1：Experimental Design and Method Selection:

The study involved the synthesis and characterization of quinoxaline derivatives with different molecular structures (D-A-D and D-π-A-π-D). The electrochemical and photophysical properties were analyzed using cyclic voltammetry, UV-Vis absorption, and fluorescence spectroscopy. OLED devices were fabricated and tested for electroluminescence properties. Quantum-chemical DFT calculations were performed to interpret the results.

2：Sample Selection and Data Sources:

The compounds TQT, CQC, CTQTC, and CVTQTVC were synthesized and characterized. Solutions and solid films were prepared for optical measurements.

3：List of Experimental Equipment and Materials:

Cyclic voltammetry measurements were performed using AUTOLAB PGSTAT100N. Absorption and photoluminescence characteristics were recorded with the Edinburgh Instruments FLS980 spectrometer. OLED devices were fabricated using vacuum deposition techniques.

4：0N. Absorption and photoluminescence characteristics were recorded with the Edinburgh Instruments FLS980 spectrometer. OLED devices were fabricated using vacuum deposition techniques. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The synthesis of compounds was carried out using Suzuki cross-coupling reactions. Electrochemical measurements were conducted in a three-electrode assembly. OLED devices were fabricated by step-by-step deposition of organic semiconductor layers and metal electrodes.

5：Data Analysis Methods:

The data were analyzed using quantum-chemical DFT calculations to explain the electrochemical and photophysical properties of the compounds.