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Kamijo, T. (author), de Winter, S. (author), Panditha, P. (author), Meulenkamp, E. (author)The transparent conductive electrode (TCE) is a key component of organic light-emitting diodes (OLEDs). High-resolution printed metal grids are a promising alternative to indium tin oxide (ITO). We present results for evaporated OLEDs with a printed copper (Cu) grid with line width below 3 μm. The use of a thick doped hole injection layer (HIL)...article 2022
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de Braaf, B. (author), Rops, C.M. (author), Storm, C. (author)In atomic layer deposition (ALD), thin layers of materials are deposited on a substrate with atomic layer precision in the vertical direction. The ability to control layer growth in the lateral direction as well is expected to greatly increase the potential of ALD as a path to the bottom-up additive fabrication of electronic devices like solar...article 2021
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Prakasam, V. (author), Tordera, D. (author), di Giacomo, F. (author), Abbel, R. (author), Langen, A. (author), Gelinck, G. (author), Bolink, H.J. (author)Halide perovskites have been gaining considerable attention recently for use in light-emitting applications, due to their bandgap tunability, color purity and low cost fabrication methods. However, current fabrication techniques limit the processing to small-area devices. Here, we show that a facile N 2 gas-quenching technique can be used to...article 2019
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van de Weijer, P. (author), Akkerman, H.B. (author)In order to protect a flexible OLED on plastic foil against water from the ambient atmosphere a top and bottom thin-film encapsulation (TFE) is necessary. A TFE stack SiN-OCP-SiN with getter in OCP results in excellent shelf lifetime. However, the getter particles result in light scattering that is lost upon water ingress in the stack. As a...article 2019
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Malinowski, P.E. (author), Ke, T.-H. (author), Akkerman, H. (author), Nakamura, A. (author), Shanmugam, S. (author), van Breemen, A. (author), Velpen, D.V. (author), Vandenplas, E. (author), Hagelsieb, L.M. (author), Verscheuren, L. (author), Genoe, J. (author), Dehaene, W. (author), Kronemeier, A.J. (author), Steudel, S. (author), Gelinck, G. (author), Heremans, P. (author)Patterning organic materials by photolithography enables not only high-resolution, side-by-side RGB OLED arrays, but also the introduction of organic photodetector in the same frontplane. We show patterned active matrix displays processed on flexible backplane. Furthermore, we demonstrate OPD patterning proof-of-concept. These are the building...conference paper 2019
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- Kronemeijer, A.J. (author), Akkerman, H. (author), van der Steen, J.L. (author), Steudel, S. (author), Pendyala, R. (author), Panditha, P. (author), Bel, T. (author), van Diesen, K. (author), de Haas, G. (author), Maas, J. (author), de Riet, J. (author), Rovers, M. (author), Verbeek, R. (author), Nag, M. (author), Verschueren, L. (author), Genoe, J. (author), Dehaene, W. (author), Lu, Y.J. (author), Chiang, S.C. (author), Huang, Y.Y. (author), Yeh, M.H. (author), Gelinck, G. (author) conference paper 2018
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Arutinov, G. (author), Giesbers, M. (author), van Waalwijk van Doorn, S. (author), Chiappini, F. (author), Kusters, R. (author), van den Brand, J. (author)This paper reports the use of Laser-induced Forward Transfer (LIFT) technology for printing of multilayer flexible circuitries and the fabrication of micro-bumps for flip-chip bonding of packaged LEDs and bare die microcomponents. Bonding of passive and functional surface mount devices (SMD) on low-temperature polyethylene terephthalate (PET)...conference paper 2018
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Prakasam, V. (author), Di Giacomo, F. (author), Abbel, R. (author), Tordera, D. (author), Sessolo, M. (author), Gelinck, G. (author), Bolink, H.J. (author)Organic-inorganic metal halide perovskites are emerging as novel materials for light-emitting applications due to their high color purity, band gap tunability, straightforward synthesis, and inexpensive precursors. In this work, we improve the performance of three-dimensional perovskite light-emitting diodes by tuning the emissive layer...article 2018
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Malinowski, P.E. (author), Ke, T. (author), Nakamura, A. (author), Vicca, P. (author), Kronemeijer, A.J. (author), Ameys, M. (author), van der Steen, J.L. (author), Steudel, S. (author), Kamochi, Y. (author), Iwai, Y. (author), Gelinck, G. (author), Heremans, P. (author)This paper describes the potential of hi-res display fabrication using OLED photolithography. We demonstrate 1250 ppi multicolor arrays, pixel scaling down to 3 μm pitch, integration in active displays, and improving lifetime after patterning (200 hours T75, smOLEDs). Photolithography can enable low-cost, high resolution displays for the 8K – VR...conference paper 2017
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- Herrmann, A. (author), Erich, S.J.F. (author), Ven, L.G.J.V.D. (author), van Driel, W.D. (author), van Soestbergen, M. (author), Mavinkurve, A. (author), de Buyl, F. (author), Adan, O.C.G. (author) conference paper 2017
