Вышедшие номера
Structure Analysis, Photoluminescence, and Non-linear/Linear Optical Parameters of Li2Ge4O9 : Mn4+ Transparent Glass-Ceramic
Morad I.1,2, Liu X.3, Elhosiny Ali H.4,5, El-Desoky M.M.2, Qiu J.1
1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China
2Department of Physics, Faculty of Science, Suez University, Suez, Egypt
3School of Materials Science and Engineering, Zhejiang University, Hangzhou, China
4Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, P.O. Box, Saudi Arabia
5Department of Physics, Faculty of Science, Zagazig University, Zagazig, Egypt
Email: hithamph@gmail.com
Поступила в редакцию: 18 января 2022 г.
Выставление онлайн: 29 марта 2022 г.

In this study, Li2Ge4O9 : Mn4+ transparent glass-ceramic was prepared by conventional melt-quenching. The thermal treatment was used for the devitrification of the sample. The creation of a Li2Ge4O9 nanocrystalline precipitated through the glass matrix was verified by X-ray diffraction and HR-TEM. Electron paramagnetic resonance spectra were employed to confirm the oxidation of Mn2+ to Mn4+ in glass-ceramic after thermal treatment. The photoluminescence spectra displayed a narrow red band centered at 668 nm ascribed to the spin-forbidden 4Eg->4A2g transition of Mn4+. To estimate the optical parameters, UV-Vis-IR absorption spectroscopies were measured. The red shift of the direct optical band gap Eoptg, from 3.81 to 2.55 eV, was observed by increasing the Mn4+ concentration. The dispersion parameters, refraction indices (n, nбесконечность), and oscillator wavelength (λ0) were examined by using Wemple-DiDomenico single-oscillator model. The relationship between the refractive index and the energy gap has been investigated using various models such as Moss, Herve-Vandamme, Ravindra, and Singh-Kumar. In addition, the linear and non-linear optical properties of Li2Ge4O9 : Mn4+ were mentioned. The temperature-dependent luminescence intensity measurement was also carried out. The method of preparation exposed herein for the synthesis of Mn4+-doped GCs might be prevailing to produce identical luminescent ceramics in accordance with the glass's devitrification. Keywords: glass-ceramics, photoluminescence, optical properties, non-linear/linear optical, dispersion parameters, energy gap

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