Tm3+ doped barium molybdate: A potential long-lasting blue phosphor

Author(s)

de Azevedo Marques, Ana Paula ^[1] ; Kunzel, Roseli ^[2] ; Umisedo, Nancy K. ^[3] ; Latini, Renato Mazin ^[1] ; Yoshimura, Elizabeth Mateus ^[3] ; Okuno, Emico ^[3]

Affiliation

^[1] Univ Fed Sao Paulo, UNIFESP, Dept Quim, R Sao Nicolau 210 Ctr, BR-09913030 Diadema, SP - Brazil

^[2] Univ Fed Sao Paulo, UNIFESP, Dept Fis, R Sao Nicolau 210 Ctr, BR-09913030 Diadema, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis, Cidade Univ, BR-09913030 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 735, p. 707-717, FEB 25 2018.
• Web of Science Citations: 5

Abstract

Molybdates have applications in various fields such as phosphors, optical fibers, scintillators, magnets, sensors and catalysts. Thulium ion is an excellent blue activator and plays an important role in the design of persistent luminescent materials. This paper reports the investigation of the structural and luminescent properties of Barium Thulium Molybdate (Ba1-xTmx)MoO4 microcrystals (with x = 0, 0.01 or 0.03). The scheelite-type crystalline structure was identified from XRD and Raman studies. Under ultraviolet (359 nm) excitation, photoluminescence (PL) spectra present the characteristic emission bands at 453 nm and 545 nm which are due to the D-1(2) -> F-3(4) and D-1(2) -> H-3(4,5) transitions, respectively, from Tm3+ ions. Thermoluminescence (TL) measurements were performed with powdered samples previously irradiated with beta radiation. The depth of traps, associated with trap levels located inside the band-gap, was determined from TL data using different methods of glow curve analysis. The kinetic parameters, determined from thermoluminescent glow curves, provide evidence about a possible persistent luminescence emission from the (Ba0.97Tm0.03)MoO4 sample. This is a potential blue-light or ultraviolet long-lasting phosphor, with a trapping level lifetime, at room-temperature (300 K), of about 6 days. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 10/06816-4 - Radiation attenuation and scattering by nanoestructured materials.
• Grantee: Roseli Kunzel
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07437-5 - Production and characterization of nanostructures ceramic materials pure and hybrids
• Grantee: Ana Paula de Azevedo Marques
• Support Opportunities: 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 Opportunities: 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 Opportunities: Research Projects - Thematic Grants