Publication date: 21st July 2025
Colloidal lead halide perovskites (LHP) nanocrystals (NCs) are popular light-emissive materials for optoelectronic devices, of interest for LEDs, LCDs, lasers and quantum light sources. Most studies on LHP NCs focus on relatively large NCs exceeding 10 nm in size, exhibiting weak to no quantum confinement effects. Recently, we showed that perovskite quantum dots (pQDs) can be synthesized using a newly developed synthesis route, resulting in pQDs that are tunable between 3 and 13 nm range.[1] Further exploring the tunability of these QDs, we extend the emission of these materials through coupling these pQDs to anchored luminescent dyes, allowing for efficient energy transfer.[2] To also enhance the charge carrier extraction, donor/acceptor molecules can be tethered to the pQD. These molecules must strongly bind to the ionic surfaces of pQDs without compromising colloidal stability. This is achieved by using multifunctional ligands containing a quaternary ammonium binding group for strong pQD surface attachment, a long tail group for colloidal stability, and a functional group near the pQD surface.[3] Such pQDs with ferrocene-functionalized ligands show fast photoexcited hole transfer with near-unity efficiency. Density functional theory calculations reveal how ferrocene’s molecular structure reorganizes following hole transfer, affecting its charge separation efficiency. This approach can also be extended to photoexcited electron and energy transfer processes with pQDs. Therefore, this strategy offers a blueprint for creating efficient pQD–molecular hybrids for applications like photocatalysis.
We acknowledge financial support by the Bavarian State Ministry of Science, Research, and Arts and the LMU Munich through the grant “Solar Technologies go Hybrid (SolTech) and the LMUexcellent, funded by the Federal Ministry of Education and Research (BMBF) and the Free State of Bavaria under the Excellence Strategy of the Federal Government and the Länder.
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