Synthesis and characterization of lithium tetraborate and lithium triborate phosphors doped with metals and their thermoluminescence properties

Download

index.pdf

Date

2016

Author

Çelik, Muzaffer Gençay

Metadata

Show full item record

Item Usage Stats

278
views

398
downloads

The phenomenon of thermoluminescence (TL) has been interested in the measurement of radiation dose over the past few decades. Thermoluminescence property of a material can be used in surface acoustic wave apparatus, sensor sector and non-linear optics (LASER). Moreover, in dosimetry TL concept has been utilized. Thermoluminescence dosimetry is interested in the fields of environmental, personnel, and clinical radiation applications. In this thesis, dosimetric phosphors lithium tetraborate (Li2B4O7: LTB) [1] and lithium triborate (LiB3O5: LBO) [2] which have been synthesized and doped with metals (Cu, Mn, Ag, Al, In, Eu) and thermoluminescence characteristics of synthesized lithium tetraborate (LTB) and lithium triborate (LBO) were analyzed. Un-doped and doped LTB samples were prepared with solution-assisted method (SAM) and microwave-assisted method (MAM). Synthesized LTB and LBO phosphors were characterized with X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), and Differential Thermal Analysis (DTA) to determine structural and morphological properties. Thermoluminescence (TL) properties of the LTB and LBO samples doped with various doping systems such as single dopant, double-dopant, and three dopant systems were studied. TL results demonstrated that 0.08% Cu and 0.04% Ag doped LTB synthesized with SAM has the highest dosimetric sensitivity among the LTB samples produced with SAM and MAM. According to TL results of LBO samples, 1% Al doped LBO sample gave the best TL properties in terms of peak shape and intensity among the synthesized LBO samples.

Subject Keywords

Lithium., Phosphors., Tetrabothriidae., Thermoluminescence.

URI

http://etd.lib.metu.edu.tr/upload/12620302/index.pdf
https://hdl.handle.net/11511/25848

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

An automated system for the analysis of variable temperature radioluminescence Poolton, N.R.J.; Bulur, Enver; Wallinga, J.; Botter-Jensen, L.; Murray, A.S.; WILLUMSEN, F (2001-01-01) Radioluminescence (RL, i.e. prompt luminescence emitted during exposure to ionizing radiation) is used for analysing luminescence emission processes and has been proposed as a method for determining received radiation doses in both natural and synthetic radiation dosimeters, We describe here an automated system capable of both multi-sample RL analysis and comparative studies using traditional thermoluminescence (TL) and optically stimulated luminescence (OSL) methods. The radioluminescence unit is intended ...
Characterization of trap centers in Gd2O3 nanoparticles by low temperature thermoluminescence measurements Delice, S.; IŞIK, MEHMET; Hasanlı, Nızamı (2018-01-01) Trapping centers in Gd2O3 nanoparticles were investigated using thermoluminescence (TL) measurements in the below room temperature region of 10-280 K. Seven peaks having peak maximum temperatures between 30 and 252 K were observed in the TL spectra measured at constant heating rate of 0.3 K/s. Activation energies, order of kinetics and frequency factors were reported using three different analysis techniques: curve fitting, initial rise and peak shape methods. Activation energies of the trapping centers wer...
Synthesis and thermoluminescence properties of rare earth oxides (Y, Ce-Lu) doped lithium triborate Yılmaz, Ayşen; Yılmaz, Ayşen (2011-06-01) Lithium triborate (LiB(3)O(5)) was synthesized by high temperature solid-state reaction method, and then rare earth oxides were doped into LiB(3)O(5) to enhance its thermoluminescent (TL) properties. The identification and characteristics of the obtained compounds were determined by X-ray diffraction (XRD), Fourier transform infrared (FTIR) analyses, differential thermal analyses (DTA) and scanning electron microscopy (SEM). The glow curves were obtained using a thermoluminescent (TL) reader. The results re...
Synthesis of New Flexible Coumarin Dimers for Sodium and Potassium Differentiation TAN, DUYGU; Akdağ, Akın (Springer Science and Business Media LLC, 2020-01-01) Using fluorescence to detect biologically relevant metals has been studied extensively due to its rapid and low detection limit ability. Sodium and potassium differentiation is significant in diagnosis of many medical conditions. For this, we designed coumarin dimers as flexible fluorescent probes using ethylene glycol units for differentiation of sodium and potassium. To our best knowledge, use of these easy-to-synthesize coumarin dimers linked through ethylene glycol units are first in the literature. In ...
Synthesis of Luminescent Borate Compounds and Multi Functional Mesoporous Silicates for Poor Water Soluble Drug’s Delivery Yılmaz, Ayşen (null; 2018-10-01) The luminescence properties of inorganic materials could be potentially employed for dosimetric purposes in the case of radiation accident or radiological terrorism where conventional monitoring has not been established. This work focuses on the thermo(TL) and cathodoluminescence (CL) emission of several biogenic materials including winkle shell (made of Ca-rich carbonates -calcite 90% and aragonite 10%-), kidney stones and gallbladder (Ca-rich oxalates –whewellite-) and bones (Ca-rich phosphates – hydroxya...

Citation Formats

M. G. Çelik, “Synthesis and characterization of lithium tetraborate and lithium triborate phosphors doped with metals and their thermoluminescence properties,” M.S. - Master of Science, Middle East Technical University, 2016.