01 - Physical, Chemical and Earth Sciences

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Now showing 1 - 14 of 14

Activity of surface active substances determined from their surface excess

( 2005) Andersson, Gunther ; Krebs, Thomas ; Morgner, Harald
Angle resolved ion scattering spectroscopy at surfaces of pure liquids: topography and orientation of molecules

( 2005) Andersson, Gunther
Angle resolved ion scattering spectroscopy reveals the local topography around atoms in a liquid surface

( 2005) Andersson, Gunther ; Krebs, Thomas ; Morgner, Harald
Anions of Alkali Halide Salts at Surfaces of Formamide Solutions: Concentration Depth Profiles and Surface Topography

( 2007) Andersson, Gunther ; Morgner, Harald ; Cwiklik, Lukasz ; Jungwirth, Pavel
Charge transport and trapping in Cs-doped poly(dialkoxy-p-phenylene vinylene) light-emitting diodes

( 2004) Gommans, Hans H P ; Kemerink, Martijn ; Andersson, Gunther ; Pijper, Ralf M T
Chemical Potential of a Nonionic Surfactant in Solution

( 2006) Krebs, Thomas ; Andersson, Gunther ; Morgner, Harald
Electron energy loss spectroscopy of liquid glycerol

( 2007) Krebs, Thomas ; Andersson, Gunther ; Morgner, Harald
Energy-loss straggling of helium projectiles at low kinetic energies

( 2007) Andersson, Gunther
Energy-loss straggling of helium projectiles at low kinetic energies: Deconvolution of concentration depth profiles of inorganic salt solutes in aqueous solutions

( 2008) Andersson, Gunther ; Morgner, Harald ; Pohl, Hartwig
Increased layer interdiffusion in polyelectrolyte films upon annealing in water and aqueous salt solutions

( 2006) Krebs, Thomas ; Tan, Hazel L ; Andersson, Gunther ; Morgner, Harald ; Van Patten, Gregory
Interface formation in K doped poly(dialkoxy-p-phenylene vinylene) light-emitting diodes

( 2003) Gommans, Hans H P ; Denier van der Gon, Arnaud W ; Andersson, Gunther ; van Ijzendoorn, Leo J ; Pijper, Ralf M T ; Brongersma, Hidde Herman

Manufacturing of Al/K/OC1C10 poly(p-phenylene vinylene)/indium–tin–oxide light emitting diode structures by physical vapor deposition of K onto the emissive polymer layer has been characterized by electroluminescence and ion spectroscopy. Varying the deposited K areal density from 3.9×1012 to 1.2×1014 atoms cm−2 the external efficiency rises from 0.01 to 1.2 Cd A−1. Spectra obtained by ion scattering analysis demonstrate the overall absence of K at the polymer outermost surface layer, and diffusion up to a depth of 200 Å. Depth profiles have been derived, and were modeled using an irreversible first order “trapping” reaction. Trapping may stem from confinement of the electron at a conjugated segment, that was donated through charge transfer typical for alkali/π-conjugated systems. This study demonstrates that evaporation of low work function metals onto organic systems should not be depicted as simple layered stacking structures. The enhanced electroluminescence with submonolayer K deposition is attributed to the shift of the recombination zone away from the Al cathode, which is demonstrated to prevail over the known exciton quenching mechanism due to the formation of gap states.
Internal structure of polyelectrolyte multilayers probed via neutral impact collision ion scattering spectroscopy

( 2005) Tan, Hazel L ; Krebs, Thomas ; Andersson, Gunther ; Neff, David ; Norton, Michael ; Morgner, Harald ; Van Patten, Gregory
Liquid metals as electrodes in polymer light emitting diodes

( 2003) Andersson, Gunther ; Gommans, H H P ; Denier van der Gon, A W ; Brongersma, H H
Segregation of Inorganic Ions at Surfaces of Polar Nonaqueous Liquids

( 2007) Cwiklik, Lukasz ; Andersson, Gunther ; Dang, Liem X ; Jungwirth, Pavel