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

Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform
Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform
A charge transport model allowing the description of electroluminescence in polyethylene films under ac stress is proposed. The fluid model incorporates bipolar 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 of the density of positive and negative carriers during sinusoidal, triangular and square 50Hz 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 10 nm away from the electrode where the mobility is increased as compared with the bulk mobility due to the high density of charge. The approach is very encouraging and opens the way to model space charge under time-varying voltages.
0022-3727
165402
Baudoin, F.
48d4e11d-040c-4cf2-b305-1704492e77d7
Mills, D.H.
b408e6f4-fe0f-41a7-80c9-1c9a4ab2a2b9
Lewin, P.L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Le Roy, S.
8b4166d7-ca86-4416-9dfe-f8c56204c3b9
Teyssedre, G.
6ea78ba6-7846-4894-8f6f-373d7c5bccd9
Laurent, C.
284a4aa2-fdf2-4ca6-b467-8329da872556
Baudoin, F.
48d4e11d-040c-4cf2-b305-1704492e77d7
Mills, D.H.
b408e6f4-fe0f-41a7-80c9-1c9a4ab2a2b9
Lewin, P.L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Le Roy, S.
8b4166d7-ca86-4416-9dfe-f8c56204c3b9
Teyssedre, G.
6ea78ba6-7846-4894-8f6f-373d7c5bccd9
Laurent, C.
284a4aa2-fdf2-4ca6-b467-8329da872556

Baudoin, F., Mills, D.H., Lewin, P.L., Le Roy, S., Teyssedre, G. and Laurent, C. (2011) Modeling electroluminescence in insulating polymers under ac stress: effect of excitation waveform. Journal of Physics D: Applied Physics, 44 (16), 165402. (doi:10.1088/0022-3727/44/16/165402).

Record type: Article

Abstract

A charge transport model allowing the description of electroluminescence in polyethylene films under ac stress is proposed. The fluid model incorporates bipolar 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 of the density of positive and negative carriers during sinusoidal, triangular and square 50Hz 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 10 nm away from the electrode where the mobility is increased as compared with the bulk mobility due to the high density of charge. The approach is very encouraging and opens the way to model space charge under time-varying voltages.

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Published date: 6 April 2011
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 272163
URI: https://eprints.soton.ac.uk/id/eprint/272163
ISSN: 0022-3727
PURE UUID: 43213ecb-a115-403c-8504-fae7c08a1f11

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Date deposited: 07 Apr 2011 21:02
Last modified: 26 Aug 2017 16:31

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Contributors

Author: F. Baudoin
Author: D.H. Mills
Author: P.L. Lewin
Author: S. Le Roy
Author: G. Teyssedre
Author: C. Laurent

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