de Azevedo Marques, Ana Paula
Umisedo, Nancy K.
Latini, Renato Mazin
Yoshimura, Elizabeth Mateus
Total Authors: 6
 Univ Fed Sao Paulo, UNIFESP, Dept Quim, R Sao Nicolau 210 Ctr, BR-09913030 Diadema, SP - Brazil
 Univ Fed Sao Paulo, UNIFESP, Dept Fis, R Sao Nicolau 210 Ctr, BR-09913030 Diadema, SP - Brazil
 Univ Sao Paulo, Inst Fis, Cidade Univ, BR-09913030 Sao Paulo, SP - Brazil
Total Affiliations: 3
Journal of Alloys and Compounds;
FEB 25 2018.
Web of Science Citations:
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)