Organic–inorganic hybrid perovskites (OIHPs) have
emerged
as a prominent class of materials due to their diverse structures
and tremendous potential in optics and electronics. Herein, we present
two one-dimensional (1D) OIHPs, (C22H18N2)(PbX3)2 (X = Cl or Br), in the form
of single crystals and microcrystals that incorporate a bisprotonated
bipyridinium compound as the organic cationic component. These two
OIHPs possess a double-perovskite 1D chain structure, where the organic
bipyridinium cations are linked to the perovskite octahedra through
N–H···X hydrogen bonds. The chloride OIHP displays
two emission bands that are attributed to the singlet free exciton
of the organic moiety and the singlet self-trapped exciton (STE) of
the perovskites, respectively. In contrast, the bromide analogue exhibits
a single broad emission band originating from the triplet STE of the
perovskites. Excitation wavelength and temperature-dependent photoluminescence
studies provide insights into the distinct emission mechanisms of
these two Pb-based OIHP materials.