EFFECT OF Mn4+ ON THE ABSORBANCE OF EUROPIUM DOPED MAGNESIUM BOROTELLURITE GLASS

Abstract

A series of europium oxide doped borotellurite glass containing Manganese Nanoparticles (Mn₃O₄ NPs) with composition of (59-x)TeO₂-30B₂O₃-10MgO-₁Eu₂O_{3 x}Mn₃O₄ (where x = 0.5, 1.0, 1.5 mol %) have been prepared by conventional melt quenching technique. The amorphous nature of glasses is confirmed by X-ray diffraction technique which shows a broad hump at lower 2θ angle. The physical properties glass such as glass density and molar volume are carried out. It is found that glass density and molar volume are in the range of (4.706-4.725) gcm-3 and (25.71-25.98) cm³mol^-1, respectively. Meanwhile, the absorption spectra reveals three prominent peaks located at 461 nm, 531 nm and 591 nm which are corresponding to the ⁷F₀ →⁵D₂, ⁷F₀ →⁵D₁ and ⁷F₁ →⁵D₀ transition, respectively. The absorption features in term of optical band gap (Eopt) and Urbach energy (∆E) are also investigated. It is obtained that the indirect band gap and Urbach energy are ranging from (2.87-3.27) eV and (0.275-0.519) eV, respectively. All the results will be discussed with respect to the modification of Mn₃O₄ NPs concentration.