Tunable white light emission in antimony doped vacancy-ordered double perovskite Cs2ZrCl6 nanocrystals

Design of stable white-light emitting materials based on the emerging lead-free metal halide colloidal nanocrystals is in urgent demand for lighting technology innovation. Herein, we developed a facile hot-injection method and optimize the synthesis conditions to prepare Sb3+ doped Cs2ZrCl6 nanocrystals with good uniformity and crystallinity. Sb3+ ions were doped into the Cs2ZrCl6 lattice and proved to occupy the sites of Zr4+ ions, generating additional absorption bands at lower energy and new emission band centered at 620 nm apart from the absorption and emission from the host. The emission at 620 nm from Sb3+ ions could be prompted by an energy transfer process between the host STEs and Sb3+ ions. Moreover, benefiting from two broad emission bands from singlet and triplet states of Sb3+ ions in Cs2ZrCl6 nanocrystals, we obtained tunable white-light-emitting nanocrystals by adjusting the dopant concentration. Our study provides a reliable method to design efficient single-emitter-based white-light emitting metal halide nanocrystals and promote their development in the field of lighting and displays.