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PL spectra of Er-doped (solid line A) and undoped (dash dotted line B) films excited at laser. The inset is the annealing behavior of the PL intensity at from .
XRD spectra of the samples annealed at 600, 700, 800, and , respectively. The monoclinic phase and cubic phase marked as M and C, respectively.
PLE spectrum of in film excited with a Xe lamp at room temperature. Arrows indicate the direct excitation. The inset is schematics of the energy transfer process mediated by O vacancy: (i) exciting or trapped pairs at O vacancy, (ii) transferring energy to Er ions and exciting electrons to the resonant high levels, (iii) electrons transiting to the first excited states, and (iv) emitting the light from the first excited state to the ground state.
(Color online) PL spectra of Er-doped (curve A) and undoped (curve B) films excited with a laser. The curves S1 and S2 are the simulation of Gaussian distribution of the curve B. The inset is the EPR signal of the film annealed at .
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