Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application

Light emission diodes (LEDs) are widely used in a variety of applications that are available today. With their tunability and long operation life-time, LEDs have surpassed the efficiency and functionality of conventional lighting systems like incandescent and luminescence light sources. Commercia...

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Main Author:	Abbas, Mohammed Fadil
Format:	Thesis
Language:	English
Published:	2019
Subjects:	Light emitting diodes - Research Dielectrics - Research Solid-state lasers - Thermal properties
Online Access:	http://psasir.upm.edu.my/id/eprint/77762/1/FK%202019%2062%20ir.pdf
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spelling	my-upm-ir.777622022-01-21T08:20:31Z Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application 2019-01 Abbas, Mohammed Fadil Light emission diodes (LEDs) are widely used in a variety of applications that are available today. With their tunability and long operation life-time, LEDs have surpassed the efficiency and functionality of conventional lighting systems like incandescent and luminescence light sources. Commercial LEDs are typically fabricated using a blue chip coated with yellow phosphor. However, this fabrication method lacks of a red-light component which induces poor thermal stability. A solution to this is to replace phosphors with glass. This work aims to fabricate glass hosts doped with rare earth (RE) elements for better thermal stability and lower power consumption. Firstly, the singly Dy3+-doped borate glasses with nominal composition (60-x) B2O3- 10 ZnO-10 PbO-10 Na2O-10 CaO-(x) Dy2O3 (x = 0, 0.1, 0.2, 0.5, 0.75, 1.0, 1.5 and 2.0 mol%) were prepared by using the melt quenching technique which were characterized using X-ray Diffraction (XRD) and Scanning electron microscope (SEM) to confirm the amorphous nature of the glasses and energy dispersive x-ray analysis (EDAX) to validate that all related elements were present in the synthesized glasses. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) measurements were also performed to study thermal properties, where ΔT >100 °C (ΔT=Tx – Tg) for all the glasses. Among all tested Dy3+-doped glasses, 0.75 mol% Dy3+-doped glass showed the highest photoluminescence (PL) intensity with four emissions, where the two transitions corresponded to 4F9/2→ 6H15/2 (blue) and 4F9/2→ 6H13/2 (yellow) were observed to be more intensified than the others. The Commission International de l'Eclairage (CIE) chromaticity (x,y) coordinates for BZPNCDy 0.1 mol% glass are (0.398, 0.430), close to the white light region in the CIE 1931 chromaticity diagram. The work was continued with fabricating singly doped Tb3+ and Sm3+ ions along with co-doped Tb3+/Sm3+ borate glasses via melt quenching technique. Both TGA and DSC analysis were conducted to explore the material’s thermal properties. Among all Tb3+/ Sm3+ co-doped glasses, the (Tb0.5-Sm0.5) glass shows the highest emission intensity with respect to others. A total of five emission bands were found, where two were from Tb3+ transitions corresponding to 488 nm (blue) (5D4 → 7F6) and 543 nm (green) (5D4 → 7F5). Three emission bands for Sm3+ at 563 nm (green), 599 nm (orange-red) and 645 nm (red) according to 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, and 4G5/2 → 6H9/2 electronic transitions have been identified. The calculated CIE chromaticity (x,y) coordinates for singly doped Tb3+ (Tb0.5) green emission, singly doped Sm3+ (Sm0.5) orange-red emission, and co-doped Tb3+/ Sm3+ (Tb0.5-Sm0.5) yellow emission are (0.343, 0.584), (0.607, 0.389), and (0.438, 0.515), respectively, following the CIE 1931 chromaticity diagram. Light emitting diodes - Research Dielectrics - Research Solid-state lasers - Thermal properties 2019-01 Thesis http://psasir.upm.edu.my/id/eprint/77762/ http://psasir.upm.edu.my/id/eprint/77762/1/FK%202019%2062%20ir.pdf text en public doctoral Universiti Putra Malaysia Light emitting diodes - Research Dielectrics - Research Solid-state lasers - Thermal properties Lakshminarayana, Gandham
