Details

Autor(en) / Beteiligte

• Said Mahraz, Zahra Ashur
• Sahar, M.R.
• Ghoshal, S.K.
• Reza Dousti, M.

Titel

Concentration dependent luminescence quenching of Er3+-doped zinc boro-tellurite glass

Ist Teil von

• Journal of luminescence, 2013-12, Vol.144, p.139-145

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Understanding the mechanism of luminescence quenching in rare earth doped tellurite glass is an important issue. The Er3+-doped boro-tellurite glasses with compositions 30B2O3+10ZnO+(60−x)TeO2+xEr2O3 (where x=0, 0.5, 1, 1.5 and 2mol%) were prepared by melt quenching method. Structural and optical properties of the proposed glasses were characterized using XRD, FTIR, density, UV–vis-IR absorption and PL spectroscopy. The amorphous nature of these glasses was confirmed by XRD technique. The IR-spectrum reveals five absorption bands assigned to different B–O and Te–O vibrational groups. UV–vis-IR absorption spectrum exhibits seven absorption bands at 6553, 10,244, 12,547, 15,360, 19,230, 20,661 and 22,522cm−1 corresponding to 4I13/2, 4I11/2, 4I9/2, 4F9/2, 2H11/2, 4F7/2 and 4F3/2 excited states of Er3+ ion respectively. The optical band gap energy (Eopt) corresponding to the direct and indirect allowed transitions decreased, while the Urbach energy and cut-off wavelengths are increased by the introduction of Er3+ ions. The refractive index, density and phonon cut-off edge of the samples are increased and the molar volume decreased with the further addition of dopants. The Judd–Ofelt parameter (Ω2) decreased from 5.73 to 3.13×10−20cm2 with the increase of erbium ions concentration from 0.5 to 2mol%. The PL spectra show green emissions for the transition from 2H11/2 and 4S3/2 excited states to 4I15/2 ground state, which show strong quenching due to the addition of Er3+ ions. •Er3+-doped zinc boro-tellurite glass has been synthesized by melt quench method.•Spectroscopic properties dependent concentration is analyzed by different techniques.•Judd–Ofelt intensity parameter (Ω2) decreased by increase in erbium ion content.•Strong quenching is observed in PL spectra due to the addition of Er3+ ions.•Addition of Er ion decreased the optical band gap and increased the Urbach energy.