Optical Absorption of Er³⁺/Nd³⁺ Co-Doped Tellurite Glass

Abstract

Tellurite glasses of varying Er3+/Nd3+ concentration were successfully prepared by melt-quenching method. The X-Ray diffraction pattern was determined by using Siemens Diffractometer D5000 while the optical properties were measured using Shimadzu 3101 pc UV-VIS NIR scanning spectrophotometer. It was found that the diffraction patterns of all samples showed glasses characteristics. The optical band gap, Eopt¬ increased proportionally with the content of Er¬2O3 but Urbach energy, ∆E decreased due to the increasing Er2O3 contents.

Optical Absorption of Er³⁺/Nd³⁺ Codoped Lithium Niobate Tellurite Glass

“…As a result, the Urbach energy for the glass system decreases from 0.31 eV to 0.21 eV but not in systematic manner. Therefore, with the decrease of E tail confirms that the number of defects also decreases, hence the glass obtained from the research are highly homogenous and stable [9][10][11]. This result is a good agreement with previous report which the addition of rare-earth to the oxide glass gives a reduction in optical band gaps as well as the Urbach energies with the densification of glass network where the lowest E tail was observed for S4 [7,10,12].…”

“…Therefore, with the decrease of E tail confirms that the number of defects also decreases, hence the glass obtained from the research are highly homogenous and stable [9][10][11]. This result is a good agreement with previous report which the addition of rare-earth to the oxide glass gives a reduction in optical band gaps as well as the Urbach energies with the densification of glass network where the lowest E tail was observed for S4 [7,10,12]. Moreover, it also indicates the absence of long range atomic arrangement and the periodicity of three dimensional networks in glassy materials [13].…”

Optical Absorption in Erbium Doped Phosphate Glass Embedded with Cobalt Nanoparticles

“…The principle of the study of absorption edge is based on the absorption of a photon with energy greater than the band gap energy. Optical transitions are involved in the interaction of an electromagnetic wave with an electron in the valence band [16]. The indirect optical band gap (E opt ) of the amorphous materials can be calculated by a fitting method of Tauc [17] model to ultraviolet region of absorption spectrum.…”

Optical Properties of Eu³⁺-Doped Lithium Tellurite Glass

“…5(a) displaying ln (α) versus hv plot is used to calculate the Urbach energy from the inverse slope. The linear region of the curve at lower photon energy is used following equation [19].…”