Tomoyuki Tachikawa

34.3: High-Resolution Full-Color Polymer Light-Emitting Devices Using Photolithography

We have developed a novel method of patterning light emitting polymers using photolithography for the fabrication of full color polymer light emitting diode (PLED) displays. We have achieved this method by applying an insolubilization technique of PEDT/PSS to a conventional photolithography. Using this method, we fabricated PLEDs with a resolution of 200ppi, which is the highest resolution yet reported without a color filter.

55.4: A Novel Hole-Injection Layer with the Ability of Forming Hydrophobic-Hydrophilic Patterns

A novel hole injection layer for organic light-emitting diode (OLED) has been developed. It consists of a photocatalyst based on TiO2, and provides good control of the formation of hydrophobic-hydrophilic patterns by exposure to UV light. A bilayer device consisting of photocatalyst and emitting layers exhibits the same EL performance as one using PEDOT:PSS for the hole injection layer. Finally, this method was used to fabricate 85-ppi full-color OLED panels.