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. 2018 Nov 27;4(1):54–62. doi: 10.1021/acsenergylett.8b02207

Figure 1.

Figure 1

(A and B) Normalized photoluminescence spectra obtained under continuous wave (CW) excitation (405 nm, Iexc = 10 mW cm–2) with initial spectra (line) and spectra after 10 min of irradiation (symbols) and (C and D) peak position as a function of time for CsPbBr3–xIx (A and C) NPs and (B and D) bulk films after annealing at 225 °C for 180 s. Note that the emissions from annealed bulk CsPbI3 or CsPbBr3–xIx films (x = 2.67) are from minor cubic phase with dark red color. After formation of the bulk film, the major crystalline phase of CsPbI3 or CsPbBr3–xIx films (x = 2.67) changes to orthorhombic phase with yellow color.