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Stability of CsPbBr3. (A) XRD patterns of as-grown CsPbBr3 before testing (black), after exposure to air for 2 mo (red), and after annealing at 200 °C (blue). In both cases, the CsPbBr3 phase remained identical to the as-grown and indicated high compositional stability. (B) Integrated emission intensity for CsPbBr3 nanowires under constant pulsed excitation (1.2 Pth) while exposed to nitrogen (blue) and ambient atmosphere (red).
