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Kuik, M. (author), Koster, L.J.A. (author), Dijkstra, A.G. (author), Wetzelaer, G.A.H. (author), Blom, P.W.M. (author)We present a quantitative analysis of the loss of electroluminescence in light-emitting diodes (LEDs) based on poly[2-methoxy-5-(2′-ethylhexyloxy)- p-phenylenevinylene] (MEH-PPV) due to the combination of non-radiative trap-assisted recombination and exciton quenching at the metallic cathode. It is demonstrated that for an MEH-PPV LED the...article 2012
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Chen, X. (author), Yuan, C. (author), Wong, C.K.Y. (author), Zhang, G. (author)A molecular modeling strategy is proposed to describe the temperature (T) dependence of solubility parameter (δ) for the amorphous polymers which exhibit glass-rubber transition behavior. The commercial forcefield "COMPASS" is used to support the atomistic simulations of the polymer. The temperature dependence behavior of δ for the polymer is...article 2012
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de Bruyn, P. (author), Moet, D.J.D. (author), Blom, P.W.M. (author)We present an all-solution processed polymer light-emitting diode (PLED) using spincoated zinc oxide (ZnO) and vanadium pentoxide (V2O5) as electron and hole injecting contact, respectively. We compare the performance of these devices to the standard PLED design using PEDOT:PSS as anode and Ba/Al as cathode. We show that the all-solution...article 2012
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Perelaer, J. (author), Abbel, R.J. (author), Wünscher, S. (author), Jani, R. (author), van Lammeren, T. (author), Schubert, U.S. (author)A combination of photonic and microwave flash exposure is used to sinter inkjet printed silver nanoparticles. This approach leads to conductive features on polymer substrates in short times that are compatible with roll-to-roll production. The sequential process of sintering the as-printed features revealed a final conductivity of 40% of bulk...article 2012
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Mikhnenko, O.V. (author), Azimi, H. (author), Morana, M. (author), Blom, P.W.M. (author), Loi, M.A. (author)We developed a new method to accurately extract the singlet exciton diffusion length in organic semiconductors by blending them with a low concentration of methanofullerene[6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The dependence of photoluminescence (PL) decay time on the fullerene concentration provides information on both exciton...article 2012
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- Li, L. (author), van Breemen, A.J.J.M. (author), Khikhlovskyi, V. (author), Smits, E.C.P. (author), Kemerink, M. (author), Broer, D.J. (author), Gelinck, G.H. (author) article 2012
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Sridhar, A. (author), Cauwe, M. (author), Kusters, R.H.L. (author), Fledderus, H. (author), van den Brand, J. (author)The placement and integration of ultra-thin chips (UTCs) on low-cost polymer foils is a key challenge in the realization of large-area flexible electronic products. Such products, are for cost reasons, preferably fabricated on low cost polyester foils like PET/PEN. A disadvantage of these materials is that they have a low thermal stability. As a...conference paper 2012
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Yuan, C. (author), Wei, J. (author), Ye, H. (author), Koh, S. (author), Harianto, S. (author), van den Nieuwenhof, M.A. (author), Zhang, G.Q. (author)This paper demonstrates a heterogeneous integration of solid state lighting (SSL) module, including light source (LED) and driver/control components. Such integration has been realized by the polymer-based reconfigured wafer level package technologies and such structure has been prototyped and tested. The structure design, thermal design...conference paper 2012
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George, A. (author), Stawski, T.M. (author), Unnikrishnan, S. (author), Veldhuis, S.A. (author), ten Elshof, J.E. (author)A simple and cost effective methodology for large area micro and nanopatterning of a wide range of functional materials on flexible substrates is presented. A hydrophobic-hydrophilic chemical contrast was patterned on surfaces of various flexible plastic substrates using molds and shadow masks with which selected areas of the substrate surface...article 2012
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Evaluation of ink-jet printed current collecting grids and bushbars for ITO-free organic solar cellsGalagan, Y.O. (author), Coenen, E.W.C. (author), Sabik, S. (author), Gorter, H.H. (author), Barink, M. (author), Veenstra, S.C. (author), Kroon, J.M. (author), Andriessen, H.A.J.M. (author), Blom, P.W.M. (author)ITO-free organic solar cells with ink-jet printed current collecting grids and high conducting PEDOT:PSS as composite anode are demonstrated. Inkjet printed current collecting grids with different cross-sectional are as have been investigated. The effect of the width and height of the gridlines and busbars has been measured and modeled by direct...article 2012
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- Lu, M. (author), de Bruyn, P. (author), Nicolai, H.T. (author), Wetzelaer, G.-J.A.H. (author), Blom, P.W.M. (author) article 2012
