1：Experimental Design and Method Selection:

The study uses single-particle spectroscopy to probe the effects of local environment and applied electric field on photoluminescence properties. It involves steady-state and time-resolved PL imaging and spectroscopy in inert (PMMA) and conductive (PVK) matrices, with electric field applied in a capacitance-like device. Theoretical models include truncated power-law fitting for blinking analysis and Stark effect equations.

2：Sample Selection and Data Sources:

CsPbBr3 nanocrystals synthesized with slight modifications from Protesescu et al.'s method, dispersed in PMMA or PVK matrices. Samples prepared by spin-casting onto cover glasses or ITO-coated substrates for electric field experiments.

3：List of Experimental Equipment and Materials:

Equipment includes absorption spectrometer (V760, Jasco), photoluminescence spectrometer (Quantaurus-QY, Hamamatsu Photonics), time-resolved PL lifetime spectrometer (Quantaurus-Tau, Hamamatsu Photonics), absolute PL quantum yield measurement system (Quantaurus-QY, Hamamatsu Photonics), multimodal fluorescence microscope (Olympus IX71), pulsed 485 nm diode laser (LDH-PC-375/485, PicoQuant), EM CCD camera (iXon, Andor Technology), imaging spectrograph (Bunkou Keiki, CLP-50), TCSPC module (TimeHarp 100, PicoQuant), avalanche photodiode detector, oil immersion objective (Olympus UPlan FLN 100x/1.3 NA), dc voltage source (multimeter, Keithley/Tektronics), function generator. Materials include CsPbBr3 NCs, PMMA (Mw~350000, MERCK/Sigma Aldrich), PVK (Mn~25000-50000, MERCK/Sigma Aldrich), ITO-coated cover glass, Al cathode.

4：3 NA), dc voltage source (multimeter, Keithley/Tektronics), function generator. Materials include CsPbBr3 NCs, PMMA (Mw~350000, MERCK/Sigma Aldrich), PVK (Mn~25000-50000, MERCK/Sigma Aldrich), ITO-coated cover glass, Al cathode. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Synthesis of CsPbBr3 NCs, dispersion in polymer matrices, sample preparation by spin-casting, single-particle PL imaging and spectroscopy with and without applied electric field, data acquisition for intensity trajectories, spectra, and lifetime measurements, electric field application and modulation, data analysis using ImageJ, OriginPro, MATLAB.

5：Data Analysis Methods:

Analysis includes background correction, intensity thresholding for ON, GRAY, OFF states, probability density distributions with truncated power-law fitting, fractional time calculations, Gaussian fitting for spectral peaks, correlation plots between intensity and lifetime, Stark effect fitting with linear and quadratic terms.