Photophysical properties of tetrabutylammonium metal chlorides with different inorganic frameworks.

The luminescence of single crystals of (TBA)PbCl 3 , (TBA) 2 Sb 2 Cl 8 , (TBA) 3 Bi 2 Cl 9 and (TBA)SnCl 5 ·2EtOH (TBA = tetrabutylammonium, EtOH = Ethanol) synthsized were assigned distinctively to the centres of self-trapped excitons (STEs), TBA + , TBA + and co-emission of STEs and TBA + . This work demonstrates that organic cations without benzene or aromatic rings can also be used as the sole luminescence centres for metal halides.