1：Experimental Design and Method Selection:

The study focused on obtaining a stable perovskite quantum dot ink and fabricating a matrix light-emitting device using inkjet printing. The method included the synthesis of FA

2：3Cs7PbBr3 perovskite quantum dots, purification with oleylamine, and formulation of an ink with octane:

dodecane cosolvent.

3：Sample Selection and Data Sources:

FA0.3Cs0.7PbBr3 perovskite quantum dots were synthesized in the lab. The ink's stability and film quality were assessed through storage tests and film morphology analysis.

4：3Cs7PbBr3 perovskite quantum dots were synthesized in the lab. The ink's stability and film quality were assessed through storage tests and film morphology analysis. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Instruments included a UV–visible spectrophotometer, photoluminescence spectrometer, X-ray diffractometer, TEM, and inkjet printing setup. Materials included PEDOT:PSS, PVK, poly-TPD, and various chemicals for PeQD synthesis.

5：Experimental Procedures and Operational Workflow:

The process involved PeQD synthesis, ink formulation, device fabrication by inkjet printing, and performance evaluation.

6：Data Analysis Methods:

Device performance was analyzed using current density–voltage–luminance measurements, EL spectra, and efficiency calculations.