Publication date: 8th July 2026
Recently, perovskites have attracted great interest in optoelectronics due to their remarkable electro-optic properties. However, many conventional systems contain toxic lead, motivating the development of safer alternatives. In this context, Sb-doped Cs₂NaₓK₁₋ₓInCl₆ nanoparticles offer a unique platform. Their photoluminescence originates from self-trapped excitons (STEs), making the emission highly sensitive to lattice distortions and local structural changes. This allows us to investigate how lattice structure and composition affect the optical properties of these halide double perovskites.
In this study, we demonstrate, for the first time, the formation of a homogeneous solid solution across the full compositional range of this system. Increasing the Na content reduces the lattice parameters, leads to a clear blue shift in the emission and shorter carrier lifetimes. Sb doping appears to play a role in enabling the emission, while not significantly influencing the optical properties within the studied concentration range. These results show that compositional tuning enables precise control over emission in lead-free perovskites, offering insights for next-generation optoelectronic devices.
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