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PL spectra of samples A and B, measured at (a) RT and (b) with an excitation power of and an excitation wavelength of .
PL spectra of the as-grown samples and after annealing at for for (a) sample A and (b) sample B, measured at with an excitation power of .
PL intensity ratio vs annealing time for sample A annealed at (엯) and (●), and for sample B annealed at (◻) and (×).
PL spectra of the as-grown sample B and after thermal annealing at for measured at with an excitation power of .
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