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 ⁴E_g->⁴A_2g transition of Mn⁴⁺. To estimate the optical parameters, UV-Vis-IR absorption spectroscopies were measured. The red shift of the direct optical band gap E^opt_g, from 3.81 to 2.55 eV, was observed by increasing the Mn⁴⁺ concentration. The dispersion parameters, refraction indices (n, n_{бесконечность}), 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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Дата начала обработки статистических данных - 27 января 2016 г.