A study on optical, spectroscopic and structural properties of copper-doped calcium lithium borate glasses
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RESEARCH ARTICLE
A study on optical, spectroscopic and structural properties of copper-doped calcium lithium borate glasses Ismail Rammadhan Mohammed1
Received: 25 May 2020 / Accepted: 31 July 2020 Ó The Optical Society of India 2020
Abstract In this work, the physical properties of calcium lithium borate glasses are investigated upon the inclusion of Cu?2 ion dopant. UV–Vis–NIR, photoluminescence, FTIR, and XRD techniques were, respectively, used in this study. From the optical absorption response of the samples, direct and indirect energy band gaps were calculated and they were found to be in the ranges of 3.57–3.28 eV and 3.78–3.6 eV, respectively. Results showed that the refractive index was increased from 2.258 to 2.326 with the increase in Cu2O concentration. Also, three main emission bands were observed in the luminescence spectra at around 399, 483, and 575 nm, which are correlated with the change in the copper concentration. Results of the FTIR spectroscopy showed various peaks in the ranges of 1383–1415 cm-1 and 1062–1076 cm-1, which can be attributed to the trigonal and tetrahedral stretching vibrations of BO3 and BO4 units. Keyword Optical properties FTIR Photoluminescence Copper impurities Physical properties
Introduction In recent years, glasses doped with transition metal ions have attracted a great deal of attention due to their unique properties such as hardness, good strength, transparency, excellent corrosion resistance, and photoconducting properties [1]. The properties of glasses are mainly determined & Ismail Rammadhan Mohammed [email protected] 1
Department of Physics, Faculty of Sciences and Health, Koya University, Koya KOY45, Erbil, Kurdistan Region, Iraq
by the degree of local order/disorder, through which information about the local structure can be retrieved. UV– VIS and FTIR spectroscopies are very useful to provide valuable information related to the local symmetry, nature of chemical bonds and other structural properties of glasses [2]. Boric oxide is one of the most common glass-forming oxides and has been incorporated with various types of modifier metal oxide to attain the desired physical and chemical properties [3]. Boric oxide, B2O3 is generally interesting amorphous materials because of their structures and physical properties. In these glasses, two groups of bands are obtained: (a) due to trigonal BO3 units and (b) due to tetrahedral BO4 units. By the addition of transition metal ions to the borate glasses, they would show specific physical properties [4, 5]. Pure borate glasses are not of practical use because of their high hygroscopic nature and weak glow peak at low temperatures so they can be improved with the addition of alkali metals to get good physical properties. They are also studied as dosimetric materials which are ideal materials for the environment [6]. The transition metal-doped glasses are mainly used for applications in electrochemical, electronic, and optoelectronic devices. Optical absorption of some transition metal ions als
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