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  • 1
    Digitale Medien
    Digitale Medien
    Fluorescence Spectroscopy of Oligo(anthrylenevinylenes) (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 7355-7358 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100081a020
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  • 2
    Digitale Medien
    Digitale Medien
    Charge carrier recombination in organic bilayer electroluminescent diodes. I. Theory (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6954-6962 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A previously developed analytic model for charge carrier recombination in bilayer organic light emitting diodes [D. V. Khramtchenkov, V. I. Arkhipov, and H. Bässler, J. Appl. Phys. 79, 9283 (1996)] in which charge transport across the interface between anodic and cathodic cell compartments is impeded by energy barriers is extended to cells of arbitrary thickness of the constituent layers and variable energy barriers. The results indicate that the recombination yield is the result of a complicated interplay between redistribution of the electric field affecting the injection at the electrodes, internal charge accumulation, and field assisted barrier crossing. Unit charge carrier recombination efficiency is predicted to occur at moderate cell voltages and electron injection barriers less than (approximate)0.4 eV. At higher voltages, leakage process across the interface becomes progressively important. With increasing electron-injection barrier, that injection process becomes rate limiting. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365258
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  • 3
    Digitale Medien
    Digitale Medien
    Charge carrier recombination in organic bilayer electroluminescent diodes. II. Experiment (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6963-6967 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Diodes consisting of a hole transporting layer containing tri-stilbeneamine as active medium and a hole blocking layer (an oxadiazole blend) sandwiched between indium-tinoxide and aluminium electrodes have been characterized via both their j(F) characteristics and the dependence of intensity, quantum efficiency, and spectrum of the electroluminescence on the thickness Le of the hole blocking layer. The results are discussed within the framework of the analytic model advanced in the preceding paper. Both the decrease of the effect of electric field screening at the anode due to the space charge accumulation at the internal interface as well as the recombination efficiency with decreasing Le is in good agreement with theory. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365259
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  • 4
    Digitale Medien
    Digitale Medien
    Tail broadening of photocurrent transients in molecularly doped polymers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 967-972 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Tail broadening of nondispersive photocurrent transients has been measured in 1,1-bis(di-4-tolylaminophenyl)cyclohexane-doped polystyrene over a range of concentrations, fields, and temperatures. The results are described by the parameter W, defined as W=(t1/2−t0)/t1/2, where t1/2 is the time for the transient to decay to one-half of its plateau value and t0 the time defined by the intersection of asymptotes of the plateau and trailing edge of the transient. The interpretation of the experimental results leads to the conclusion that energetic disorder is the principal source of broadening of the transients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356452
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  • 5
    Digitale Medien
    Digitale Medien
    A model of electroluminescence in organic double-layer light-emitting diodes (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 9283-9290 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A model has been developed for charge recombination in double-layer organic light-emitting diodes (LEDs) in which charge transport across the interface between the anodic and cathodic cell compartments is impeded by energy barriers. Current flow is assumed to be controlled by the interplay between the field-assisted injection of majority carriers (holes) and minority carriers (electrons) at the contacts and field-assisted barrier crossing, both obeying Fowler–Nordheim-type relations. Charge recombination at the internal interface is considered as the dominant source for electroluminescence. Accumulation of majority carriers at that interface causes an enhancement of the cathodic electric field giving rise to enhanced electron injection. This effect tends to compensate for imbalanced injection due to different energy barriers at the contacts and causes an increase of the luminescence yield as compared to single-layer LEDs. The model is able to predict (i) the redistribution of the electric field inside the LED, (ii) the field dependence of the cell current, (iii) the dependence of the steady state luminescence intensity, (iv) the luminescence yield as a function of the cell current, and (v) the characteristic rise time of the light output, each parametric in the cathodic and the interfacial energy barriers normalized to the energy barrier for hole injection. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362604
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  • 6
    Digitale Medien
    Digitale Medien
    The overshoot effect in transient electroluminescence from organic bilayer light emitting diodes: Experiment and theory (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7514-7525 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Transient electroluminescence (EL) from organic bilayer light emitting diodes addressed by a rectangular voltage pulse often features an overshoot when the voltage is switched off. Experimental results are presented for a variety of hole transporting layers in contact with an oxadiazole layer simultaneously acting both as a blockade for holes and as an electron transport layer. The overshoot occurs in spin coated yet not in vapor deposited samples. A model is developed to rationalize charge recombination under the premise (i) of an interfacial layer of finite thickness between hole and electron transport layers in which both transport molecules coexist and (ii) of interfacial energy barriers impeding both hole and electron passage. It predicts the occurrence of an EL overshoot due to the recombination of stored electrons and holes under the action of their mutual space charge field when the external voltage is switched off. The temporal pattern of the predicted transient EL signal is in good agreement with experiment. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365293
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  • 7
    Digitale Medien
    Digitale Medien
    Charge carrier transport in conjugated polymers (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 9214-9222 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The charge carrier mobility in a ladder-type poly(paraphenylene) (MeLPPP) and a phenylamino-substituted poly(phenylenevinylene) (PPV) derivative (PAPPV) has been studied in detail by using the time-of-flight (TOF) method. In most cases, the TOF signals feature characteristics of nondispersive charge transport in terms of the disorder formalism, although the transition from nondispersive to the dispersive transport regime was observed in PAPPV. Hole mobilities in the range of 10−4 to 7×10−3 cm2/Vs were obtained, depending on electric field and temperature. The influence of disorder on charge transport of the investigated conjugated polymers is discussed. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.478844
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  • 8
    Digitale Medien
    Digitale Medien
    Site-selective fluorescence spectroscopy of poly(vinylcarbazole) (1990)
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 398-405 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00204a008
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  • 9
    Digitale Medien
    Digitale Medien
    Overshoot effect in transient electroluminescence from single layer organic light-emitting diodes (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5554-5560 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We investigate the transient electroluminescence (EL) from organic light-emitting diodes based on tristilbeneamine dispersed in polysulfone. An EL overshoot is observed a few microsecond after reversing the driving voltage. The amplitude of the EL spike can considerably exceed the previous EL level. The maximal EL intensity is strongly influenced by temperature, time duration of voltage pulse, and magnitude of reverse voltage. The time integrated overshoot intensity of EL scales as a power law with the pulse length. We attribute the overshoot effect to (i) the accumulation of holes on the interface formed by a polymer and a thin insulating layer of aluminum oxide next to the aluminum cathode under application of positive bias and (ii) the drift of holes back to the anode when the external field is being reversed and recombination with electrons in the bulk of the material. It turns out that the surface roughness of the Al2O3 layer is important for the recombination kinetics under reverse bias. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1412581
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  • 10
    Digitale Medien
    Digitale Medien
    An analytic model of electroluminescence in bilayer organic light emitting diodes with Ohmic injection of charge carriers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1823-1826 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A simple analytic model for the electroluminescence (EL) intensity and the total cell current in bilayer light-emitting diodes (LEDs) with Ohmic contacts is presented. Results are in good agreement with both existing experimental data and numerical simulations. This model permits the semiquantitative analyses of the influence of the most important parameters on the EL and cell currents. In particular, dependence of EL current on the ratio of electron to hole mobilities and on the LED geometry is analyzed. The predictions of the model are compared with analogous results for LEDs with barrier-limited injection of electrons. It is shown that the values of EL currents can be comparable. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1333028
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