1：Experimental Design and Method Selection:

The phosphor samples were prepared by the high-temperature solid-state reaction method at a calcination temperature of 1000 °C for 2 h in a reducing atmosphere (mixture of 5%H2–95%N2). Different fluxes were added to investigate their effects on the phase formation and luminescence properties.

2：2). Different fluxes were added to investigate their effects on the phase formation and luminescence properties. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Commercially available BaCO3, CaCO3, MnCO3, and Eu2O3 were used as starting materials.

3：List of Experimental Equipment and Materials:

Powder X-ray diffraction (XRD, D/MAX-Ultima, Rigaku) for structure and phase analysis, and a fluorescence spectrophotometer (EVERFINE, EX-1000, China) for photoluminescence properties measurement.

4：Experimental Procedures and Operational Workflow:

The phosphor samples were annealed at 1000 °C for 2 h. The structure and phase were analyzed by XRD, and photoluminescence properties were measured under excitation by a 365 nm source.

5：Data Analysis Methods:

The emission spectra, CIE chromaticity coordinates, and CRI were analyzed based on the photoluminescence spectra.