Tetrameric cluster assembled one-dimensional hybrid lead halides with broadband light emission

Abstract

It remains significant to explore new types of hybrid lead halides to realize the diversifications of structural and luminescence properties due to the excellent optoelectronic performances of perovskites. Herein, by choosing various organic molecules as cationic templates, we constructed a series of new one-dimensional (1D) lead halide perovskites, namely, [DMEDA]Pb₂Br₆·H₂O (1), [ATMPD]Pb₂Br₆·H₂O (2) and [TMPrDA]₂Pb₃X₁₀ (3: X = Br; 4: X = Cl). The crystal structures of compounds 1–4 contain 1D [Pb₂Br₆]²⁻ and [Pb₃X₁₀]⁴⁻ chains based on [Pb₄X₁₆] tetramer clusters as basic building units, respectively. Remarkably, compound 2 displays broadband yellow light emissions spanning the entire visible spectral range and centered at 534 nm, which can be ascribed to self-trapped excitons based on systematic characterization including time-resolved PL emission and theoretical studies. This work provides a series of new low-dimensional hybrid lead halides as prototypes to enrich the halide chemistry including crystal engineering and optoelectronic performance.