Fig. 1. Optical (a) absorption, and (b) photoluminescence of the CsPbI3 QDs dispersed in hexane.
Fig. 3. PL spectra during a CsPbBr3 to CsPbI3 NC conversion for two different starting CsPbI3 QD samples. (a) 678 nm emitting, and (b) 692 nm emitting CsPbI3 QD samples.
Fig. 2. (a) PL spectra during a CsPbI3 to CsPbBr3 QD conversion. (b) Powder XRD patterns of pristine CsPbI3 QDs (red) and anion exchanged CsPbBr3 QDs (green), in which the bars on the top and bottom represent the bulk structures of CsPbI3 and CsPbBr3, respectively.
Fig. 4. (a) In- situ PL spectra during a CsPbI3 to CsPbBr3 QD conversion. (b) PL spectrum at the reaction time of 80s (green) fitted by the sum of three Gaussian peaks (wine), with separate P1 (red), P2 (green), and P3 (blue) components. (c) PL peak center, (d) PL intensities, and (e) PL linewidth of the deconvoluted PL spectra in figure (a).
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