Abstract
We examine the electro-optic effects of a fluorinated self-assembled monolayer (FSAM) on polymeric light-emitting diodes (PLEDs) and organic light-emitting diodes (OLEDs). Owing to the high electronegativity of fluorine atoms, which decreases the hole-injection barrier-height, the LEDs with FSAM as the hole-injection layer (HIL) have the highest current density. The current densities of the LEDs with FSAM, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), and without HIL were estimated to be approximately 1, 0.24, and 0.06 A/cm2 respectively at 10 V. During the operational lifetime of the PLEDs, the driving voltage with FSAM is suppressed owing to the ohmic contact of the FSAM-modified ITO.
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