Suppressed Stokes Shifts and Hot Luminescence from Quantum Dots within Plasmonic Nanocavities
Abstract Lead sulfide (PbS) quantum dots (QDs) hold great promise for solar energy conversion, yet their efficiency is compromised by a substantial Stokes shift that adversely affects their performance in photonic devices. Here, PbS QDs are integrated within single plasmonic nanocavities, significantly mitigating Stokes shifts through Purcell enhancement of their band edge emission. This approach entails bottom‐up assembly of QDs into nanoparticle‐on‐mirror structures, leading to direct emission from band‐edge excitons with radiative lifetimes suppressed below 1 ns, a drastic decrease from the 1600 ns observed in unmodified QDs. This manipulation of the Stokes shift is attributed to the increased photonic density of states within the nanocavity, which accelerates the radiative decay process and modifies exciton relaxation pathways. These results underscore the critical role of plasmonic nanocavities in modifying QD emission characteristics, offering opportunities for enhancing QD‐based device performance across a spectrum of photonic applications.
Authors
- Adam Roach
- