1：Experimental Design and Method Selection:

The study uses steady-state and time-resolved photoluminescence spectroscopies to investigate the PL properties of nanocrystals over a temperature range of 78 to 350 K. The design includes synthesizing nanocrystals via hot-injection method, preparing samples on substrates, and performing PL measurements with various excitation sources and detectors.

2：Sample Selection and Data Sources:

Pure and Mn-doped CsPbCl3 nanocrystals are synthesized and used as samples. Data is collected from PL spectra and dynamics measurements.

3：List of Experimental Equipment and Materials:

Equipment includes a CW laser (UV-FN-360-20mW, CNI), spectrometers (IHR550, Horiba; SP-2500, Princeton Instruments), CCD detectors (Synapse, Jobin Yvon; PI-MAX-1024i, Princeton), TCSPC systems (Boston Electronics), monochromator (Omni-λ300, Zolix), photomultiplier (PMTH-S1-R2658, Zolix), oscilloscope (TDS3054B, Tektronix), cryostat (Cryo-77, Oriental Koji), TEM microscope (Tecnai G220 S-Twin), UV-Vis spectrometer (TU-1901, Persee), spectrofluorometer (F-4500, Hitachi). Materials include CsPbCl3 NCs, n-hexane, BK7 glass substrate, oleylamine, oleic acid, MnCl2, PbCl2, octadecene, Cs-oleate solution.

4：Experimental Procedures and Operational Workflow:

Nanocrystals are synthesized by hot-injection method, dropped on a substrate, and PL measurements are conducted at varying temperatures. Excitation is done with lasers at specific wavelengths, and PL spectra and dynamics are recorded using the specified equipment.

5：Data Analysis Methods:

Data is analyzed using biexponential fitting for PL decays, fitting to models for temperature-dependent intensity and linewidth (e.g., Eq. 1 and 2 in the paper), and statistical techniques to extract parameters like exciton binding energy and phonon contributions.