fig6

Figure 6. Optical properties of 2D RP phase perovskites. (A) Optical absorption and (B) photoluminescence (PL) spectrum (λ_ex = 450 nm) of (BA)₂(MA)_n-1Pb_nI_3n+1 (n = 1-5) single crystals. Reprinted with permission from ref.^[39]: Copyright 2022, American Chemical Society. (C) Time-resolved PL (TRPL) decay profiles (λ_ex = 401 nm) of (CH)₂(MA)_n-1Pb_nI_3n+1 (n = 1-4). Reprinted with permission from ref.^[48]: Copyright 2022, Springer Nature. (D) PL and (E) time-resolved PL (TRPL) spectra of (001) and (010) planes on (PEA)₂PbI₄ single crystals. Reprinted with permission from ref.^[47]: Copyright 2019, Elsevier.