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Ce3+ induced broadband enhancement around 2 μm in Tm3+/Ho3+ co-doped tellurite glass.
- Source :
-
Ceramics International . Apr2023, Vol. 49 Issue 8, p12301-12308. 8p. - Publication Year :
- 2023
-
Abstract
- Tellurite glasses doped with Tm3+, Ho3+ and Ce3+ ions were prepared via melt-quenching to realise broadband and fluorescence enhancement in near-infrared (NIR) band. Under the pumping of a commercial 808 nm laser diode (LD), the emission bands at 2.0 μm, 1.85 μm, 1.47 μm, and 705 nm were observed in the Tm3+/Ho3+ co-doping glass samples, which originated from the transitions of Ho3+:5I 7 →5I 8 and Tm3+:3F 4 →3H 6 , 3H 4 →3F 4 , 3F 2,3 → 3H 6 , respectively. The existence of 2.0 μm band fluorescence is due to the energy transfer from the Tm3+:3F 4 level to the Ho3+:5I 7 level. This band overlaps with the 1.85 μm band which forms a broadband fluorescence spectrum in the range of 1600–2200 nm. In glass samples co-doped with Tm3+/Ho3+ with 0.085 mol% Ho 2 O 3 and 1 mol% Tm 2 O 3 , the full width at half maximum (FWHM) of this broadband spectrum (1600–2200 nm) was as high as ∼370 nm. After introducing 0.6 mol% CeO 2 , the emission intensity of broadband fluorescence increased by ∼50%, which was caused by the cross-relaxations between Ce3+ and Tm3+ ions. The lifetime of fluorescence decay was determined to prove the interactions among the doped rare-earth ions, the radiative parameters such as transition probability, branching ratio and radiative lifetime were calculated from the absorption spectra based on the Judd-Ofelt theory to better understand the observed luminescence phenomena. In addition, X-ray diffraction (XRD) confirmed the amorphous state structure of the synthesised glass samples, while Raman spectrum revealed the different vibrational structural units forming the glass network. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 49
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 162257416
- Full Text :
- https://doi.org/10.1016/j.ceramint.2022.12.085