Abstract
Ink formulation with the benzoate-type solvent mixture was designed to provide a mismatch in the surface tension, boiling point, and viscosity toward a stable jet printing on organic light-emitting diode (OLED) pixel pattern cell. Compared with a single component solvent ink, the mixtures showed smoother surface roughness and uniform line printed, while the dried film roughness was further improved by solvent-vapor annealing. Inkjet OLEDs on the 60 to 80 μm-scale pixels were fabricated, and the luminous quantum efficiency behavior of the printed OLEDs were characterized in terms of structural perfection of patterns and in-pixel coverage for different bank boundaries. With the optimum printing recipe and pattern-receptor surface condition, an external quantum efficiency of inkjet device was more than 82% of the value for spin-coating reference.
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