Down conversion and efficient NIR to visible up-conversion emission analysis in Ho3+/Yb3+ co-doped tellurite glasses

A series of glasses with chemical composition (50−x−y) TeO2–30ZnO–10YF3–10NaF–xHo2O3–yYb2O3 (x=0.5 and y=0.5, 1.0, 3.0, 5.0mol%) were prepared by melt-quenching procedure. The absorption spectra, excitation, down conversion emission spectra, up-conversion (UC) emission spectra and decay time measure...

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Bibliographic Details
Published in:Boletín de la Sociedad Española de Cerámica y Vidrio (1983) 2023-07, Vol.62 (4), p.379-386
Main Authors: Kaniyarakkal, Sharafudeen, Culala Rajasekharaudayar, Kesavulu, Dagupati, Rajesh, Li, Yang, Chen, Zhi, Nair, Vijayakumar Sadasivan, Edappadikkunnummal, Shiju
Format: Article
Language:English
Subjects:
NIR light
Rare earth
Synthesis
Up-conversion
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Summary:A series of glasses with chemical composition (50−x−y) TeO2–30ZnO–10YF3–10NaF–xHo2O3–yYb2O3 (x=0.5 and y=0.5, 1.0, 3.0, 5.0mol%) were prepared by melt-quenching procedure. The absorption spectra, excitation, down conversion emission spectra, up-conversion (UC) emission spectra and decay time measurements were analyzed. In down conversion, the visible emission transition intensity associated with 5F4→5I8 (547nm), 5F5→5I8 (657nm), and 5F4→5I7 (755nm) of Ho3+ ions decreased with Yb3+ concentration due to the energy transfer (ET) process from Ho3+ to Yb3+ ions. In up-conversion, on exciting with 980nm diode laser beam, we observed a strong green (543nm) and red (657nm) UC emissions, that refers to the energy level transitions; 5F4 (5S2)→5I8 and 5F5→5I8 of Ho3+. The influence of excitation power on UC intensities studies revealed that the population at 5F4 (5S2) and 5F5 levels of Ho3+ ion occurs due to two-photon absorption process associated energy transfer from Yb3+ to Ho3+. The influence of Yb3+ doped concentration on UC was studied, and it is observed that both the green and red UC intensities improved significantly on increasing Yb3+ ions concentration.
ISSN:0366-3175
DOI:10.1016/j.bsecv.2023.01.002