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(A) Emission spectra as a function of time to observe the PL and EL features of CsPbBr3–xIx nanoparticle-based LED devices with initial spectra (solid line) and spectra after 120 s emission (white dots). (B) Peak positions of both EL (red circles) and PL (black squares) as a function of time. (C) Emission spectra of halide-segregated CsPbBr3–xIx bulk-based LED devices.
