Fig. 2.

Re-optimization and characterization of the components in OIMH, along with evidence of energy transfer. a Schematic diagram of spin coater with big PET film onside, the right picture is the XRD of the corresponding area on the PET. b Schematic diagram of the crystal structure of (NEA)₂MnBr₄ film with denser organic components. c FTIR absorption spectra of (NEA)₂MnBr₄ spin-coated and drop-casted films. d PL spectra of pristine film and spin-coating film. e Overlap area of blue emission and green excitation. f PL lifetime of (NEA)₂MnBr₄ and precursor NEABr. (Color figure online)