Europium-Doped Tellurite Glasses: The Eu2+ Emission in Tellurite, Adjusting Eu2+ and Eu3+ Emissions toward White Light Emission

Abstract

Europium-doped magnesium tellurite glasses were prepared using melt quenching techniques and attenuated total reflection (ATR) spectroscopy was used to study the glass structure. The glass transition temperature increased with increasing MgO content. Eu2+ and Eu3+ emissions were studied using photoluminescence spectroscopy (PL). The broad emission of Eu2+ ions centered at approximately 485 nm was found to decrease in intensity with increasing MgO content, while the Eu3+ emission was enhanced. The Eu3+ emission lay within the red orange range and its decay time was found to increase with increasing MgO content. Different excitation wavelengths were used to adjust Eu2+ to Eu3+ emissions to reach white light emission. The white light emission was obtained for the sample with the lowest MgO content under excitation in the near-UV range.

Comprehensive study on structural, optical, mechanical and radiation blocking nature of Eu3+-doped bismuth tellurite glasses

“…It is possible to upgrade the network properties of borotellurite glasses by using rare-earth (RE) oxides as dopants. Tellurite glasses are ideal hosts for RE oxides having widespread application in optical amplifiers due to transparency, low phonon energies, third-order nonlinear susceptibility, and high atomic number of tellurium (Barbosa et al 2021;Elkholy et al 2019;Elkholy 2002;Klimesz et al 2017;Vani et al 2021). Fabrication of glasses containing TeO 2 in our previous work resulted in improved transparency, along with increment in density values up to 5.087 gcm −3 (D'Souza et al 2023).…”

“…The MFP followed same pattern as HVL. Beer-Lambert's law is applicable for monochromatic rays, narrow beam geometry and thin shields (Elkholy et al 2019). When one of these conditions (for example, broad beam geometry) is violated, the law takes a modified form "I = BI 0 e −μx ."…”