Time-resolved photoluminescence studies in Eu-doped SiO 2 – HfO 2 – ZnO glass-ceramic waveguides
| Autor: | Maurizio Ferrari, Subhabrata Ghosh, Anna Lukowiak, Alessandro Chiasera, B N Shivakiran Bhaktha, Sreeramulu Valligatla |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Fabrication Materials science Analytical chemistry 02 engineering and technology 01 natural sciences law.invention Ion Optics law Rare earth 0103 physical sciences Materials Chemistry Glass-ceramics 010302 applied physics Glass-ceramic business.industry Process Chemistry and Technology Doping 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nanocrystal time resolved PL Transmission electron microscopy Ceramics and Composites 0210 nano-technology Ternary operation business Waveguides |
| Zdroj: | Ceramics international 43 (2017): 1145–1149. doi:10.1016/j.ceramint.2016.10.055 info:cnr-pdr/source/autori:Subhabrata Ghosh, Sreeramulu Valligatla, Anna Lukowiak, Alessandro Chiasera, Maurizio Ferrari, B.N. Shivakiran Bhaktha/titolo:Time-resolved photoluminescence studies in Eu-doped SiO2-HfO2-ZnO glass-ceramic waveguides/doi:10.1016%2Fj.ceramint.2016.10.055/rivista:Ceramics international/anno:2017/pagina_da:1145/pagina_a:1149/intervallo_pagine:1145–1149/volume:43 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2016.10.055 |
| Popis: | Fabrication of ZnO-HfO2 hybrid nanocrystals embedded 70 SiO2-(30−x) HfO2-xZnO (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 Eu2+ and Eu3+, present in two different local environments in the ternary matrix, as a function of ZnO concentration. Eu3+ ions exhibit double exponential decay profile for the D 0 5 → F 2 7 emission, while the decay curves of Eu2+ 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. |
| Databáze: | OpenAIRE |
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