Tunable Luminescence of Sb³⁺ Doped 0D Cs₄PbCl₆ Nanocrystals from Three Distinct Emission Centers

Abstract Metal halide nanocrystals (NCs) with multiple emission centers are high‐potential luminescent materials used in versatile optoelectronic applications. However, technical challenges hinder the achievement of tunable emission bands in single‐component NCs. In this study, by elaborately using 0D Cs₄PbCl₆ to design Cs₄PbCl₆:Sb³⁺ NCs, multiple photoluminescence excited at specific energies without energy transfer occurred owing to the isolated and distinct centers in the 0D frame. The three emission centers at 368, 450 and 570 nm can be assigned to the ³P₁ → ¹S₀ transition of Pb²⁺ ions, D‐state emission of Pb²⁺ ions, and ³P₁ → ¹S₀ transition of Sb³⁺ ions, respectively. The emission colors of Cs₄PbCl₆:Sb³⁺ NCs can be easily tuned from ultraviolet to yellow by precisely modulating the excitation wavelength, and white‐light emission at 360 nm excitation with a color coordinate of (0.3026, 0.3264) is obtained owing to the simultaneous activation of Sb³⁺ ions and the D‐state. This study not only demonstrates a feasible scheme for designing multiple‐emitting metal halide NCs but also provides guidance for expansion of their applications in flexible optoelectronic devices.