The University of Southampton
University of Southampton Institutional Repository

A Comparison between Electroluminescence Models and Experimental Results

A Comparison between Electroluminescence Models and Experimental Results
A Comparison between Electroluminescence Models and Experimental Results
Electrical insulation ages and degrades until its eventual failure under electrical stress. One cause of this relates to the movement and accumulation of charge within the insulation. The emission of a low level of light from polymeric materials while under electrical stressing occurs before the onset of currently detectable material degradation. This light is known as electroluminescence (EL) and under an ac electric field is thought to relate to the interaction of charge in close proximity to the electrode-polymer interface. Understanding the cause of this light emission gives a very high-resolution method of monitoring charge interaction and its influence on material ageing. A possible cause of this light emission is the bipolar charge recombination theory. This theory involves the injection, trapping and recombination of charge carriers during each half cycle of the applied field [1]. This work compares two models that to simulate the EL emission according to this bipolar charge recombination theory. Model 1 assumes a fixed space charge region and all injected charge is uniformly distributed in this region with charges able to either become trapped or to recombine with opposite polarity charge carriers [2]. This recombination relates directly the excitation needed for the emission of a photon of light as measured in experiments. Model 2 develops on this by accounting for the transport and extraction of charge with an exponential distribution of trap levels rather than a uniform distribution [3]. Figure 1 shows a good correlation between the two models and experimental data. The full paper will describe the models in more detail and present results comparing the simulated and experimental results under various applied waveforms. Model 1 and model 2 both provide a good correlation with experimental data but model 2 allows a greater understanding of the space charge profile in the region close to the electrodes as well as the shape of the conduction current. Further work involves developing these models to support changes in the charge trapping profiles due to material ageing and supporting simulated results with measured conduction current.
74
Mills, D H
833beedc-68ae-4c5b-8939-47c8644a53ba
Baudoin, F
fd324aa0-f23c-4346-b992-d8f9e1d00734
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Mills, D H
833beedc-68ae-4c5b-8939-47c8644a53ba
Baudoin, F
fd324aa0-f23c-4346-b992-d8f9e1d00734
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Mills, D H, Baudoin, F, Lewin, P L and Chen, G (2011) A Comparison between Electroluminescence Models and Experimental Results. UHVnet 2011, Winchester, United Kingdom. 18 - 19 Jan 2011. p. 74 .

Record type: Conference or Workshop Item (Poster)

Abstract

Electrical insulation ages and degrades until its eventual failure under electrical stress. One cause of this relates to the movement and accumulation of charge within the insulation. The emission of a low level of light from polymeric materials while under electrical stressing occurs before the onset of currently detectable material degradation. This light is known as electroluminescence (EL) and under an ac electric field is thought to relate to the interaction of charge in close proximity to the electrode-polymer interface. Understanding the cause of this light emission gives a very high-resolution method of monitoring charge interaction and its influence on material ageing. A possible cause of this light emission is the bipolar charge recombination theory. This theory involves the injection, trapping and recombination of charge carriers during each half cycle of the applied field [1]. This work compares two models that to simulate the EL emission according to this bipolar charge recombination theory. Model 1 assumes a fixed space charge region and all injected charge is uniformly distributed in this region with charges able to either become trapped or to recombine with opposite polarity charge carriers [2]. This recombination relates directly the excitation needed for the emission of a photon of light as measured in experiments. Model 2 develops on this by accounting for the transport and extraction of charge with an exponential distribution of trap levels rather than a uniform distribution [3]. Figure 1 shows a good correlation between the two models and experimental data. The full paper will describe the models in more detail and present results comparing the simulated and experimental results under various applied waveforms. Model 1 and model 2 both provide a good correlation with experimental data but model 2 allows a greater understanding of the space charge profile in the region close to the electrodes as well as the shape of the conduction current. Further work involves developing these models to support changes in the charge trapping profiles due to material ageing and supporting simulated results with measured conduction current.

Text
David_Mills_Paper_012.pdf - Version of Record
Download (184kB)
Slideshow
DHMills_UHVnet2011-_Poster.ppt - Other
Download (1MB)

More information

Published date: 18 January 2011
Additional Information: Event Dates: 18-19 January 2011
Venue - Dates: UHVnet 2011, Winchester, United Kingdom, 2011-01-18 - 2011-01-19
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 271866
URI: http://eprints.soton.ac.uk/id/eprint/271866
PURE UUID: b3ef99bb-51b4-4272-b0ef-c941086d70bf
ORCID for P L Lewin: ORCID iD orcid.org/0000-0002-3299-2556

Catalogue record

Date deposited: 04 Jan 2011 20:51
Last modified: 15 Mar 2024 02:43

Export record

Contributors

Author: D H Mills
Author: F Baudoin
Author: P L Lewin ORCID iD
Author: G Chen

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×