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Influence of Ageing on Space Charge and Electroluminescence of Epoxy Resin

Influence of Ageing on Space Charge and Electroluminescence of Epoxy Resin
Influence of Ageing on Space Charge and Electroluminescence of Epoxy Resin
The occurrence of light emission under high ac fields, known as electroluminescence (EL), is attributed to the interaction between mobile and trapped charges within the dielectric. Images of EL for 200 micron thick virgin and aged epoxy samples at different voltages were recorded using a CCD camera. The images were obtained by applying ac electric fields across the samples and exposing the CCD for 600s. The images were constructed from the read-out data using the same grey level for comparison. Images of the virgin and aged samples showed a difference in the emission with the virgin sample producing a more homogeneous emission compared with a rather inhomogeneous emission from the aged sample. Comparison of EL with field strength showed virgin samples having an intensity level around 3 times greater than aged samples at 6kV. The EL emission follows an exponential increase due to the greater injection of charge carriers into the material. The reduction in EL intensity may be related to molecular degradation of the resin causing a greater trapping of charge carriers at the interface and therefore a reduction in the electric field, resulting in less charge injection. This reduction in EL could be due to some chemical changes in samples that cause deep traps, which require a higher electric field for injection. Accordingly there is not much increase in the EL emission compared to the one seen in LDPE, for example. Also, the reduction in EL might be due to some physical changes in the surface which limit charge injection, due to an increase in shallow trapping sites once they become saturated.
978-1-4244-7492-9
88-91
Alghamdi, A S
6b43006d-b504-4a0a-a0c3-1ebc29e6e3a3
Mills, D H
833beedc-68ae-4c5b-8939-47c8644a53ba
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Alghamdi, A S
6b43006d-b504-4a0a-a0c3-1ebc29e6e3a3
Mills, D H
833beedc-68ae-4c5b-8939-47c8644a53ba
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Alghamdi, A S, Mills, D H and Lewin, P L (2010) Influence of Ageing on Space Charge and Electroluminescence of Epoxy Resin. 2010 IEEE International Conference on Solid Dielectrics, Germany. 04 - 09 Jul 2010. pp. 88-91 .

Record type: Conference or Workshop Item (Paper)

Abstract

The occurrence of light emission under high ac fields, known as electroluminescence (EL), is attributed to the interaction between mobile and trapped charges within the dielectric. Images of EL for 200 micron thick virgin and aged epoxy samples at different voltages were recorded using a CCD camera. The images were obtained by applying ac electric fields across the samples and exposing the CCD for 600s. The images were constructed from the read-out data using the same grey level for comparison. Images of the virgin and aged samples showed a difference in the emission with the virgin sample producing a more homogeneous emission compared with a rather inhomogeneous emission from the aged sample. Comparison of EL with field strength showed virgin samples having an intensity level around 3 times greater than aged samples at 6kV. The EL emission follows an exponential increase due to the greater injection of charge carriers into the material. The reduction in EL intensity may be related to molecular degradation of the resin causing a greater trapping of charge carriers at the interface and therefore a reduction in the electric field, resulting in less charge injection. This reduction in EL could be due to some chemical changes in samples that cause deep traps, which require a higher electric field for injection. Accordingly there is not much increase in the EL emission compared to the one seen in LDPE, for example. Also, the reduction in EL might be due to some physical changes in the surface which limit charge injection, due to an increase in shallow trapping sites once they become saturated.

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More information

Published date: 4 July 2010
Additional Information: Event Dates: 4 - 9 July 2010
Venue - Dates: 2010 IEEE International Conference on Solid Dielectrics, Germany, 2010-07-04 - 2010-07-09
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 271357
URI: https://eprints.soton.ac.uk/id/eprint/271357
ISBN: 978-1-4244-7492-9
PURE UUID: 9f7c1fd0-b0e2-4f46-bc9b-8cb7d5cbe362

Catalogue record

Date deposited: 07 Jul 2010 11:59
Last modified: 18 Jul 2017 06:43

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