Szczegóły publikacji

Opis bibliograficzny

Analysis of thermal and structural properties of germanate glasses co-doped with $Yb^{3+}/Tb^{3+}$ ions / J. Zmojda, M. Kochanowicz, P. Miluski, D. Dorosz, P. JELEŃ, M. SITARZ // Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy ; ISSN 1386-1425. — 2014 — vol. 131, s. 702-707. — Bibliogr. s. 707, Abstr.


Autorzy (6)


Słowa kluczowe

kinetic studystructural propertiesco-operative upconversion emissiongermanate glassYb3+/Tb3+

Dane bibliometryczne

ID BaDAP83511
Data dodania do BaDAP2014-09-19
Tekst źródłowyURL
DOI10.1016/j.saa.2014.05.047
Rok publikacji2014
Typ publikacjiartykuł w czasopiśmie
Otwarty dostęptak
Czasopismo/seriaSpectrochimica Acta, Part A, Molecular and Biomolecular Spectroscopy

Abstract

In the work the new glass compositions in the GeO2-GaO-BaO system have been prepared and thermal, structural properties of in germanate glasses co-doped with Yb3+/Tb3+ions were studied. Glasses were obtained by conventional high-temperature melt-quenching technique. The study of the crystallization kinetics processes of glasses co-doped with 0.7Yb2O3:0.7Tb2O3 was performed with DSC measurements. The activation energies have been calculated using Freedman analysis and verified with the Flynn-Wall-Ozawa method. In this order, the DSC curves have been registered with different heating rates, between 5 and 15 degrees/min. The structure of fabricated glasses has been studied by infrared and Raman spectroscopes. The effect of heat treatment on the structural properties was determined. In all glass samples the dominated infrared absorbance band at 800 cm-1 corresponds to asymmetric stretching motions of GeO4 tetrahedra containing bridging (Ge-O(Ge)) and non-bridging (Ge-O-) oxygens. Additionally, the influence of heat treatment on the luminescent properties was evaluated. Strong luminescence at 489, 543, 586 and 621 nm corresponding to 5D4 → 7FJ (J = 6, 5, 4, 3) transitions was measured. The highest upconversion emission intensity was obtained in the germanate glass co-doped with 0.7Yb2O3/0.7Tb2O3. © 2014 Elsevier B.V. All rights reserved.

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