DOE OSTI · 2998295
Efficient Mn 2+ Doping in Non-Stoichiometric Cesium Lead Bromide Perovskite Quantum Dots
Abstract
Doping magnetic transition metal ions (e.g., Mn 2+ ) into colloidal quantum dots endows novel optical and magnetic properties to the host materials. CsPbBr 3 quantum dots (QDs) are emerging light-emitting materials with high structural and chemical flexibility in the visible spectral regime. However, efficiently doping Mn 2+ ions in CsPbBr 3 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 Mn 2+ adsorption that enables efficient Mn 2+ incorporation in strongly confined CsPbBr 3 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 Mn 2+ cations that are tightly adsorbed on the surface to determine the concentration of lattice-incorporated Mn 2+ . Our synthesis enables a Mn 2+ doping/alloying concentration of up to ∼44% with a Mn 2+ photoluminescence efficiency exceeding 90%. This allows for the determination of the intrinsic exciton-to-dopant energy transfer rate.
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Hidayatova, Lamia [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0009000900382567), Mi, Chenjia [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:000000032169864X), Akhmedov, Novruz G. [Univ. of Oklahoma, Norman, OK (United States)], Liu, Yuan [Univ. of Chicago, IL (United States)], Shafiq, Arjumand K. [Univ. of Oklahoma, Norman, OK (United States)], Afshari, Hadi [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0000000179846313), Mohamed-Raseek, Nishya [Univ. of Oklahoma, Norman, OK (United States)], Popy, Dilruba A. [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0000000150173274), Xiang, Sisi [Texas A & M Univ., College Station, TX (United States)], Chen, Yi-Chen [Univ. of Chicago, IL (United States)], Saparov, Bayram [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0000000301909585), Peters, John W. [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0000000191179568), Talapin, Dmitri V. [Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)] (ORCID:0000000264148587), Chen, Bin [Northwestern Univ., Evanston, IL (United States)] (ORCID:0000000221067664), Furis, Madalina [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0000000190075492), Glaser, Evan R. [Naval Research Laboratory (NRL), Washington, DC (United States)], Dong, Yitong [Univ. of Oklahoma, Norman, OK (United States)] (ORCID:0000000270693725). 2025-09-14. Efficient Mn 2+ Doping in Non-Stoichiometric Cesium Lead Bromide Perovskite Quantum Dots. https://doi.org/10.1021/jacs.5c12086
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