1：Experimental Design and Method Selection:

The study aimed at materializing photoinduced morphology change and fluorescence switching in the polymer gel consisting of the supramolecular Py-CN-MBE crosslinker and PAA polymer matrix. The methodology involved the synthesis of Py-CN-MBE via Suzuki coupling reaction and Knovenagel reaction, and the preparation of the polymer gel by heating and cooling process.

2：Sample Selection and Data Sources:

The polymer gel was fabricated using Py-CN-MBE and PAA in ethanol solution.

3：List of Experimental Equipment and Materials:

A Bruker Avance 300 (300 MHz) for NMR spectra, a JEOL, JMS-600W mass spectrometer for mass spectra, a CE Instruments EA1110 elemental analyzer for elemental analysis, a Photo Technology International, Felix32 QM-40, and a Varian, Cary Eclipse Fluorescence spectrophotometer for photoluminescence emission spectra, a FluoTime200 spectrometer for time-resolved fluorescence lifetime experiments, a Nicolet 6700 (Thermo Scientific) spectrometer for FT-IR spectra, and an advanced rheometric expansion system (ARES) rheometer for rheological measurements.

4：Experimental Procedures and Operational Workflow:

The polymer gel was prepared by heating and cooling process, and UV-irradiated sol was prepared by irradiating 365 nm UV light.

5：Data Analysis Methods:

The decay time fitting procedure was carried out with the instrument response function (IRF) by using a Fluofit software.