Spectroscopic properties of ebium doped tellurite glass

Er3+ doped tellurite glasses of composition (75-x)TeO2-25ZnO-5Na2O-xEr2O3 with x = 0, 0.2, 0.4, 0.7, 0.9, 1.1 and 1.4 mol% were successfully prepared by melt quenching technique. No definite peaks were found from the X-ray diffraction pattern, thus verified the amorphous nature of glass. However, th...

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Main Author:	Ismail, Siti Fatimah
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/48902/1/SitiFatimahIsmailMFS2014.pdf
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spelling	my-utm-ep.489022020-07-05T07:56:58Z Spectroscopic properties of ebium doped tellurite glass 2014-01 Ismail, Siti Fatimah QC Physics Er3+ doped tellurite glasses of composition (75-x)TeO2-25ZnO-5Na2O-xEr2O3 with x = 0, 0.2, 0.4, 0.7, 0.9, 1.1 and 1.4 mol% were successfully prepared by melt quenching technique. No definite peaks were found from the X-ray diffraction pattern, thus verified the amorphous nature of glass. However, the X-ray diffraction pattern for heat treated glass showed a wide peak which indicated the occurrence of nanocrystallite particle in the sample. The crystallite size was determined by Scherrer equation and confirmed by the image obtained from transmission electron microscopy technique. The vibrational study was conducted using Fourier transform infrared (FTIR) spectroscopy in the range of 4000 cm-1 – 400 cm-1. It was observed that, four absorption peaks occur around 1600 cm-1 – 3400 cm-1, 666 cm-1 – 755 cm-1, 546 cm-1 – 684 cm-1 and 465 cm-1 which were due to the stretching mode vibration of OH bond, TeO4 trigonal bipyramids and TeO3 trigonal pyramids, Er-O bond and Zn-O tetrahedral bond, respectively. The FTIR spectra for heat treated samples generated a higher intensity absorption band located at 564 cm-1, 573 cm-1, 669 cm-1 and 688 cm-1. The thermal stability of the glass was investigated using differential thermal analyzer. The thermal parameters, such as the glass transition temperature (Tg), crystalline temperature (Tc), melting temperature (Tm) and thermal stability (Tc-Tg) were determined. It was found that, this glass system has glass formation range around 51.47oC - 99.35oC. The emission spectrum was recorded using photoluminescence spectrometer at room temperature. From the luminescence spectra, blue and green emission bands associated with Er3+ transition at (382 nm) 4G11/2?4I15/2, (465 nm) 4F5/2?4I15/2, (501 nm) 2H11/2?4I15/2 and (550 nm) 4S3/2?4I15/2 with an excitation wavelength ?exci = 786 nm were observed. Meanwhile, the luminescence intensity for heat treated samples was slightly higher. The absorption characteristic was determined using ultra violet-visible spectroscopy. It was observed that, the optical band gap (Eg) and the Urbach energy (?E) was in the range 2.89 eV - 2.18 eV and 0.59 eV - 0.15 eV, respectively depending on the Er2O3 concentration. For the heat treated samples, the optical band gap (Eg) and the Urbach energy (?E) was in the range of 2.72 eV - 2.68 eV and 0.54 eV - 0.21 eV, respectively. 2014-01 Thesis http://eprints.utm.my/id/eprint/48902/ http://eprints.utm.my/id/eprint/48902/1/SitiFatimahIsmailMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:86748 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Ismail, Siti Fatimah Spectroscopic properties of ebium doped tellurite glass
description	Er3+ doped tellurite glasses of composition (75-x)TeO2-25ZnO-5Na2O-xEr2O3 with x = 0, 0.2, 0.4, 0.7, 0.9, 1.1 and 1.4 mol% were successfully prepared by melt quenching technique. No definite peaks were found from the X-ray diffraction pattern, thus verified the amorphous nature of glass. However, the X-ray diffraction pattern for heat treated glass showed a wide peak which indicated the occurrence of nanocrystallite particle in the sample. The crystallite size was determined by Scherrer equation and confirmed by the image obtained from transmission electron microscopy technique. The vibrational study was conducted using Fourier transform infrared (FTIR) spectroscopy in the range of 4000 cm-1 – 400 cm-1. It was observed that, four absorption peaks occur around 1600 cm-1 – 3400 cm-1, 666 cm-1 – 755 cm-1, 546 cm-1 – 684 cm-1 and 465 cm-1 which were due to the stretching mode vibration of OH bond, TeO4 trigonal bipyramids and TeO3 trigonal pyramids, Er-O bond and Zn-O tetrahedral bond, respectively. The FTIR spectra for heat treated samples generated a higher intensity absorption band located at 564 cm-1, 573 cm-1, 669 cm-1 and 688 cm-1. The thermal stability of the glass was investigated using differential thermal analyzer. The thermal parameters, such as the glass transition temperature (Tg), crystalline temperature (Tc), melting temperature (Tm) and thermal stability (Tc-Tg) were determined. It was found that, this glass system has glass formation range around 51.47oC - 99.35oC. The emission spectrum was recorded using photoluminescence spectrometer at room temperature. From the luminescence spectra, blue and green emission bands associated with Er3+ transition at (382 nm) 4G11/2?4I15/2, (465 nm) 4F5/2?4I15/2, (501 nm) 2H11/2?4I15/2 and (550 nm) 4S3/2?4I15/2 with an excitation wavelength ?exci = 786 nm were observed. Meanwhile, the luminescence intensity for heat treated samples was slightly higher. The absorption characteristic was determined using ultra violet-visible spectroscopy. It was observed that, the optical band gap (Eg) and the Urbach energy (?E) was in the range 2.89 eV - 2.18 eV and 0.59 eV - 0.15 eV, respectively depending on the Er2O3 concentration. For the heat treated samples, the optical band gap (Eg) and the Urbach energy (?E) was in the range of 2.72 eV - 2.68 eV and 0.54 eV - 0.21 eV, respectively.
format	Thesis
qualification_level	Master's degree
author	Ismail, Siti Fatimah
author_facet	Ismail, Siti Fatimah
author_sort	Ismail, Siti Fatimah
title	Spectroscopic properties of ebium doped tellurite glass
title_short	Spectroscopic properties of ebium doped tellurite glass
title_full	Spectroscopic properties of ebium doped tellurite glass
title_fullStr	Spectroscopic properties of ebium doped tellurite glass
title_full_unstemmed	Spectroscopic properties of ebium doped tellurite glass
title_sort	spectroscopic properties of ebium doped tellurite glass
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/48902/1/SitiFatimahIsmailMFS2014.pdf
_version_	1747817499682930688

Spectroscopic properties of ebium doped tellurite glass

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