2D pentamethylenediammonium lead bromide single crystal with distinctive smooth and continuous morphology and decreased interlayer distance exhibits promising photoconductivity performance.
Lead-free zero-dimensional (0D) hybrid bismuth halide perovskites have aroused great interest due to their promising emission properties and good chemical stability. Herein, we report the design and synthesis of mixed-cation-phase 0D guanidinium−formamidinium bismuth chloride, [C(NH 2 ) 3 ] 2 [CH(NH 2 ) 2 ] 3 Bi 2 Cl 11 (denoted as Gua 2 FA 3 Bi 2 Cl 11 ), where an individual corner-sharing [Bi 2 Cl 11 ] 5− dimer is completely isolated and surrounded by the mixed Gua + and FA + organic cations. The corner-sharing connectivity mode in Gua 2 FA 3 Bi 2 Cl 11 differs from that in pristine Gua 3 BiCl 6 , featuring an isolated [BiCl 6 ] 3− unit. Importantly, Gua 2 FA 3 Bi 2 Cl 11 yields remarkable broadband emission spanning from 350 to 750 nm, different from the pristine Gua 3 BiCl 6 , showing distinct narrowband emission. Further investigation of photophysical properties reveals that the broadband emission has contributions from both free excitons and selftrapped excitons. Moreover, Gua 2 FA 3 Bi 2 Cl 11 not only exhibits excellent photostability under continuous high-power UV lamp irradiation during 70 min but also is humidity stable for over 6 months under ambient conditions. This finding presents a novel molecular engineering strategy for the development of eco-friendly and stable 0D perovskite broadband emitters.
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