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Oostra, A.J. (author), Reddy, A. (author), Smits, E.C.P. (author), Abbel, R.J. (author), Groen, W.A. (author), Blom, P.W.M. (author), Michels, J.J. (author)A method is presented to self-repair cracks in embedded silver grid structures used in large area organic electronics. The repair procedure is based on electro-deposition, incited by the application of a moderate DC voltage across the crack. During this process the organic anode that is in direct electrical contact with the silver grid,...article 2016
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Senes, A. (author), Meskers, S.C.J. (author), Dijkstra, W.M. (author), van Franeker, J.J. (author), Altazin, S. (author), Wilson, J.S. (author), Janssen, R.A.J. (author)The low light-outcoupling efficiency of organic light emitting diodes (OLEDs) is limiting their performance. Orientation of the transition dipole moment of the emitting molecules in the plane of the diodes can improve the luminance of OLEDs. While the orientation of evaporated small-molecule materials has been studied in the past few years, not...article 2016
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van de Weijer, P. (author), Lu, K. (author), Janssen, R.R. (author), de Winter, S.H.P.M. (author), Akkerman, H.B. (author)When organic light-emitting diodes (OLEDs) are exposed to the ambient atmosphere, water penetration through pinholes in the cathode results in the formation of non-emissive areas (black spots) due to local oxidation of the cathode around the pinhole. This degradation effect severely limits the lifetime of OLED devices and requires high...article 2016
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Perpiñà, X. (author), Werkhoven, R.J. (author), Vellvehi, M. (author), Jakovenko, J. (author), Jordà, X. (author), Kunen, J.M.G. (author), Bancken, P. (author), Bolt, P.J. (author)This paper studies the thermal influence of a light-emitting diode (LED) driver on a retrofit LED lamp, also reporting on a procedure for its thermal characterization and multiscale modeling. In this analysis, temperature is measured by infrared thermography and monitoring specific locations with thermocouples. Experimental results point out...article 2015
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Janka, M. (author), Gierth, R. (author), Rubingh, J.E. (author), Abendroth, M. (author), Eggert, M. (author), Moet, D.J.D. (author), Lupo, D. (author)We report the self-aligned passivation of a current distribution grid for an organic light emitting diode (OLED) anode using a pulsed Joule heating method to align the passivation layer accurately on the metal grid. This method involves passing an electric current through the grid to cure a polymer dielectric. Uncured polymer is then rinsed away...article 2015
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Deutz, D.B. (author), Tempelman, E. (author), van der Zwaag, S. (author), Groen, W.A. (author)To enable the design of more intuitive product user interfaces, the prospects of matching piezoelectric touch sensors with flexible organic light emitting diode (OLED) technology are investigated. Low stiffness piezoelectric composite sensors, combining piezoelectric Pb(Zr,Ti)O3 powder with a polymer matrix, are prepared and compared to existing...article 2015
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Jolt Oostra, A. (author), Blom, P.W.M. (author), Michels, J.J. (author)Pinholes in the emitting layer of an organic light emitting diode (OLED), e.g. induced by particle contamination or processing flaws, lead to direct contact between the hole-injection layer (HIL) and the cathode. The resulting short circuits give rise to catastrophic device failure. We demonstrate that these short circuits can be effectively...article 2014
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Naithani, S. (author), Mandamparambil, R. (author), Fledderus, H. (author), Schaubroeck, D. (author), van Steenberge, G. (author)The fast-growing market of organic electronics stimulates the development of versatile technologies for structuring thin-film materials. Ultraviolet lasers have proven their full potential for patterning organic thin films, but only a few studies report on interaction with thin-film barrier layers. In this paper, we present an approach in which...article 2014
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Eggenhuisen, T.M. (author), Coenen, M.J.J. (author), Slaats, M.W.L. (author), Groen, W.A. (author)The transfer of laboratory scale solution processing of organic electronics to large area roll-to-roll production requires the use of up-scalable deposition techniques. Furthermore, industrial production demands the omission of halogenated and other harmful solvents. Here, the authors discuss large area inkjet printing using industrial...article 2014
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Abbaszadeh, D. (author), Nicolai, H.T. (author), Crəciun, N.I. (author), Blom, P.W.M. (author)The operation of blue light-emitting diodes based on polyspirobifluorene with a varying number of N,N,N′,N′ tetraaryldiamino biphenyl (TAD) hole-transport units (HTUs) is investigated. Assuming that the electron transport is not affected by the incorporation of TAD units, model calculations predict that a concentration of 5% HTU leads to an...article 2014