Modulation of the Excitation States in All-Inorganic Halide Perovskites via Sb3+and Bi3+Codoping

Sb3+-doped halide perovskites are promising candidates for solid-state lighting due to their diverse fluorescent colors and high efficiency. However, the mismatched high excitation energy with commercial UV chips is one of the critical issues to be addressed. Herein, a Bi3+ codoping strategy was established as a general and efficient approach to modulate the excitation spectrum from the Sb3+-doping center in all-inorganic perovskites of Cs2InCl5middotH2O, Cs2NaInCl6, and Rb3InCl6. The incorporated Bi3+ greatly enhanced the splitting of the A band (1S0-3P1 transition) and boosts the enormous redshift of the low-energy branch in all these systems. The interactions persist strongly even at extremely low doping concentrations, suggesting a dipole-based long-range interaction. The results provide an in-depth insight into the contribution mechanism of Bi3+ to Sb3+ in all-inorganic perovskites, which throws light upon tuning the excitation spectrum of broadband emission from the extrinsic self-trapped exciton (STE).

Automated summary

Sb3+-doped halide perovskites have potential for solid-state lighting due to their diverse colors and high efficiency. However, there is a critical issue of mismatched excitation energy with commercial UV chips. In this study, a Bi3+ codoping strategy was used to modulate the excitation spectrum in inorganic perovskites. The interaction between Bi3+ and Sb3+ persists even at low doping concentrations, resulting in enhanced splitting of the A band and redshift of the low-energy branch.