Zn Lattice Site-Dependent Emission of Sb³⁺-Doped (ETBT)₂ZnBr₄ Organic–Inorganic Halide Perovskite for Tunable Lighting and Night-Vision Applications

In the realm of lighting and display technologies, the pursuit of single-matrix multifunctional light sources that are both environmentally friendly and highly tunable is of the utmost necessity. We obtained an organic–inorganic halide perovskite crystal (OIHPCs) (ETBT) 2 ZnBr 4, which possesses two distinct crystallographic sites for Zn, namely Zn1 and Zn2. By doping with Sb 3+, a broad emission with two prominent emission peaks at 530 and 670 nm has been achieved, which originate from the triplet emission of Sb 3+ occupied at different luminescent centers. By altering the excitation wavelength, the luminescence color of the material can be tuned from green to yellow and then to red. Density functional theory (DFT) calculations confirmed the difference of band gap after Sb 3+ replacing Zn1 and Zn2, corresponding to the green and red emissions. Under 365 nm excitation, the emission spectrum of (ETBT) 2 ZnBr 4:Sb 3+ extends into the near-infrared region, making it suitable for applications such as night vision. This study provides a new approach to achieving single-host multifunctional light sources using nontoxic perovskite materials, offering potential applications in optoelectronic devices and bioimaging.