Novel Eu3+ doped mixed alkaline-earth zinc silico-aluminate glass for white-light-emitting diode, fingerprint, and security ink application

Abstract

In this work, novel calcium strontium magnesium zinc silico-aluminate (CSrMZSAEux) glasses doped with varied concentrations of Eu2O3 (0.5, 1.0, 1.5, 2, 3, 4 and 5 mol%) were synthesized by an open-air melt quenching technique. The Raman and FTIR studies revealed that Eu3+ ions connected to both AlO4 and SiO4 units through non-bridging oxygen. The decrease in thermal stability from 158 to 141 °C with the gradual inclusion of Eu2O3 ions is showing modifier role of Eu3+ ions. The intense emission spectra (5D0→7Fi = 0-4 transitions) measured under 395 nm excitation wavelength, showed no concentration quenching within the studied dopant ions concentration. The high Judd-Ofelt parameter (Ω2 = 5.06 to 6.31 × 10−20 cm2) and red-to-orange emission intensity ratio (R = 3.627–4.102) have revealed the covalent nature of Eu-ligand bond and high color richness, respectively. Among all prepared glasses, the CSrMZSAEu5.0 glass showed high color purity (98.9%), correlated color temperature (<1000K), highest emission intensity and reasonable lifetime value (1387±16 μs). Further, the temperature-dependent photoluminescence demonstrated that the CSrMZSAEu5.0 glass has good emission thermal stability (⁓ 66% at 150 °C) with a high activation energy of 0.258 eV. Hence, the CSrMZSAEu5.0 glass can be used as red component for white-light-emitting diode, and red-light applications. Furthermore, the CSrMZSAEu5.0 glass composition is observed to be suitable for latent fingerprint and security ink applications.