Doping metal ions into lead halide perovskite nanocrystals (NCs) has attracted significant attention over the past few years due to the emergence of novel optical properties. Previous successful dopants include transition metal ions like Mn2+, Cu2+, Zn2+ and rare earth metal ions such as Yb3+, Ce3+, Er3+, etc. Here, we report a synthesis of Cd2+-doped CsPbCl3 NCs by a hot injection method. The resulting NCs show a dual-wavelength emission profile with the preservation of cubic morphology and crystal structures. The emission profile can also be tuned by controlling different dopant precursor amounts. The secondary emission is proposed to be induced by an energy transfer process from host NCs to the dopants after photo-excitation, together with a subsequent electronic transition from excited state (3Eg) to ground state (1A1g) of [CdCl6]4- units, which matches well with a first-principles density functional theory calculation. Further, the resulting doped NCs can undergo fast anion exchange reactions by post-synthetic treatment. Our studies present a new model system for future doping chemistry studies and the potential of doped perovskite nanocrystals for various optoelectronic applications.

Doping metal ions into CsPbCl3 perovskite nanocrystals with improved optical properties for potential optoelectronic applications

2019 Fall National Meeting

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