Broadband red emission from one-dimensional hexamethonium lead bromide perovskitoid

Broadband emissions from low-dimensional hybrid perovskites have aroused intense interest. However, the achievement of broadband red emission in lead halide perovskites remains challenging. Herein, we report a one-dimensional (1D) hybrid lead bromide perovskitoid, (HM)Pb2Br6 (HM = hexamethonium), featuring a corrugated 3 x 3 [Pb2Br6]2- chain. The unique structure results in intriguingly red emission peaking at 692 nm, with a PLQY of around 6.24%. Our spectroscopic and computational studies reveal that the red emission derives from self-localized Pb23+, Pb3+ and Br2- species confined within the inorganic lead bromide lattice that function as radiative centres. This finding will benefit the design of perovskite systems for efficient red emission. A 1D (HM)Pb2Br6 based on hexamethonium has been developed for broadband red emission with a PLQY of 6.24%. Mechanistic investigations reveal that the red emission derives from the self-localized Pb23+, Pb3+ and Br2- species.

Automated summary

A one-dimensional hybrid lead bromide perovskitoid based on hexamethonium has been developed for broadband red emission. The unique structure results in intriguingly red emission peaking at 692 nm, with a PLQY of around 6.24%. Spectroscopic and computational studies reveal the origin of the red emission.