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Pint, Iago Carvalho; Camargo, Andrea Simone Stucchi de; Galleani, Gustavo, E-mail: iagocp@usp.br
Proceedings of the 18. Brazil MRS Meeting 20192019
Proceedings of the 18. Brazil MRS Meeting 20192019
AbstractAbstract
[en] Full text: Ultraviolet (UV) radiation raises interest due to its potential damage to human health but also its use in biological applications. UV radiation is divided in three bands, in which UV-A (315-400 nm) composes the highest portion that hits the earth surface while most of UV-B (315-280 nm) and UV-C (280-100) are absorbed by the earth’s atmosphere. Glass-based scintillators have been viewed as a reliable, lighter, more efficient and lower cost alternative to crystals, for measuring UV radiation. In this work we develop a new composition of fluorophosphates glasses doped with dysprosium and europium ions and characterize their scintillating potential. The glasses are obtained by the melt quenching technique, with the composition 35NaPO3 - 30Ba(PO3)2 - 25MgF2 -( 10- x)YF3 – x[EuF3 or Dy2O3] with x = 0.0; 0.1; 0.5; 1.0; 1.5; 2.0 and 4.0 mol% EuF3, or x = 0.0; 0.25; 0.5 and 1.0 mol% Dy2O3. X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC) were performed in order to analyze the structural and thermal properties of the glass. UV-visible spectroscopy was performed to verify its ability to absorb UV radiation and in what range. Photoluminescent excitation and emission measurements were performed at room temperature and the luminescence decay curves in time were registered by monitoring the transitions 5D->7F2 for Eu3+, and 4F9/2->6H13/2 for Dy3+. In general, the glasses show good chemical stability, appropriate UV to visible conversion by Dy and Eu ions, and low interference on excited state lifetime with increasing dopant concentration. By fitting the decay curves with single exponential functions long averaged 5D0 excited state lifetime values were found for Eu3+ doped samples (tavg= 2.5 ± 0.1 ms) and for dysprosium 4F9/2 excited state the values averaged 0.71 ± 0.03 ms. The materials are still under characterization but already stand as a promising candidates for UV sensors and scintillators. (author)
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Brazilian Material Research Society (B-MRS), Rio de Janeiro, RJ (Brazil); [2521 p.]; ISBN 978-85-63273-40-6;
; 2019; p. 1779; 18. Brazil MRS Meeting; Camboriu, SC (Brazil); 22-26 Sep 2019; Available from the Library of the Brazilian Nuclear Energy Commission, Rio de Janeiro; Code: 4EPX

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