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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of beta particles irradiation and thermal treatment on the traps levels structure and luminescent properties of BaMoO4 phosphor

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Kunzel, Roseli [1] ; Latini, Renato Mazin [2] ; Umisedo, Nancy K. [3] ; Yoshimura, Elizabeth Mateus [3] ; Okuno, Emico [3] ; Courrol, Lilia Coronato [1] ; de Azevedo Marques, Ana Paula [2]
Total Authors: 7
[1] Univ Fed Sao Paulo, UNIFESP, Dept Fis 18, R Scio Nicolau 210, BR-09913030 Diadema, SP - Brazil
[2] Univ Fed Sao Paulo, UNIFESP, Dept Quim, R Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil
[3] Univ Sao Paulo, Inst Fis, BR-05508900 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 45, n. 6, p. 7811-7820, APR 15 2019.
Web of Science Citations: 1

Molybdates compounds have been the subject of intense research due to their broad range of potential technological applications. This paper reports the influence of defects in optical and structural properties of barium molybdate (BaMoO4) using a wide range of characterization techniques. The effects of beta particles irradiation and heat treatment are studied to understand their role in defect generation or transformation. Raman and Fourier transform infrared spectroscopy (FTIR) spectra show remarkable changes with irradiation dose and heating rate. The analysis of these data suggests that irradiation with beta particles preserves the interaction on MoO4 clusters, whereas heat treatment changes the structural order, leading to an increase of the site symmetry density. ESR measurements, performed at room temperature, reveal that the defect concentration significantly increases after heat treatment of irradiated samples. An intensity reduction of Phototoluminescence (PL) and Thermoluminescence (TL) emissions are noticeable with increase of radiation dose, probably associated with reduction in the number of active luminescent centers and increase of non-radiative transitions probability. Trapping activation energies determined from TL glow curves range from 0.9 eV to 1.95 eV. This study points that blue and green emissions arise likely due to radiative recombination through localized defect states. (AU)

FAPESP's process: 10/06816-4 - Radiation attenuation and scattering by nanoestructured materials.
Grantee:Roseli Kunzel
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07437-5 - Production and characterization of nanostructures ceramic materials pure and hybrids
Grantee:Ana Paula de Azevedo Marques
Support type: Regular Research Grants
FAPESP's process: 16/20578-5 - Ceramic Materials Type Scheelite: Properties and its Relations with Morphology and Dimension
Grantee:Ana Paula de Azevedo Marques
Support type: Regular Research Grants
FAPESP's process: 10/16437-0 - Characterization and applications of dosimetric materials using optically stimulated luminescence and complementary techniques
Grantee:Linda Viola Ehlin Caldas
Support type: Research Projects - Thematic Grants