Identification of the components of the electroluminescence spectrum of PE excited in uniform fields

Teyssèdre, G.; Cissé, Lamine; Mary, D.; Laurent, Christian

doi:10.1109/94.752004

Cited by 37 publications

(24 citation statements)

References 25 publications

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“…Because injection current can also excite surface plasmons on the electrode surface [21], and because these collective electronic excitations are able to decay radiatively, the only way to differentiate between the latter and EL from the dielectric is to avoid surface plasmons relaxation in the visible range (this can be done by using metal electrode other than gold -ITO (Indium-Tin Oxide) for example [22]). An alternative way is to analyze the emission spectrum in specific regions characteristic of the polymer and/or by filtering out the light from relaxation of surface plasmons [21]. Another interesting point coming from the modelling is the value of the injection current at peak maxima, which is of the order of 10 -1 A.m -2 .…”

Section: Discussionmentioning

confidence: 99%

Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform

Baudoin¹,

Mills²,

Lewin³

et al. 2011

J. Phys. D: Appl. Phys.

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A charge transport model allowing the description of electroluminescence in polyethylene films under AC stress is proposed. The fluid model incorporates bi-polar charge injection/extraction, transport and recombination. The physics is based on hopping-mobility of electronic carriers between traps with an exponential distribution in which trap-filling controls the mobility. The computation mesh is very tight close to the electrodes-of the order of 0.4 nm allowing mapping the density of positive and negative carriers during sinusoidal, triangular and square 50 Hz voltage waveforms. Experiment and simulation fit nicely and the time-dependence of the electroluminescence intensity is accounted for by the charge behaviour. Light emission scales with the injection current. It is shown that space charge affects a layer of 10 nm away from the electrode where the mobility is increased as compared to the bulk mobility due to the high density of charge. The approach is very encouraging and opens the way to model space charge under timevarying voltages.

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Section: Discussionmentioning

confidence: 99%

Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform

Baudoin¹,

Mills²,

Lewin³

et al. 2011

J. Phys. D: Appl. Phys.

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“…7 Spatial and time resolutions of the setup were 15 m and 40 s, respectively. 11,12 The response of the PM is flat in the range of 300-800 nm. The pulse generator ͑Five Lab Co. Ltd.͒ supplied a probing pulse of 5 ns duration, 200 V amplitude at a maximum frequency of 50 kHz.…”

Section: Materials and Techniquementioning

confidence: 99%

Millisecond time-range analysis of space-charge distribution and electroluminescence in insulating polymers under transient electric stress

Fukuma

Teyssèdre

Laurent

et al. 2005

Journal of Applied Physics

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ac aging and space-charge characteristics in low-density polyethylene polymeric insulation J. Appl. Phys. 97, 083713 (2005); 10.1063/1.1868880 Combined isothermal and nonisothermal dc measurements to analyze space-charge behavior in dielectric materials J. Appl. Phys. 97, 044103 (2005); 10.1063/1.1847703Space-charge-mediated delayed electroluminescence from polyfluorene thin filmsThe combined analysis of the space charge and electroluminescence ͑EL͒ in insulating polymers provides useful information on charge transport and energy dissipation. We are particularly interested in defining critical transport regimes leading to energy releases potentially harmful for the material. These critical regimes can be characterized by investigating the internal charge distribution when electroluminescence is detected. The dc case has been adequately covered: however, very few results are reported involving transient electric stress because its investigation needs a very fast space-charge detection setup. We have carried out such an analysis in the case of low-density polyethylene and polyethylene naphthalate ͑PEN͒ films by using fast acquisition techniques for both, the space-charge profile ͑resolution of 40 s in time and 15 m in depth͒ and the electroluminescence acquisition ͑250 s time resolution͒. The films were subjected to a voltage ramp up to a targeted level followed by a stabilization and a short circuit, the whole wave form lasting for 50 ms. Voltage rise rates from 300 to 3000 kV/ s and fields up to 200 kV/ mm were used as well as ac stress in a frequency range from 0.2 to 50 Hz. Mobile charges following the voltage application were in evidence in PEN. Two contributions have been distinguished in the EL excitation mechanisms: one is due to hot carrier impact processes driven by dV / dt, and the other is linked with recombination and controlled by the dc transport properties of the material.

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“…Spectral acquisition is therefore a difficult task, all the more than the spectrum of Fig.5 was acquired at low field (12kV/mm). Indium-Tin-Oxide electrodes were used in order to avoid the emission in the red due to the radiative decay of surface plasmons excited at the metallic electrodes (see [3,9]). …”

Section: B Ldpe and Xlpementioning

confidence: 99%

“…EL can sign reversible or irreversible electronic transitions (associated with physical and chemical reactions respectively) which has significance as regards electrical ageing and breakdown. It is therefore critical to be able to analyze the electroluminescence spectrum [3]. Up to now, we have used different forms of excitation to give a support for the EL spectra interpretation, being mild UV irradiation (featuring reversible transition), contact with a cold plasma (featuring chemical reaction and charge recombination-induced luminescence) [4] and chemiluminescence (featuring degradation by oxidative processes) [5].…”

Section: Introductionmentioning

confidence: 99%

Cathodo- and electro-luminescence spectra in insulating polymers: A parallel approach for inferring electrical ageing mechanisms

Teyssèdre

Franceschi

Laurent

2007

2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena

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Films of poly(ethylene naphthalate), polyethylene (either low density or cross-linked) and epoxy resins have been irradiated with electrons having kinetic energies of up to 10 keV, i.e. able to break bonds of the polymeric chains (featuring therefore hot electrons effects). The so-called cathodoluminescence spectrum has been acquired for different electron energies. With the various materials tested, we were able to reproduce the EL spectrum of these materials. These results allow to associate electroluminescence and electrical ageing in an implicit scheme, opening the way for defining safety limits in terms of electric stresses applied to a material for a given application.

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Identification of the components of the electroluminescence spectrum of PE excited in uniform fields

Cited by 37 publications

References 25 publications

Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform

Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform

Millisecond time-range analysis of space-charge distribution and electroluminescence in insulating polymers under transient electric stress

Cathodo- and electro-luminescence spectra in insulating polymers: A parallel approach for inferring electrical ageing mechanisms

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