1：Experimental Design and Method Selection

The study involved the synthesis of four novel dispirocyclic compounds and their characterization through thermal, photophysical, and electrochemical analyses. The compounds were then used as host materials in OLED devices to evaluate their electroluminescence performance.

2：Sample Selection and Data Sources

The samples were synthesized using specific chemical reactions involving dispirocyclic compounds and triphenylamine groups. Data were collected from UV-Vis absorption, photoluminescence (PL), phosphorescence (Phos) spectra, and cyclic voltammetry (CV) measurements.

3：List of Experimental Equipment and Materials

Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), UV-Vis absorption spectrometer (Cary 60), fluorescence spectrophotometer (Hitachi F-4600), cyclic voltammetry analyzer (CHI600), and OLED fabrication equipment.

4：Experimental Procedures and Operational Workflow

The synthesis of dispirocyclic compounds followed specific chemical routes. The compounds were characterized using DSC, TGA, UV-Vis, PL, and Phos spectra. OLED devices were fabricated and their performance was evaluated.

5：Data Analysis Methods

Data from UV-Vis, PL, and Phos spectra were analyzed to determine optical energy gaps and triplet energies. CV data were used to estimate HOMO and LUMO energy levels. Device performance was analyzed based on current density–voltage–luminance (J–V–L) characteristics and efficiency metrics.