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Phase Resolved Electroluminescence Measurements in Thin Films of Low Density Polyethylene Using a Charge Coupled Device Camera

Phase Resolved Electroluminescence Measurements in Thin Films of Low Density Polyethylene Using a Charge Coupled Device Camera
Phase Resolved Electroluminescence Measurements in Thin Films of Low Density Polyethylene Using a Charge Coupled Device Camera
Electroluminescence (EL) produced by a commercially available additive free low density polyethylene film has been investigated under a 50Hz ac electrical stress. The spatial distribution, spectral characteristics and the phase angle relationship of EL with respect to the 50Hz applied ac voltage were studied using a sensitive Peltier cooled charge-couple device (CCD) camera. The experimental results from several test samples show that the EL can be divided into two different groups according to the EL spatial distribution: (1) homogeneous EL and (2) inhomogeneous EL. At the same applied voltage, the spectra of the homogenous and inhomogeneous EL were found to be significantly different. Homogeneous EL had a maximum emission intensity in the red and near infra-red (>700nm), whereas the inhomogeneous emission had maximum intensity at shorter wavelengths (550nm – 600nm). Phase resolved measurements showed that homogeneous EL always produced equal emission intensity in the positive and negative half-cycles (symmetric distribution), whereas, inhomogeneous EL produced an asymmetric intensity distribution. To explain these results, it is suggested that homogeneous emission is associated with charge injection and bipolar recombination in the surface states on both sides of the sample, whereas inhomogeneous emission is associated with field enhancement at defects on one of the two sides of the film which allow charge to be injected into states more representative of the bulk material.
1070-9878
168-180
Dodd, S J
13f7eab0-eb74-4e89-83c6-555480aba185
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Wong, K I
40fbd353-4851-4aff-a0e0-beb239dec86f
Dodd, S J
13f7eab0-eb74-4e89-83c6-555480aba185
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Wong, K I
40fbd353-4851-4aff-a0e0-beb239dec86f

Dodd, S J, Lewin, P L and Wong, K I (2006) Phase Resolved Electroluminescence Measurements in Thin Films of Low Density Polyethylene Using a Charge Coupled Device Camera. IEEE Transactions on Dielectrics & Electrical Insulation, 13 (1), 168-180.

Record type: Article

Abstract

Electroluminescence (EL) produced by a commercially available additive free low density polyethylene film has been investigated under a 50Hz ac electrical stress. The spatial distribution, spectral characteristics and the phase angle relationship of EL with respect to the 50Hz applied ac voltage were studied using a sensitive Peltier cooled charge-couple device (CCD) camera. The experimental results from several test samples show that the EL can be divided into two different groups according to the EL spatial distribution: (1) homogeneous EL and (2) inhomogeneous EL. At the same applied voltage, the spectra of the homogenous and inhomogeneous EL were found to be significantly different. Homogeneous EL had a maximum emission intensity in the red and near infra-red (>700nm), whereas the inhomogeneous emission had maximum intensity at shorter wavelengths (550nm – 600nm). Phase resolved measurements showed that homogeneous EL always produced equal emission intensity in the positive and negative half-cycles (symmetric distribution), whereas, inhomogeneous EL produced an asymmetric intensity distribution. To explain these results, it is suggested that homogeneous emission is associated with charge injection and bipolar recombination in the surface states on both sides of the sample, whereas inhomogeneous emission is associated with field enhancement at defects on one of the two sides of the film which allow charge to be injected into states more representative of the bulk material.

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Published date: February 2006
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 261964
URI: http://eprints.soton.ac.uk/id/eprint/261964
ISSN: 1070-9878
PURE UUID: 520f9731-ac5a-44ff-a5b0-84b72fcaa786
ORCID for P L Lewin: ORCID iD orcid.org/0000-0002-3299-2556

Catalogue record

Date deposited: 13 Feb 2006
Last modified: 03 Dec 2021 02:34

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Contributors

Author: S J Dodd
Author: P L Lewin ORCID iD
Author: K I Wong

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