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- W3049210380 abstract "Luminescence and photocatalysis are two important properties of optical materials for photoenergy conversion. In this work, pure- (TNO) and Eu3+-doped-Te3Nb2O11 (TNO:Eu) were prepared by sol–gel method combined with solid-state reaction routine. Te3Nb2O11 shows an intrinsic luminescence band peaked at 485 nm, which was quenched after Eu3+ doping. TNO:Eu presents red-emitting color from radiative transitions 5D0 → 7FJ (J = 0–4) of Eu3+ ions. Surface oxygen vacancies could be successfully induced on Eu3+-doped-Te3Nb2O11 nanoparticles via low-temperature annealing in the CO atmosphere. The annealed TNO:Eu sample with surface oxygen vacancies can narrow the bandgap via broadening the valence band. Both red-luminescence and photocatalysis were greatly enhanced after the annealing treatments. The surface oxygen vacancies were verified by the measurements such as X-ray photoelectron spectroscopy (XPS), Raman spectra, induced optical absorption, and electron paramagnetic resonance (EPR), etc. It could be suggested that fast decay time (6.14 μs) of Te3Nb2O11 causes an efficient recombination of the light-induced charges. The introduction of different Eu3+ midgap states in TNO:Eu provides longer decay time (1.25 ms) for the excited states improving charge-separation upon photo-excitation during photocatalysis." @default.
- W3049210380 created "2020-08-21" @default.
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- W3049210380 date "2020-12-01" @default.
- W3049210380 modified "2023-10-17" @default.
- W3049210380 title "Surface oxygen defects induced via low-temperature annealing and its promotion to luminescence and photocatalysis of Eu3+-doped Te3Nb2O11 nanoparticles" @default.
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- W3049210380 doi "https://doi.org/10.1016/j.apsusc.2020.147502" @default.
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