Fig. 7


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(a)–(b) PL images emitted at high and low energies, averaged in the [1.63,1.68] eV and the [1.55,1.61] eV ranges, respectively, and normalized with respect to their spatial average. They are obtained with the excitation at 2.07 eV. (c) Ratio of the absorptivity image in the low energy range to the one in the high energy range, corresponding in first approximation to the absorptivity between [1.55,1.61] eV.

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