1：Experimental Design and Method Selection

The study involved the synthesis of a novel oligomer 5QnQnPV with a quadrupolar A-π-A-π-D-π-A-π-A electronic structure, followed by its characterization using various spectroscopic and electrochemical techniques. Theoretical studies were conducted using DFT simulations.

2：Sample Selection and Data Sources

The oligomer was synthesized from compounds prepared according to literature procedures. Characterization data were obtained from experiments conducted in the study.

3：List of Experimental Equipment and Materials

Agilent Varian instrument (400 MHz), Perkin–Elmer Frontier spectrophotometer, JEOL AccuTOF instrument, Perkin–Elmer Lambda XLS spectrophotometer, Perkin–Elmer LS55 spectrophotometer, SDTA851 Mettler Toledo analyzer, NTEGRA platform, PARSAT? 2273 electrochemical instrument, WS-650sZ-6NPP/A1/AR1 spinner from Laurell Technologies, Balzers thermal evaporator model 510, Keithley 2460 electrometer, QE65000 Scientific-grade spectrometer from Ocean Optics.

4：Experimental Procedures and Operational Workflow

The synthesis involved a Heck reaction under nitrogen atmosphere. Characterization included NMR, FT-IR, MS, UV-Vis, fluorescence spectra, thermal analysis, AFM, and cyclic voltammetry. OLED fabrication involved spin-coating and thermal evaporation techniques.

5：Data Analysis Methods

Data analysis included statistical analysis of AFM images, calculation of HOMO/LUMO energies from cyclic voltammetry, and theoretical simulations using Gaussian 09.