Doping magnetic transition metal ions (e.g., Mn2+) into colloidal quantum dots endows novel optical and magnetic properties to the host materials. CsPbBr3 quantum dots (QDs) are emerging light-emitting materials with high structural and chemical flexibility in the visible spectral regime. However, efficiently doping Mn2+ ions in CsPbBr3 QDs remains challenging, especially when size confinement and ensemble uniformity are needed for understanding the underexplored exciton-dopant exchange interaction. Here, we introduce a doping mechanism based on electrostatic surface Mn2+ adsorption that enables efficient Mn2+ incorporation in strongly confined CsPbBr3 QDs. The resultant QDs are found to have a Cs-deficient stoichiometry compared to their undoped counterparts. A redox reaction-based purification method was developed to remove Mn2+ cations that are tightly adsorbed on the surface to determine the concentration of lattice-incorporated Mn2+. Our synthesis enables a Mn2+ doping/alloying concentration of up to ∼44% with a Mn2+ photoluminescence efficiency exceeding 90%. This allows for the determination of the intrinsic exciton-to-dopant energy transfer rate.
Hidayatova et al. (Sun,) studied this question.
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