OPTICAL PROPERTIES OF HEAVY METAL GLASS DOPED WITH TB/EU IONS

Abstract

The Tb³⁺/Eu³⁺ doped glass with the composition of TeO₂ –B₂O₃ - ZnO – Na₂O – RE₂O₃ (RE=Tb, Eu) is a product resulting from the melt quenching method; the luminescence properties of the glass samples have been examined via excitation and emission spectra. The photoluminescence spectrum of the glass doped singly with Tb³⁺ ion when being excited at λ_exc=379 nm (⁷F₆→⁵G₆) showed a prominent green emission at 543 nm (⁵D₄→⁷F₅). The photoluminescence spectrum of the Eu³⁺ doped glass with an excitation at 394 nm (⁷F₀→⁵L₆) revealed a bright red emission at 612 nm (⁵D₀→⁷F₂). The glass sample containing Tb³⁺(1 mol%) co-doped with Eu³⁺ (1mol%) at an excitation of λ_exc=379 nm exhibited an energy transfer from Tb³⁺ to Eu³⁺ ions. This energy transfer process can be explained by means of a diagram showing energy levels.