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Title: Study of Drop-on-Demand Inkjet Printing Technology with Application to Organic Light-Emitting Diodes
Keywords: Drop-on-Demand Inkjet Printing, PEDOT:PSS, OLED, Surface Treatment, Drying Behavior, Shape Representation and Mapping
Issue Date: 21-Jan-2010
Citation: ZHOU JINXIN (2010-01-21). Study of Drop-on-Demand Inkjet Printing Technology with Application to Organic Light-Emitting Diodes. ScholarBank@NUS Repository.
Abstract: A drop-on-demand inkjet printing technology has been applied to print poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on a given indium-tin-oxide (ITO) glass substrate to build polymer-based organic light emitting diodes (OLED). In comparison with spin-coating method, device performance of complete OLEDs has been investigated in terms of luminance-current-voltage characteristics, luminous efficiency and power efficiency. Experiments show that device performance based on inkjet-printed films may be better than that based on spin-coated films, as the inkjet-printed film may form more effective surface contact areas with the adjacent film than the spin-coated film. Meanwhile, surface wettability and surface degradation of ITO glass substrates through different surface treatments have been characterized beforehand by contact angle measurements. Different drying process may affect the performance of final OLED devices as it produces different surface morphology of printed thin films. The thesis offers detailed investigations of the following two specific issues on the inkjet printed droplets themselves: characterization of drying behavior of conductive polymer (PEDOT:PSS) drops on the hydrophilic substrate; shape representation and mapping of dried droplet profiles with drying temperature using both Gaussian and thin-plate spline (TPS) radial basis function networks (RBFN). Results can serve as a reference for future work which may be undertaken to obtain specific inkjet printed features that are required in practice.
Appears in Collections:Ph.D Theses (Open)

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