1：Experimental Design and Method Selection:

The study used a PMT-based measurement system to calibrate phosphor samples under varying pressures (20-200 kPa) and temperatures (298-873 K). The methodology involved fabricating samples with different morphologies and analyzing luminescent lifetime changes.

2：Sample Selection and Data Sources:

Samples included phosphor powder, pressed phosphor disc (simulating agglomerated particles), and chemically bonded phosphor coating. MFG powder with 1~2 μm size was used, prepared through drying and sieving.

3：List of Experimental Equipment and Materials:

Equipment included a hot/cold stage (Instec, USA), 405 nm diode laser (OEM-HD-405, CNI Laser, China), photomultiplier tube module (h9305-03, Hamamatsu, Japan), oscilloscope (Tektronix DPO2002B), and SEM for microstructure analysis. Materials included MFG phosphor, HPC binder (ZYP coatings, Oak Ridge, USA), and pure N2 gas.

4：Experimental Procedures and Operational Workflow:

Samples were placed on a silver platform in the hot/cold stage. Temperature was controlled via heating/cooling, and pressure was regulated with a pump. Laser excitation at 405 nm was used, and PMT signals were recorded and averaged over 512 samples. Data processing involved background subtraction, intensity normalization, and single-exponential decay fitting to acquire lifetime.

5：Data Analysis Methods:

Lifetime was derived from fitting decay curves. Statistical analysis compared results under different pressures and temperatures, with validation against existing literature data.