Staff View: Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy

Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy

Study has been made of the Photoluminescence properties of Ge-doped silica preforms fabricated using the MCVD process and subsequently subjected to γ-ray irradiation. The photoluminescence emissions pointed to the presence of defects related to oxygen vacancies. Two types of preform were fabricated,...

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Main Authors:	Siti Shafiqah, A.S., Sani, S.F. A., Tamchek, N., Almugren, K.S., Alkallas, F.H., Bradley, D.A. *
Format:	Article
Published:	Elsevier 2023
Subjects:	QC Physics TA Engineering (General). Civil engineering (General)
Online Access:	http://eprints.sunway.edu.my/2274/ https://doi.org/10.1016/j.radphyschem.2023.111014
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spelling	my.sunway.eprints.22742023-06-17T09:00:21Z http://eprints.sunway.edu.my/2274/ Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy Siti Shafiqah, A.S. Sani, S.F. A. Tamchek, N. Almugren, K.S. Alkallas, F.H. Bradley, D.A. * QC Physics TA Engineering (General). Civil engineering (General) Study has been made of the Photoluminescence properties of Ge-doped silica preforms fabricated using the MCVD process and subsequently subjected to γ-ray irradiation. The photoluminescence emissions pointed to the presence of defects related to oxygen vacancies. Two types of preform were fabricated, obtained using a different flow rate and deposition temperature for each case. Results from the absorption spectra of the samples named as P1 and P2, show a signature absorption peak at 5.1 eV and 6.8 eV, indicative of oxygen-deficient and oxygen-rich defects respectively. Photoluminescence investigation have been carried out before and after the irradiation process with both samples reveal two main peaks at 1.5 eV. The highest intensity at 1.5 eV is known as an interaction between the Non- Bridging Oxygen Hole Centre (NBHOC) with the presence of impurity in the glass matrix. Upon irradiation, weak peak can be observed at 1.8 eV, sample P1 and P2, the PL intensity increases by a factor of 20 × and 50 × , respectively. This peak is associated with the oxygen deficient state in the sample. The peak referring to defect known as Germanium Lone Pair Centre (GLPC) are observed in both samples, peak shown at 3.1 eV, regardless of the Germanium Oxygen Deficient Centre (GODC) content. In regard to this, it can be concluded that this defect is generated independently in all germanium samples and are not correlated with the GODC band observed in the absorption band. Elsevier 2023-09 Article PeerReviewed Siti Shafiqah, A.S. and Sani, S.F. A. and Tamchek, N. and Almugren, K.S. and Alkallas, F.H. and Bradley, D.A. * (2023) Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy. Radiation Physics and Chemistry, 210. ISSN 0969-806X https://doi.org/10.1016/j.radphyschem.2023.111014 10.1016/j.radphyschem.2023.111014
institution	Sunway University
building	Sunway Campus Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Sunway University
content_source	Sunway Institutional Repository
url_provider	http://eprints.sunway.edu.my/
topic	QC Physics TA Engineering (General). Civil engineering (General)
spellingShingle	QC Physics TA Engineering (General). Civil engineering (General) Siti Shafiqah, A.S. Sani, S.F. A. Tamchek, N. Almugren, K.S. Alkallas, F.H. Bradley, D.A. * Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy
description	Study has been made of the Photoluminescence properties of Ge-doped silica preforms fabricated using the MCVD process and subsequently subjected to γ-ray irradiation. The photoluminescence emissions pointed to the presence of defects related to oxygen vacancies. Two types of preform were fabricated, obtained using a different flow rate and deposition temperature for each case. Results from the absorption spectra of the samples named as P1 and P2, show a signature absorption peak at 5.1 eV and 6.8 eV, indicative of oxygen-deficient and oxygen-rich defects respectively. Photoluminescence investigation have been carried out before and after the irradiation process with both samples reveal two main peaks at 1.5 eV. The highest intensity at 1.5 eV is known as an interaction between the Non- Bridging Oxygen Hole Centre (NBHOC) with the presence of impurity in the glass matrix. Upon irradiation, weak peak can be observed at 1.8 eV, sample P1 and P2, the PL intensity increases by a factor of 20 × and 50 × , respectively. This peak is associated with the oxygen deficient state in the sample. The peak referring to defect known as Germanium Lone Pair Centre (GLPC) are observed in both samples, peak shown at 3.1 eV, regardless of the Germanium Oxygen Deficient Centre (GODC) content. In regard to this, it can be concluded that this defect is generated independently in all germanium samples and are not correlated with the GODC band observed in the absorption band.
format	Article
author	Siti Shafiqah, A.S. Sani, S.F. A. Tamchek, N. Almugren, K.S. Alkallas, F.H. Bradley, D.A. *
author_facet	Siti Shafiqah, A.S. Sani, S.F. A. Tamchek, N. Almugren, K.S. Alkallas, F.H. Bradley, D.A. *
author_sort	Siti Shafiqah, A.S.
title	Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy
title_short	Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy
title_full	Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy
title_fullStr	Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy
title_full_unstemmed	Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy
title_sort	defect characteristic of oxygen-deficient ge-doped preform using photoluminescence spectroscopy
publisher	Elsevier
publishDate	2023
url	http://eprints.sunway.edu.my/2274/ https://doi.org/10.1016/j.radphyschem.2023.111014
_version_	1769846269036986368
score	13.211869

Defect characteristic of oxygen-deficient Ge-doped preform using photoluminescence spectroscopy

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