Thermally responsive multistate fluorescence coupled with uniaxial negative thermal expansion in 1D lead halide hybrids.

ABSTRACT: Lead halide hybrids exhibit excellent optoelectronic properties, particularly in the development of high-performance solar cells and light-emitting diodes (LEDs). Increasing attention is being directed toward their thermal expansion behavior, as temperature-dependent bandgaps are crucial for solar cell and light emitting applications. Here, we report two new isomorphic one-dimensional (1D) lead halide hybrids, [XMePyr][PbX₃] (XMePyr⁺ = 1-(2-haloethyl)-1-methylpyrrolidinium; X = Br (1) or Cl (2)), featuring rare hemidirected PbX₅ (X = Br or Cl) square pyramidal chains, a stereochemically active coordination geometry uncommon in this class of materials. Both compounds undergo isostructural phase transitions at 255 K (1) and 351 K (2), likely driven by the ste

SUBMITTER: Yang G 

PROVIDER: S-EPMC12434494 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature