1：Experimental Design and Method Selection:

The phosphor was synthesized using the co-precipitation method due to its advantages such as easy process, homogeneous mixing, high yield, low cost, and short reaction time. The method involved dissolving raw materials in deionized water, stirring, adding PEG-4000, adjusting pH with NH4OH, aging, filtering, washing, drying, and sintering at 1000°C for 2 hours.

2：Sample Selection and Data Sources:

High-purity raw materials including Ca(NO3)2?4H2O, Bi(NO3)3?5H2O, Dy(NO3)3?xH2O, and H3PO4 were used. Dy3+ concentration was varied from 1.0 to 10.0 mol% to study concentration effects.

3：0 to 0 mol% to study concentration effects. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included Rigaku Miniflex 9-II X-ray diffractometer, PerkinElmer Frontier FT-IR spectrometer, ZEISS EVO MA10 FE-SEM, Shimadzu RF-5301PC spectrofluorophotometer, Edinburgh F900 spectrometer, and Ocean Optics HR4000 spectrophotometer. Materials included Ca(NO3)2?4H2O, Bi(NO3)3?5H2O, Dy(NO3)3?xH2O, H3PO4, PEG-4000, NH4OH, KBr, DI water, and ethanol.

4：Experimental Procedures and Operational Workflow:

Synthesis involved dissolving precursors, stirring, adding PEG-4000, pH adjustment to 7 with NH4OH, aging for 2 hours, filtration, washing with DI water and ethanol, drying at 100°C for 12 hours, and sintering at 1000°C for 2 hours. Characterization included XRD for phase analysis, FT-IR for vibrational studies, FE-SEM for morphology, PL for luminescence, lifetime decay measurements, and temperature-dependent PL for thermal stability.

5：Data Analysis Methods:

Structural analysis used FullProf software for Rietveld refinement. Crystallite size and strain were calculated using Debye-Scherrer and Williamson-Hall methods. Luminescence data were analyzed for emission spectra, CIE coordinates, CCT, lifetime decay fitting with biexponential equations, and activation energy using Arrhenius equation.