Tb3+/Pr3+ co-doped ZnMoO4 phosphor with tunable photoluminescence and energy transfer processes
Abstract: ZnMoO4:Tb3+, Pr3+ particles in different Tb:Pr ratios (2:0, 1.5:0.5, 1:1, 0.5:1.5 and 0:2) were synthesized by the sonochemical method. These materials were characterized structurally, morphologically and optically by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Ultraviolet-visible absorption spectroscopy and Photoluminescence (PL). From studying the photoluminescent properties, the PL spectra presented D-5(4) -> F-7(j) (j = 6, 5, 4 and 3) transitions bands of Tb3+, along with the transitions P-3(0) -> H-3(5), D-1(2) -> H-3(4), P-3(0) -> H-3(6) and P-3(0 )-> F-3(3) of Pr3+. Time resolved photoluminescence was investigated and an energy transfer (n) mechanism between the matrix and the Tb3+ and Pr3+ ions is simultaneously proposed for better understanding the process efficiency. Parallel to this perspective, the photocatalytic behavior of ZnMoO4:Tb3+, Pr3+ was evaluated. The degradation of methylene blue dye was favored by the effect of increasing the Pr3+ concentration. This work deals with the development of inorganic phosphor materials capable of converting UV radiation into light-emitting diode, which can be suitably combined to produce white light.
Author(s): Lovisa, LX; Fernandes, YLRL; Garcia, LMP; Barros, BS; Longo, E; Paskocimas, CA; Bomio, MRD; Motta, FV
OPTICAL MATERIALS
Volume: 96 Published: OCT 2019
DOI: 10.1016/j.optmat.2019.109332
