Fig. 2: Optical properties of pristine and halogen-substituted perovskites.
From: Molecular engineering towards efficientwhite-light-emitting perovskite
a–c Absorption (dashed lines) and PL spectra (solid lines) of (FPMA)2PbBr4, (ClPMA)2PbBr4 and (BrPMA)2PbBr4. d CIE chromaticity coordinates of (PMA)2PbBr4 (black dot), (2-FPMA)2PbBr4 (yellow dot), (2-ClPMA)2PbBr4 (red dot) and (2-BrPMA)2PbBr4 (pink dot). e Digital images of (PMA)2PbBr4, (2-ClPMA)2PbBr4, (3-ClPMA)2PbBr4 and (4-ClPMA)2PbBr4 crystals under ambient light (upper) and UV light (lower).
