1：Experimental Design and Method Selection:

The phosphors were synthesized using a conventional solid-state reaction method under a reductive atmosphere (5%H2/95%N2) at 1400°C for 2 hours. This method was chosen for its ability to produce dual-emitting centers with distinct thermal quenching behaviors for temperature sensing applications.

2：Sample Selection and Data Sources:

Samples were prepared with varying concentrations of Eu ions (x=0 to

3：16) in Ca8-xZrMg(PO4)6(SiO4):

x(Eu3+, Eu2+). Raw materials included high-purity NH4H2PO4, CaCO3, ZrO2, MgCO3, SiO2, and Eu2O3 from Aladdin (

4：9% or higher purity). List of Experimental Equipment and Materials:

Equipment used includes an X-ray diffractometer (Bruker Axs D2 PHASER), SEM, TEM (Hitachi H-9500), XPS (Thermo Scientific Escalab 250Xi), EPR spectrometer (A300 Bruker), UV-Vis spectrometer (Shimadzu UV-3600), PL spectrometer (HORIBA JOBIN YVON PL3-211-P), and temperature-dependent spectrometer (Everfine EX 1000). Materials are as specified in the raw materials list.

5：0). Materials are as specified in the raw materials list. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Raw materials were weighed, mixed, sintered in alumina crucibles, and crushed to powder. Characterization involved XRD for phase identification, SEM/TEM for morphology, XPS/EPR for valence state analysis, DRS for absorption, PL/PLE for luminescence properties, and temperature-dependent measurements for sensing performance.

6：Data Analysis Methods:

Data were analyzed using Rietveld refinement for XRD, exponential fitting for decay curves, linear fitting for FIR vs. temperature, and activation energy calculations using the Arrhenius equation.