Phonon Sideband and Intensity Parameter Analysis of Eu3+/Tb3+-Doped Zinc Sodium Borotellurite Glasses for Multicolor Emission

A spectroscopic study of Eu3+, Tb3+ and Eu3+/Tb3+ ions-doped zinc sodium borotellurite (ZNB) glass synthesized by a melt-quenching method was performed via photoluminescence spectra and luminescence decay. The results of X-ray diffraction showed the amorphous materials of the prepared glass, and also indicated the difference in absorption spectra between glass samples doped by Eu3+ and Tb3+ ions. Three phonon energies of the ZNB host lattice were found around 932 cm(-1), 1282 cm(-1) , and 1892 cm(-1) through the excitation spectra of Eu3+ and Tb3+ ions. The multiphonon relaxation rate (W-mp) was estimated for each phonon sideband and compared with previously reported results. Intensity parameters (& omega;(& lambda;)) were determined by the Judd-Ofelt theory and their values were used to evaluate the radiative transition of Eu3+ ions in ZNB glass, such as calculated lifetime (& tau;(cal)), transition probability rate (A), effective line width (& UDelta;& lambda;(eff)), stimulated emission cross-section (& sigma;(p)), and branching ratio (& beta;(R)). Eu3+/Tb3+ co-doped in ZNB glass exhibited multicolor emissions and the energy transfer process between Tb3+ and Eu3+ ions was confirmed based on the analysis of excitation spectra and decay time.

Automated summary

A spectroscopic study was conducted on zinc sodium borotellurite (ZNB) glass doped with Eu3+, Tb3+, and Eu3+/Tb3+ ions synthesized through a melt-quenching method. The X-ray diffraction results showed that the glass prepared was amorphous, and there were differences in absorption spectra between Eu3+-doped and Tb3+-doped glass samples. Excitation spectra of Eu3+ and Tb3+ ions revealed three phonon energies of the ZNB host lattice. Intensity parameters were calculated using the Judd-Ofelt theory and used to evaluate the radiative transition of Eu3+ ions in ZNB glass, including lifetime, transition probability rate, effective line width, stimulated emission cross-section, and branching ratio. The co-doping of Eu3+ and Tb3+ ions in ZNB glass resulted in multicolor emissions and confirmed the energy transfer process between Tb3+ and Eu3+ ions.