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Ink-Jet Instability Behavior Analysis for Polymer Light Emitting Diodes Fabrication

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A polymer light emitting diodes (PLED) is manufactured by thermal bubble ink-jet (TIJ) printing technique. This study is to solve the innate character of ink-jet instability causes the device defect in manufacturing process. Analysis shows that the ink-jet instability occurs at the beginning of each strip pixel because of the mechanical inertia force, the head start-driving instability, and the capillary pressure-driving force effects on drop landing on substrate. The mechanical inertia force generally causes an exponential decay of drop position deviation with the printing distance, and the head start-driving instability makes some nozzles have a critical characteristic in drop landing behavior. Besides, we found different bank pattern at start and end side to regulate the pressure difference will dramatic improve the uniformity of the polymer film in drying. The data shows that converging opening channel of bank pattern got uniform polymer film, and a closing channel of bank pattern made a local defect at both end of strip. By this analysis and improvement, the transient instability can be solved at same time not in conflict. Ink-jet line-width can be very stable and consistence, the line-width average is approximately 95.4 μm and the variation is approximately 2.5%. The printing PEDOT layer and the printing Green-PF layer above said PEDOT layer, it appeared a perfect film distribution in both.

Document Type: Research Article

Publication date: 2004-01-01

More about this publication?
  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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