We demonstrated high-brightness large-area, white organic lightemitting diode (OLED) consisting of printing-processed organic semiconductor layers. Meniscus printing process was applied to the substrate with 2 μm-high stripe-shape auxiliary electrodes. The OLED panel showed white emission all over the whole emitting area of 58 mm × 52 mm, high average luminance of 10,000 cd/m 2 , luminance uniformity of 40 %, and high luminous flux of 95 lm.
We fabricated a transmissive one‐side‐emission organic light emitting diode (OLED) based on a stripe‐shaped cathode. The fabricated transmissive OLED whose panel size is 180 × 90 mm2 showed high transmittance of 68% with the luminance ratio of the bright side to the dark side of 70.
We have developed a digital fabrication process using high-resolution liquid toner electrophotography, consisting of fine liquid toner, a high-resolution exposure system, and nonelectrical transfer. Fine pitch multiline patterns of Cu wiring can be obtained by printing fine lines with seed toners and by electroless plating deposited on lines. Submicron-diameter seed toners have superfine conductive particles on their surfaces. Adhesion between the seed toner layer and Cu layer was increased by applying surface modification. Multiline patterns of 1 pixel line width (21.6 m) with the volume resistivity of 2.1ϫ 10 −6 Ωcm were realized by using a 1200 dpi resolution light-emitting diode. Furthermore, the development process of multiline patterns with 2540 dpi resolution was examined by numerical simulations based on the electrophoretic characteristics of liquid toner and on the electrostatic forces. The capability of multiline-pattern formation of line and space (L/S)ϭ10/10 m was confirmed. The actual toner images of L/Sϭ10/10 m multiline pattern were obtained by using a 2540 dpi resolution luster scanning unit (LSU). Theoretical and experimental results confirm that the fabrication process using liquid toner electrophotography is available for realizing high-resolution multiline patterns.
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