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SEM images of (a) as-spun and (b) -annealed nanofibers. (c) XRD patterns of 3% Tb-doped nanofibers annealed in air at .
(a) PL spectra of 3% Tb-doped nanofibers annealed in air at . (b) PL spectra of containing different concentration of Tb annealed in air at .
(a) PL spectra of 3% Tb-doped nanofibers annealed in (i) air, (ii) , (iii) at . Inset shows the XRD patterns of (ii) and (iii) samples. (b) The evolution of the green PL intensity at 543 nm of 3% Tb-doped nanofibers as a function of thermal treatments process at and , respectively.
PLE spectrum (monitored at 543 nm) of in nanofibers. The inset is the schematic diagram of the energy transfer process mediated by O vacancy: (i) exciting or trapped e-h pairs at O vacancy, (ii) transferring energy to Tb ions and exciting electrons to the resonant high levels, (iii) phonon assisted non-radiative transition of , and (iv) radiative transition of .
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