4.6 Article

Tb3+/Pr3+ co-doped ZnMoO4 phosphor with tunable photoluminescence and energy transfer processes

Journal

OPTICAL MATERIALS
Volume 96, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.optmat.2019.109332

Keywords

ZnMoO4:Tb3+; Pr3+; Photoluminescence; Photocatalysis; Energy transfer (ET)

Funding

  1. CNPq
  2. CAPES Brazilian research financing institutions

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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.

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