1：Experimental Design and Method Selection:

The study involved the synthesis of a new host material and its compatibility with a red phosphorescent dopant for inkjet printing. The methodology included the use of single solvent systems to achieve uniform film morphology.

2：Sample Selection and Data Sources:

The host material and dopant were synthesized and characterized. The ink solutions were prepared with various solvents to study their printability and film morphology.

3：List of Experimental Equipment and Materials:

Instruments used include Bruker 500 MHz DRXspectrometers for NMR, Waters ACQUITY TQD for mass spectroscopy, Netzsch TG 209 for TGA, Netzsch DSC 204 for DSC, HP 8453 UV-Vis spectrophotometer, HORIBA Fluorogo-3 fluorescence spectrophotometer, CHI660A electrochemical workstation, Brookfield Rotational Viscometer, OneAttension Theta Lite for surface tension and contact angle measurements, JetLab II printer for inkjet printing, Dektak 150 surface profiler, and Veeco NT 9300 for surface morphology characterization.

4：Experimental Procedures and Operational Workflow:

The host material was synthesized and characterized. Ink solutions were prepared and their printability was tested on different substrates. The OLED devices were fabricated and their performance was evaluated.

5：Data Analysis Methods:

The film morphology was analyzed using surface profilers and AFM. The OLED performance was evaluated using current density-voltage-luminance measurements and EL spectra analysis.