1：Experimental Design and Method Selection:

The study uses a traditional solid-state reaction method to synthesize Sr2Ce(1?x)Eu4?x/2 phosphors with varying Eu3+ concentrations (x = 0, 1%, 10%, 20%). Photoluminescence (PL) spectroscopy is employed to characterize the optical properties, and the bond-energy method is applied to analyze site occupancy.

2：Sample Selection and Data Sources:

Samples are synthesized from stoichiometric amounts of SrCO3 (A.R.), CeO2 (99.99%), and Eu2O3 (A.R.), heated at 1100°C for 6 hours in air.

3：99%), and Eu2O3 (A.R.), heated at 1100°C for 6 hours in air. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Materials include SrCO3 (A.R.), CeO2 (99.99%), Eu2O3 (A.R.). Equipment includes a Bruker D8 Advance X-ray Diffractometer for XRD analysis and an Edinburgh FLS 980 Spectro Fluorometer for PL measurements.

4：99%), Eu2O3 (A.R.). Equipment includes a Bruker D8 Advance X-ray Diffractometer for XRD analysis and an Edinburgh FLS 980 Spectro Fluorometer for PL measurements. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Mix raw materials in a mortar, heat at 1100°C for 6 hours, cool to room temperature. Perform XRD for phase purity and PL spectroscopy for excitation and emission spectra at room temperature.

5：Data Analysis Methods:

Analyze PL spectra to observe intensity changes and energy transfer. Use bond-energy calculations based on crystallographic data and equations provided to determine site occupancy preferences.