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Lakshminarayana, Gandham
topic	Light emitting diodes - Research Dielectrics - Research Solid-state lasers - Thermal properties
spellingShingle	Light emitting diodes - Research Dielectrics - Research Solid-state lasers - Thermal properties Abbas, Mohammed Fadil Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
description	Light emission diodes (LEDs) are widely used in a variety of applications that are available today. With their tunability and long operation life-time, LEDs have surpassed the efficiency and functionality of conventional lighting systems like incandescent and luminescence light sources. Commercial LEDs are typically fabricated using a blue chip coated with yellow phosphor. However, this fabrication method lacks of a red-light component which induces poor thermal stability. A solution to this is to replace phosphors with glass. This work aims to fabricate glass hosts doped with rare earth (RE) elements for better thermal stability and lower power consumption. Firstly, the singly Dy3+-doped borate glasses with nominal composition (60-x) B2O3- 10 ZnO-10 PbO-10 Na2O-10 CaO-(x) Dy2O3 (x = 0, 0.1, 0.2, 0.5, 0.75, 1.0, 1.5 and 2.0 mol%) were prepared by using the melt quenching technique which were characterized using X-ray Diffraction (XRD) and Scanning electron microscope (SEM) to confirm the amorphous nature of the glasses and energy dispersive x-ray analysis (EDAX) to validate that all related elements were present in the synthesized glasses. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) measurements were also performed to study thermal properties, where ΔT >100 °C (ΔT=Tx – Tg) for all the glasses. Among all tested Dy3+-doped glasses, 0.75 mol% Dy3+-doped glass showed the highest photoluminescence (PL) intensity with four emissions, where the two transitions corresponded to 4F9/2→ 6H15/2 (blue) and 4F9/2→ 6H13/2 (yellow) were observed to be more intensified than the others. The Commission International de l'Eclairage (CIE) chromaticity (x,y) coordinates for BZPNCDy 0.1 mol% glass are (0.398, 0.430), close to the white light region in the CIE 1931 chromaticity diagram. The work was continued with fabricating singly doped Tb3+ and Sm3+ ions along with co-doped Tb3+/Sm3+ borate glasses via melt quenching technique. Both TGA and DSC analysis were conducted to explore the material’s thermal properties. Among all Tb3+/ Sm3+ co-doped glasses, the (Tb0.5-Sm0.5) glass shows the highest emission intensity with respect to others. A total of five emission bands were found, where two were from Tb3+ transitions corresponding to 488 nm (blue) (5D4 → 7F6) and 543 nm (green) (5D4 → 7F5). Three emission bands for Sm3+ at 563 nm (green), 599 nm (orange-red) and 645 nm (red) according to 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, and 4G5/2 → 6H9/2 electronic transitions have been identified. The calculated CIE chromaticity (x,y) coordinates for singly doped Tb3+ (Tb0.5) green emission, singly doped Sm3+ (Sm0.5) orange-red emission, and co-doped Tb3+/ Sm3+ (Tb0.5-Sm0.5) yellow emission are (0.343, 0.584), (0.607, 0.389), and (0.438, 0.515), respectively, following the CIE 1931 chromaticity diagram.
format	Thesis
qualification_level	Doctorate
author	Abbas, Mohammed Fadil
author_facet	Abbas, Mohammed Fadil
author_sort	Abbas, Mohammed Fadil
title	Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
title_short	Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
title_full	Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
title_fullStr	Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
title_full_unstemmed	Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
title_sort	structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application
granting_institution	Universiti Putra Malaysia
publishDate	2019
url	http://psasir.upm.edu.my/id/eprint/77762/1/FK%202019%2062%20ir.pdf
_version_	1747813257602662400

Structural, thermal, optical and dielectric studies on rare earth ion-doped borate glasses for solid state laser application

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