1：Experimental Design and Method Selection:

A solvothermal process was used to synthesize Fe3+-doped BiOBr:Yb3+/Er3+ nanoplates. Methods included XRD for structural analysis, SEM/TEM for morphology, BET for surface area, XPS for chemical states, UV-Vis-NIR absorption spectroscopy, PL spectroscopy, time-resolved PL decay, UC emission spectroscopy, DFT calculations for electronic structures, photocatalytic degradation tests under UV, Vis, NIR, and full spectrum light, photocurrent response measurements, active species trapping experiments, and ESR spectroscopy.

2：Sample Selection and Data Sources:

Samples included pure BiOBr, BiOBr:Yb3+/Er3+ (BYE) with varying Fe3+ concentrations (0%, 1%, 2%, 3%, 4%). RhB dye was used for degradation tests. Data were obtained from experimental measurements and computational simulations.

3：List of Experimental Equipment and Materials:

Equipment included XRD diffractometer, SEM, TEM, BET analyzer, XPS spectrometer, UV-Vis-NIR spectrophotometer, PL spectrometer, time-resolved fluorescence spectrometer, laser for UC excitation (980 nm), photocatalytic reactor with light sources (UV, Vis, NIR, full spectrum), photoelectrochemical cell for photocurrent, ESR spectrometer. Materials included precursors for BiOBr, Yb3+, Er3+, Fe3+ ions, RhB dye, scavengers (EDTA-2Na, t-BuOH, BQ).

4：Experimental Procedures and Operational Workflow:

Synthesis via solvothermal method, characterization using various techniques, photocatalytic activity tests by monitoring RhB degradation under different light irradiations, stability tests through recycling, mechanism studies via trapping experiments and ESR.

5：Data Analysis Methods:

Data analyzed using first-order kinetics for degradation rates, double-exponential fitting for decay times, DFT calculations with GSAS program for Rietveld refinement, statistical analysis of experimental results.