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Lai, W.-Y. (author), Balfour, M.N. (author), Levell, J.W. (author), Bansal, A.K. (author), Burn, P.L. (author), Lo, S.-C. (author), Samuel, I.D.W. (author)Phosphorescent poly(dendrimers) with a norbornene-derived backbone have been synthesized using ring-opening metathesis polymerization with the Grubbs III catalyst. The dendrimers are comprised of a heteroleptic iridium(III) complex core with two 2-phenylpyridyl ligands and a phenyltriazolyl ligand, biphenyl-based dendrons, and 2-ethylhexyloxy...article 2012
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Brondijk, J.J. (author), Asadi, K. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)Most of the envisaged applications of organic electronics require a nonvolatile memory that can be programmed, erased, and read electrically. Ferroelectric field-effect transistors (FeFET) are especially suitable due to the nondestructive read-out and low power consumption. Here, an analytical model is presented that describes the charge...article 2012
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Kalathimekkad, S. (author), Missinne, J. (author), Arias Espinoza, J.D. (author), van Hoe, B. (author), Bosman, E. (author), Smits, E. (author), Mandamparambil, R. (author), van Steenberge, G. (author), Vanfleteren, J. (author)This paper describes the development of a low-cost technology platform for fluorescence-based optochemical sensors. These sensors were constructed by incorporating fluorescent sensing elements in the core of multimode waveguides or lightguides, and have applications in medical, biochemical and environmental diagnostics. Flexible lightguides were...conference paper 2012
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Lira-Cantu, M. (author), Tanenbaum, D.M. (author), Norrman, K. (author), Voroshazi, E. (author), Hermenau, M. (author), Lloyd, M.T. (author), Teran-Escobar, G. (author), Galagan, Y.O. (author), Zimmermann, B. (author), Hösel, M. (author), Dam, H.F. (author), Jørgensen, M. (author), Gevorgyan, S. (author), Lutsen, L. (author), Vanderzande, D. (author), Hoppe, H. (author), Rösch, R. (author), Würfel, U. (author), Andriessen, H.A.J.M. (author), Rivaton, A. (author), Uzunoglu, G.Y. (author), Germack, D. (author), Andreasen, B. (author), Madsen, M.V. (author), Bundgaard, E. (author), Krebs, F.C. (author)This work is part of the inter-laboratory collaboration to study the stability of seven distinct sets of state-of-the-art organic photovoltaic (OPVs) devices prepared by leading research laboratories. All devices have been shipped to and degraded at the Danish Technical University (DTU, formerly RISO-DTU) up to 1830 hours in accordance with...conference paper 2012
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Perelaer, J. (author), Abbel, R.J. (author), Layani, M. (author), Grouchko, M. (author), Magdassi, S. (author), Schubert, U.S. (author)Inkjet printing is a nascent technology that developed during the last decades from only printing text and graphics into an important scientific research tool for R&D, where printers are used as a highly reproducible non-contact patterning tool. In contrast to lithography, inkjet printing is an additive technique that requires only small amounts...conference paper 2011
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Chen, X.P. (author), Yuan, C.A. (author), Wong, C.K.Y. (author), Koh, S.W. (author), Zhang, G.Q. (author)We report a molecular modelling study to validate the forcefields [condensed-phase optimised molecular potentials for atomistic simulation studies (COMPASS) and polymer-consistent forcefield (PCFF)] in predicting the physical and thermophysical properties of polymers. This work comprises of two key steps: (1) generating and validating the...article 2011
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Galagan, Y.O. (author), Rubingh, J.E.J.M. (author), Andriessen, H.A.J.M. (author), Fan, C.C. (author), Blom, P.W.M. (author), Veenstra, S.C. (author), Kroon, J.M. (author)The presence of a transparent conductive electrode such as indium tin oxide (ITO) limits the reliability and cost price of organic photovoltaic devices as it is brittle and expensive. Moreover, the relative high sheet resistance of an ITO electrode on flexible substrates limits the maximum width of a single cell. We have developed an alternative...article 2011
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Nicolai, H.T. (author), Hof, A. (author), Oosthoek, J.L.M. (author), Blom, P.W.M. (author)The charge transport in blue light-emitting polyspirobifluorene is investigated by both steady-state current-voltage measurements and transient electroluminescence. Both measurement techniques yield consistent results and show that the hole transport is space-charge limited. The electron current is found to be governed by a high intrinsic...article 2011
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Asadi, K. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)Passive or active matrix driving schemes in large displays are prone to high power consumption and cost, respectively. For signage applications such as large out-door displays with low refresh rates there is as yet no technological solution. Here the MEMOLED solution, an organic light-emitting diode with an integrated ferroelectric memory, is...article 2011