Lead‐Free Perovskite With Efficient Tellurium Ion Activation for Multifunctional Applications

Lead-free perovskite materials have received extensive attention due to their non-toxicity, super environmental stability and adjustable photoelectric properties. However, the inherent problems of low luminous efficiency and low photoluminescence quantum yields (PLQYs) limit its development in multifunctional applications. Here, Te⁴⁺ doped Cs₂ZrCl₆ with high luminous efficiency and stability for multifunctional applications are developed. Te⁴⁺ ions are used as emission centers to improve the optical properties of Cs₂ZrCl₆ to make efficient and stable single-component white light-emitting diodes (WLEDs), and can be used as scintillator materials to improve scintillation performance to achieve high-resolution and low-dose X-ray imaging detection. In addition, it is found for the first time that Te⁴⁺ ions can be introduced into the trap center, so that the Cs₂ZrCl₆:Te⁴⁺ perovskite material exhibits excellent persistent luminescence (PersL) and mechanoluminescence (ML) after X-ray radiation, which has potential applications in the fields of delayed imaging and stress sensing. This work provides a method for designing lead-free perovskites with high optical performance and scintillating properties, as well as developing multifunctional applications.