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(a) Infrared absorption spectra and (b) Raman shift for different annealing temperatures.
Dark field views of samples annealed at (a) (a) and at (b) .
Photoluminescence excitation spectra at for samples annealed at 700 and .
Influence of the annealing temperatures on the PL spectra for excitation at (a) 325 nm and (b) 488 nm. (c) Decay time for the different annealing temperatures. (d) Dependence of the ratio with the annealing temperature for excitation wavelengths equal to 325 nm (◼) or 488 nm (●).
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