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Modelling electroluminescence in insulating polymers under ac stress: effect of voltage offset and pre-stressing

Modelling electroluminescence in insulating polymers under ac stress: effect of voltage offset and pre-stressing
Modelling electroluminescence in insulating polymers under ac stress: effect of voltage offset and pre-stressing
Ac electroluminescence (EL) in polyethylene films is well documented on experimental grounds but a detailed model encompassing injection and transport is still to be strengthened. In particular, different papers report that the EL under ac sinusoidal voltage for both divergent and uniform field configurations is independent of a superimposed dc voltage offset, which is confirmed by our own measurements. Based on modelling, we show that the dc offset voltage induces a transient behaviour of the ac EL; where the symmetry between the EL peaks occurring during each half cycle of the ac voltage is broken but the same steady state is reached for any value of dc offset. The transient duration is short relative to the timescale of a typical EL measurement explaining why it has not been reported experimentally. It depends on the injection level, charge mobility and recombination efficiency. The model also explains the dependence of ac EL on the presence of homo-space charge near the electrodes.
condensed matter: electrical, magnetic and optical, semiconductors
0022-3727
1-11
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
Clain, S.
46c29caf-93cd-421f-bc5e-2f6e896d3a61
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
Clain, S.
46c29caf-93cd-421f-bc5e-2f6e896d3a61

Baudoin, F., Mills, D.H., Lewin, P.L., Le Roy, S., Teyssedre, G., Laurent, C. and Clain, S. (2012) Modelling electroluminescence in insulating polymers under ac stress: effect of voltage offset and pre-stressing. Journal of Physics D: Applied Physics, 45 (32), 1-11. (doi:10.1088/0022-3727/45/32/325303).

Record type: Article

Abstract

Ac electroluminescence (EL) in polyethylene films is well documented on experimental grounds but a detailed model encompassing injection and transport is still to be strengthened. In particular, different papers report that the EL under ac sinusoidal voltage for both divergent and uniform field configurations is independent of a superimposed dc voltage offset, which is confirmed by our own measurements. Based on modelling, we show that the dc offset voltage induces a transient behaviour of the ac EL; where the symmetry between the EL peaks occurring during each half cycle of the ac voltage is broken but the same steady state is reached for any value of dc offset. The transient duration is short relative to the timescale of a typical EL measurement explaining why it has not been reported experimentally. It depends on the injection level, charge mobility and recombination efficiency. The model also explains the dependence of ac EL on the presence of homo-space charge near the electrodes.

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More information

Published date: 30 July 2012
Keywords: condensed matter: electrical, magnetic and optical, semiconductors
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 341781
URI: https://eprints.soton.ac.uk/id/eprint/341781
ISSN: 0022-3727
PURE UUID: 79c86a83-efff-4ddb-af17-cd41e247be33

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Date deposited: 06 Aug 2012 13:12
Last modified: 19 Jul 2019 21:54

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