DC conductivity, optical properties and Judd-Ofelt evaluation of 20Li2O-xBi2O3-(78-x)TeO2-1Er2O3-1Ag mixed ionic-electronic glasses

被引:6
作者
Sutrisno, M. S. [1 ,3 ]
Sazali, E. S. [2 ]
Azlan, M. N. [4 ]
Kamil, S. A. [1 ]
Hisam, R. [1 ]
机构
[1] Univ Teknol MARA, Fac Appl Sci, Shah Alam 40450, Selangor, Malaysia
[2] Univ Teknol Malaysia, Fac Sci, Adv Opt Mat Res Grp, Johor Baharu 81310, Malaysia
[3] Univ Cyberjaya UoC, Persiaran Bestari, Cyber 11, Cyberjaya 63000, Selangor, Malaysia
[4] Univ Pendidikan Sultan Idris, Jabatan Fizik, Fak Sains dan Matemat, Tanjung Malim 35900, Perak, Malaysia
来源
MATERIALS TODAY COMMUNICATIONS | 2022年 / 31卷
关键词
Energy bandgap; Judd-Ofelt; Mixed ionic-electronic glass; DC conductivity; CONCENTRATION-DEPENDENT LUMINESCENCE; NON-BRIDGING OXYGEN; SPECTROSCOPIC PROPERTIES; TELLURITE GLASSES; UP-CONVERSION; OXIDE GLASS; SM3+ IONS; TRANSITION-PROBABILITIES; DIELECTRIC-PROPERTIES; INTENSITY PARAMETERS;
D O I
10.1016/j.mtcomm.2022.103525
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
20Li(2)O-xBi(2)O(3)-(78-x)TeO2-1Er(2)O(3)-1Ag glass system was prepared by melt quenching, and its DC conductivity, optical and spectroscopic properties were investigated. Its amorphous nature was confirmed by x-ray diffraction analysis. Results showed that DC conductivity sigma dc initially increased at x < 7 mol% and then decreased to a minimum at x = 11 mol% Bi2O3. UV-vis-NIR absorption spectra indicated six transition bands centered at 1496, 979, 799, 653, 544, and 521 nm corresponding to 4I13/2, 4I1(1/2), I-4(9/2), 4F(9/2), 4S(3/2), and 2H(11/2) Er3+ transitions, respectively. Analysis on optical absorption edge by Tauc's plot revealed maximum in direct E-i(iopt) (3.609 eV) and indirect optical energy bandgap E-d(iopt) (3.259 eV) at x = 11 mol%. Judd-Ofelt intensity parameter omega 2 was calculated from optical absorption data to describe the intensity of electron transitions within the 4 f shells of Er3+ ions in the glasses. A minimum omega 2 was obtained at x = 11 mol%. The minimum values of sigma dc and sigma(2) at x = 11 mol% are related to the presence of high bridging oxygen in the mixed ionic-electronic region that in-fluences the symmetry of surrounding Er3+ ions.
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页数:13
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