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(a) Pump-fluence dependent emission spectra of a close-packed film of CsPbBr3 nanocrystals excited with 400 nm, 100 fs pulses. The fluence was tuned from 3 to 25 mJ cm–2. The sharp feature emerging on the longer-wavelength side of the recorded spectra is due to ASE. (b) An illustration of spectral tunability of ASEachieved by adjusting the composition of the halide component. All panels reproduced with permission from ref (24) (CC-BY 4.0).
