Antimony-doped enhanced photoluminescence quantum yield in zero-dimensional lead-free metal halide Rb2CsBiCl6 crystals

Abstract

Zero-dimensional (0D) lead-free all-inorganic metal halides have emerged as next-generation photoluminescent (PL) materials in recent years because of their extraordinary PL properties, non-toxicity, and high stability. Herein, a green, high stability, all-inorganic Rb₂CsBiCl₆ single crystal with 0D structure was grown as a new PL material. Strikingly, using the antimony doping strategy, the broad yellow emission of Rb₂CsBiCl₆ was significantly enhanced due to the enhanced absorption in the UV region, and the PL quantum yield was increased from 1% to 45% at room temperature. Furthermore, the fluorescent mechanism was revealed by the combination of optical characterizations and first-principles calculations.