Glasses doped with europium ions for use in optoelectronic devices: W-LED

Abstract

Using a melt quench process, phosphate glasses doped with europium have been synthesized with a specific chemical composition that makes them ideal for use in white LEDs. The samples are well-suited for optical applications due to their high refractive index and density. These glass materials demonstrate a high Hruby criteria value and excellent thermal stability. The bonding structures associated with P-O-Eu and P-O-P stretching and bending are identified based on their respective frequencies. Notable absorption peaks are detected at 361 nm, 376 nm, and 393 nm. From the emission spectra of the produced glass samples, the Judd-Ofelt parameters are obtained Ω 2, Ω 4, and Ω 6 are the intensity parameters for europium-doped phosphate glasses, in that order. The Ω 2 parameter is important because it shows the covalent interaction between europium ions and ligand anions, which is a result of the asymmetry of the local environment around the trivalent rare earth ions (Eu³⁺). Five different glass samples, designated as EuP 1 – EuP 5, were found to be acceptable for white LEDs based on the CIE plot, which shows that they generate white light when stimulated at 361 nm, 376 nm, and 393 nm. If light-emitting diode (LED) technology is to continue to advance, phosphate glasses doped with europium will play an increasingly important role in enhancing overall colour quality, efficiency and display flexibility. Their performance in transforming high-energy light into specific color visible light increases their value in the LED industry.