Physical Sciences Division
Published September 14, 2025 | Version v1
Journal article Metadata-only

Efficient Mn2+ Doping in Non-Stoichiometric Cesium Lead Bromide Perovskite Quantum Dots

Creators

  • 1. University of Oklahoma
  • 2. University of Chicago
  • 3. Texas A&M University
  • 4. Northwestern University
  • 5. U.S. Naval Research Laboratory

Description

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.

Additional details

Identifiers

DOI
10.1021/jacs.5c12086
Other
oai:uchicago.tind.io:16285

Funding

National Science Foundation
CHE-2316919
U.S. Department of Energy
DE-SC0021158
National Institute of General Medical Sciences
P20GM103640
National Science Foundation
DMR-2011854
National Science Foundation
CHE-2404291
National Institute of General Medical Sciences
P30GM145423

UChicago Information

Division(s)
Physical Sciences Division, Pritzker School of Molecular Engineering
Department(s)
Chemistry
Center(s) or Institute(s)
James Franck Institute