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Considering the instability and toxicity of 3D Pb-based perovskite nanocrystals, lead-free low-dimensional organic–inorganic hybrid metal halides have attracted widespread attention as potential substitutes. Herein, two new tin-based 0D halides [H4BAPP]SnBr5·Br and [H4BAPP]SnCl5·Cl·H2O (BAPP = 1,4-bis(3-aminopropyl)piperazine) were synthesized successfully based on [SnX5]3− as an emission center. Typically, [H4BAPP]SnBr5·Br and [H4BAPP]SnCl5·Cl·H2O display broadband yellow and yellow-green light emissions originating from the radiative recombination of self-trapped excitons (STEs). The photoluminescence quantum yields (PLQYs) of the two compounds were calculated to be 19.27% and 2.36%, respectively. Furthermore, the excellent chemical and thermal stability and broadband light emissions reveal their potential application in solid-state white lighting diodes. [ABSTRACT FROM AUTHOR]

• Three new 1D lead halides were successfully prepared connected by purely corner-shared PbX 5 tetragonal pyramids. • These 1D lead halides can be considered as vacancy-type 1D perovskite lacking one terminal halogen atom, which exhibits two types of chains due to the different interconnection sites. • Compound 3 exhibits broadband yellow-green emission, which shows potential in fabrication of white-light emitting diodes. Herein, by well-designing organic cations as templates, we reported three new one-dimensional (1D) lead halides, [(Me) 4 -pipz]PbCl 4 (1), [(Me) 4 -pipz]PbBr 4 (2) and [DAPr-pipz]PbCl 4 ·H 2 O (3), connected by purely corner-shared tetragonal pyramid building units of PbX 5 (X = Cl, Br). Remarkably, compound 3 exhibits broadband yellow-green emission with photoluminescence quantum yield (PLQY) of 1.64% excited by UV light at room temperature, which shows potential in fabrication of white-light emitting diodes. This work provides a novel structural model to understand the relationship between structure and photoluminescence. [ABSTRACT FROM AUTHOR]