Circularly polarized luminescence enlargement from crystals to oriented films of enantiopure 2D hybrid perovskites.

Chiral 2D organic-inorganic hybrid perovskites (C-2D-OIHPs) with circularly polarized luminescence (CPL) have important promising applications in optical, electronic, and chiroptoelectronic devices. Herein, we report enantiomeric crystals of R / S -FMBA) 2 PbBr 4 . (FMBA = 4-fluorophenethylamine), which demonstrated bright room-temperature CPL emission. For the first time, the oriented films along the c -axis of this pair of C-2D-OIHPs exhibited a 16-fold increase in the asymmetry factors of absorbance ( g CD ) and a 5-fold rise in the asymmetry factors of CPL ( g lum ), reaching up to ± 1 × 10 -2 .