1：Experimental Design and Method Selection:

The study involved synthesizing Cs4PbBr6 nanoparticles and characterizing their photoluminescence (PL) properties at the single-particle level using wide-field fluorescence microscopy and time-correlated single photon counting (TCSPC) to measure PL intensity and lifetime as functions of temperature.

2：Sample Selection and Data Sources:

Cs4PbBr6 nanoparticles were synthesized via a chemical method involving cesium-oleate and lead bromide precursors. Single particles were isolated on cleaned glass substrates for optical measurements.

3：List of Experimental Equipment and Materials:

Equipment included a home-built wide-field fluorescence microscope based on Olympus IX73, a 450 nm CW diode laser, an EMCCD camera (iXon Ultra 888, Andor), a TCSPC system (Picoharp 300), a supercontinuous laser (Fianium SC-400), an ultraviolet-visible spectrometer (UV-3600, Shimadzu), a transmission electron microscope (JEOL 2010F), and thermoelectric coolers (TLTP-TEC2410-1, Wuhan, China). Materials included CsCO3, oleic acid, n-hexane, HBr, OA, OLA, DMF, PbBr2, toluene, and glass substrates.

4：Experimental Procedures and Operational Workflow:

Nanoparticles were synthesized, characterized by XRD and TEM, and diluted for single-particle deposition. PL intensity and lifetime were measured at various temperatures (20-45°C) using laser excitation, with data collection via EMCCD and TCSPC. Temperature was controlled with thermoelectric coolers.

5：Data Analysis Methods:

PL intensity and lifetime data were analyzed to determine temperature dependence, with linear fits used to calculate sensitivity. Statistical analysis included assessing deviations and repeatability over multiple cycles.