Room temperature synthesis of Mn-doped Cs3Pb6.48Cl16 perovskite nanocrystals with pure dopant emission and temperature-dependent photoluminescence

Abstract

In recent years, halide perovskites have attracted great attention as a type of well-known material, especially inorganic perovskites like CsPbX₃ (X = Cl, Br, and I). Herein, we introduce a new family of doped nanocrystals offering unique insights into the synthetic chemistry of doped perovskites. Mn-Doped Cs₃Pb_6.48Cl₁₆ nanocrystals with pure dopant emission were prepared at room temperature with a low Mn/Pb feed ratio (>1.4). The band edge luminescence of Mn:Cs₃Pb_6.48Cl₁₆ was almost completely inhibited, and the photoluminescence quantum yields (PL QYs) of Mn ions could reach up to 25%. Furthermore, the temperature-dependent PL spectra and temperature-dependent lifetime of the new family of doped nanocrystals indicated that the inflection point affects both the PL intensity and the PL lifetime of Mn²⁺ ions with increasing the temperature, which is related to the Mn/Pb ratio.