1：Experimental Design and Method Selection

The study involved the synthesis of carbazole/benzimidazole-based molecules through palladium-catalyzed Suzuki coupling reactions, followed by characterization of their photophysical, electrochemical, and thermal properties. The performance of these molecules as host materials in OLED devices was evaluated.

2：Sample Selection and Data Sources

Samples were synthesized from carbazole and benzimidazole derivatives. Data on photophysical properties were obtained from UV-vis absorption and photoluminescence spectra, while electrochemical properties were measured via cyclic voltammetry.

3：List of Experimental Equipment and Materials

Equipment included a Bruker spectrometer for NMR, Thermo Scientific Evolution 60s UV-vis spectrophotometer for absorption spectra, and Horiba FluoroMax Plus for emission spectra. Materials included carbazole, benzimidazole derivatives, and solvents like toluene and THF.

4：Experimental Procedures and Operational Workflow

The synthesis involved three steps, starting from carbazole derivatives, followed by Suzuki coupling reactions. The OLED devices were fabricated using thermal evaporation, and their performance was characterized using an integrating sphere setup.

5：Data Analysis Methods

Photophysical data were analyzed based on absorption and emission spectra. Electrochemical data were interpreted using cyclic voltammetry. Device performance was evaluated based on external quantum efficiency and efficiency roll-off.