Zero-dimensional hybrid tin halides with stable broadband light emissions

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 [H 4 BAPP]SnBr 5 ·Br and [H 4 BAPP]SnCl 5 ·Cl·H 2 O (BAPP = 1,4-bis(3-aminopropyl)piperazine) were synthesized successfully based on [SnX 5 ] 3− as an emission center. Typically, [H 4 BAPP]SnBr 5 ·Br and [H 4 BAPP]SnCl 5 ·Cl·H 2 O 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. Two new Sn 2+ -based 0D halides with [SnX 5 ] 3− as the optically active center were prepared, which displayed intrinsic broadband emissions with excellent chemical and thermal stabilities.