1：Experimental Design and Method Selection:

The study involved designing a frequency-variable high-voltage oscillation circuit with three modules (boosting, frequency conversion, voltage conversion) and preparing dispersed-type inorganic EL devices with variations in layers and materials. Theoretical models for circuit oscillation and impedance were used.

2：Sample Selection and Data Sources:

Four types of EL cells were prepared using ITO glass or ITO/PET film as transparent electrodes, ZnS:Cu,Cl phosphor inks, BaTiO3 dielectric inks, and Ag/C back electrode inks, purchased from ImageTech Inc. and Geomatec Co., Ltd.

3：List of Experimental Equipment and Materials:

Equipment includes a chemical impedance analyzer (IM3590, Hioki EE Co.), plasma process monitor (C7460, Hamamatsu Photonics K.K.), UV-vis spectrophotometer (V-670, Jasco Co.), transformer (HP-068, Toyomizu Dengenkiki Co. Ltd.), variable resistors, CMOS logic IC (TC 4069), MOSFET (2SK 3234), three-terminal regulator (LM 317), and various capacitors and resistors.

4：Experimental Procedures and Operational Workflow:

EL devices were fabricated by coating layers (phosphor, dielectric, back electrode) using a hand coater, drying at 90°C for 20 minutes. The driving circuit was assembled and used to apply voltages (up to 140 Vpp) and frequencies (270 Hz to 2.4 kHz) to the EL cells. Impedance, emission spectra, and absorption spectra were measured.

5：4 kHz) to the EL cells. Impedance, emission spectra, and absorption spectra were measured. Data Analysis Methods:

5. Data Analysis Methods: Data were analyzed using theoretical equations for circuit oscillation and impedance, and spectral data were interpreted based on literature comparisons.