switching behaviors of poly(N-isopropylacrylamide) hydrogel with spironaphthoxazine and D-π-A type dye

► A multi-switchable polymer was prepared by radical polymerization. ► Fluorescence intensity of the polymer hydrogel was temperature-dependent. ► Reversible modulation of fluorescence was achieved by irradiation with UV/vis. ► Polymer hydrogel exhibited spectra change by Cu2+ cations as well as acid units.