Structural evolution and photoluminescence properties of hybrid antimony halides

Low-dimensional hybrid antimony halide perovskites have fascinated the extensive research for their excellent photoluminescence behaviors. However, reasonable optimization of luminescence performance through molecule-level structural regulation remains a formidable challenge. The solution evaporation method with the reaction of organic amines and acid solutions of metal salts is a well-established method for the synthetic of low-dimensional hybrid antimony halide. In this work, by selecting organic cations with different sizes as template molecules, we have successfully synthesized three hybrid antimony halides of 0D [HDBA](2)SbCl5 (1), 0D [H(2)ATMP](2)SbCl7 (2) and 1D [H(3)PMDETA]Sb2Cl9 (3) (DBA = dibutylamine, ATMP = 4-amino-2,2,6,6-tetramethylpiperidine, PMDETA = N,N,N',N '',N ''-pentamethyldiethylenetriamine). by the solution evaporation method at room temperature for 2-5 days. These hybrid antimony halides exhibit broadband yellow-light with the highest photoluminescence quantum yield (PLQY) of 8.38%. According to detailed spectroscopy characterizations and theoretical calculations, the broadband light emissions should originate from self-trapped excitons (STEs). These antimony halides could be fabricated as white LEDs with highest color rendering index (>90%). The intrinsic broad-band light emissions and facile assembly process enable these hybrid antimony halides as promising candidates for yellow-light emitting materials.