Time-resolved photoluminescence studies in Eu-doped SiO2 – HfO2 – ZnO glass-ceramic waveguides. Issue 1 (January 2017)

• Record Type: Journal Article
• Authors: Ghosh, Subhabrata; Valligatla, Sreeramulu; Lukowiak, Anna; Chiasera, Alessandro; Ferrari, Maurizio; Shivakiran Bhaktha, B.N.
• Is Part Of: Ceramics international. Volume 43:Issue 1(2017)Part B
• Page Start: 1145
• Page End: 1149
• Publication Date: 2017-01
• Subjects: Glass-ceramics -- Waveguides -- Rare earth -- Time resolved PL; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.10.055
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Fabrication of ZnO-HfO2 hybrid nanocrystals embedded 70 SiO2 -(30− x ) HfO2 - x ZnO ( x =0, 2, 5, 7 and 10 mol%) ternary glass-ceramic planar waveguides doped with 1 mol% Eu-ions, by sol-gel process and dip-coating technique has been reported. The effect of varying ZnO concentration on the growth and structural evolution of ZnO-HfO2 hybrid nanocrystals were investigated using transmission electron microscopy and other spectroscopic tools. Time-resolved PL measurements were performed to estimate the PL emission lifetimes of Eu 2+ and Eu 3+, present in two different local environments in the ternary matrix, as a function of ZnO concentration. Eu 3+ ions exhibit double exponential decay profile for the D 0 5 → F 2 7 emission, while the decay curves of Eu 2+ ions are single exponential. The variations in the PL emission decay profiles are used as a probe to investigate the changes in the local environments of the rare-earth ions in the glass-ceramic waveguides.