1：Experimental Design and Method Selection:

The study involved preparing thin films of PFN and PFN-AlQ3 composites on glassy carbon electrodes via drop-casting, and investigating their ECL behavior using cyclic voltammetry and photoluminescence measurements. Theoretical calculations were used to propose mechanisms for self-ECL and quenching effects.

2：Sample Selection and Data Sources:

PFN and AlQ3 were used as received. Samples included dilute solutions and thin films on electrodes. Data were collected from electrochemical and optical measurements.

3：List of Experimental Equipment and Materials:

Electrochemical workstation, photomultiplier tube, high voltage power supply, platinum wire counter electrode, Ag/AgCl reference electrode, Shimadzu UV-2500 spectrophotometer, Hitachi F-7000 fluorospectrometer, optical filters, chloroform, acetonitrile, tripropylamine, KCl aqueous solution.

4：Experimental Procedures and Operational Workflow:

Electrodes were polished and cleaned. Films were prepared by drop-casting solutions onto GCE. ECL and current were recorded simultaneously during CV scans. Absorption and fluorescence spectra were measured in-situ. ECL spectra were obtained using optical filters.

5：Data Analysis Methods:

Spectral analysis, peak fitting, and calibration plots were used to analyze data. Limits of detection were calculated based on standard deviations.