1：Experimental Design and Method Selection:

High-temperature solid-state reaction was used to synthesize Ba2-xGa2GeO7:xBi3+ phosphors. Rietveld refinement and various spectroscopic techniques were employed to analyze crystal structure and luminescent properties.

2：Sample Selection and Data Sources:

Stoichiometric amounts of BaCO3, Ga2O3, GeO2, and Bi2O3 were used as starting materials. Samples with varying Bi3+ concentrations and vacancy conditions were prepared.

3：List of Experimental Equipment and Materials:

X-ray diffractometer (Bruker-D8 Focus), spectrofluorometer (FLS 920, Edinburgh Instruments), SEM (S-4800, Hitachi), XPS (Thermo ESCALAB 250), ICP-OES (Thermo Scientific X Series 2), and others.

4：Experimental Procedures and Operational Workflow:

Materials were ground, sintered at 1150°C for 10 hours, and characterized using XRD, PL, PLE, decay curves, and thermal stability tests. WLED devices were fabricated and tested.

5：Data Analysis Methods:

Data were analyzed using GSAS for Rietveld refinement, Kubelka-Munk function for band gap calculation, and exponential decay fitting for lifetime analysis.