1：Experimental Design and Method Selection:

The study used coprecipitation and thermal annealing to synthesize nanophosphors, with a core-shell structure (SiO2 core and phosphor shell) and Bi3+ doping to improve luminescence. Theoretical models include energy transfer mechanisms (e.g., Dexter mechanism).

2：Sample Selection and Data Sources:

Source materials included La(NO3)3·6H2O, Sr(NO3)2, Eu(NO3)3·6H2O, (NH4)2HPO4, Bi(NO3)3·5H2O, and SiO2 particles. Samples were prepared with varying Bi3+ concentrations (3-9 mol%).

3：List of Experimental Equipment and Materials:

Equipment: X-ray diffractometer (XRD, SIEMENS D5000), high-resolution transmission electron microscope (HRTEM, JEOL-3010), field-emission scanning electron microscope (FESEM, JEOL JSM-6330 TF), fluorescence spectrophotometer (Hitachi F-7000). Materials: Chemicals from Alfa Aesar, Acros, Showa; SiO2 particles prepared by St?ber method.

4：0). Materials:

4. Experimental Procedures and Operational Workflow: Precursor solutions were mixed, pH adjusted to 6 with NH4OH, centrifuged, washed, dried at 120°C, and annealed at 1200°C for 2h. For core-shell, SiO2 particles were added with PEG surfactant, mixed with phosphor precursors, stirred, heated at 120°C, centrifuged, dried, and annealed. Bi3+ was added similarly.

5：Experimental Procedures and Operational Workflow:

5. Data Analysis Methods: XRD for crystallinity, SEM/TEM for morphology, XPS for chemical states, PL/PLE spectra for luminescence, EQE measurements, decay curves analysis using single-exponential function, CIE coordinates calculation.