Fig. 3: Structure-property relationship between structural distortions and exciton confinement in 2D perovskites.
From: Atomically confined excitons in 2D perovskites for bright and sub-nanosecond scintillation
a Crystal structures of (1,4-CMA)PbBr4, (CMA)2PbBr4, (CMA-COOH)2PbBr4 and (1,3-CMA)PbBr4. b The summary of in-plane tilting (Din) and out-of-plane tilting (Dout) of representative 2D perovskites. c Temperature-dependent full width at half maximum (FWHM) of PL spectra for the synthesized 2D perovskites. The inset is the PL spectra at room temperature. d The exciton diffusion dynamics of BM2PbBr4, (CMA)2PbBr4 and (1,4-CMA)PbBr4. The inset shows the transient photoluminescence mapping of the (1,4-CMA)PbBr4 single crystal. D represents carrier diffusion coefficient. e Electrostatic potential (φmax) of the representative amines in 2D perovskites. f Temperature-dependent intensity of PL spectra and the fitted excitonic binding energy (Eb). The inset is the temperature-dependent PL spectra for (1,4-CMA)PbBr4.
