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LED and OLED-based optic sensor array for colourimetric analysis
Dissertation (MEng (Microelectronic Engineering))--University of Pretoria, 2020.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613521537138688 |
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| access_status_str | Open Access |
| author2 | Joubert, Trudi-Heleen |
| author_browse | Joubert, Trudi-Heleen |
| author_facet | Joubert, Trudi-Heleen |
| collection | Thesis |
| dc_rights_str_mv | © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng (Microelectronic Engineering))--University of Pretoria, 2020. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/78978 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:28.126Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/78978 LED and OLED-based optic sensor array for colourimetric analysis Joubert, Trudi-Heleen u14007135@tuks.co.za Nell, Caylin Jade UCTD Colourimetric analysis inkjet printed electronics Light sensor optic sensor sensor array Dissertation (MEng (Microelectronic Engineering))--University of Pretoria, 2020. In this report, the development of flexible OLED-based (organic light-emitting diodes) light emitter and detector array is discussed for low-cost colourimetric analysis of water samples. LEDs have been used as optical sensors by measuring their discharge time, when exposed to different light intensities. This report investigates whether an LED emitter and detector array, with different colour LEDs and therefore wavelengths, can be used for colourimetric analysis (specifically a colourimetric pH test). This report also investigates whether flexible OLEDs can be used to create a similar light emission and detection array as the LED array. The flexibility and inkjet printability of OLEDs make it desirable for lab-on-chip, microfluidic, rapid diagnostic devices, which is agrowing field of research. Using OLEDs as light detectors is a novel concept; therefore OLED panels were characterized as light detecting devices in this report in terms of wavelength sensitivities, angular response, emission spectra, discharge time, photocurrent, capacitance, and resistance. These results were compared to the results of an LED, used as a light detector. A discrete model of the OLED was also simulated in SPICE software. The manufacturing of OLEDs was also investigated. Printed electronics is a growing additive manufacturing technique that is capable of printing small, low-cost, printed electronic devices on flexible substrates. Inkjet printed electronics is of special interest as there is little material wastage and high resolutions are attainable. Flexible OLEDs have been manufactured using a combination of screen printing, inkjet printing, and nano-printing techniques. In this report, an investigation was done on whether a fully inkjet printed OLED can be manufactured. A fully inkjet printable OLED structure was simulated, and the layers of the OLED structure and layer thicknesses were then optimized to maximize the number of photons that exit the device. NRF Carl and Emily Fuchs Institute for Micro-electronics (CEFIM) MEng (Microelectronic Engineering) Unrestricted 2021-03-10T06:24:59Z 2021-03-10T06:24:59Z 2021-04-19 2020 Dissertation * A2021 http://hdl.handle.net/2263/78978 en © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Colourimetric analysis inkjet printed electronics Light sensor optic sensor sensor array LED and OLED-based optic sensor array for colourimetric analysis |
| title | LED and OLED-based optic sensor array for colourimetric analysis |
| title_full | LED and OLED-based optic sensor array for colourimetric analysis |
| title_fullStr | LED and OLED-based optic sensor array for colourimetric analysis |
| title_full_unstemmed | LED and OLED-based optic sensor array for colourimetric analysis |
| title_short | LED and OLED-based optic sensor array for colourimetric analysis |
| title_sort | led and oled based optic sensor array for colourimetric analysis |
| topic | UCTD Colourimetric analysis inkjet printed electronics Light sensor optic sensor sensor array |
| url | http://hdl.handle.net/2263/78978 |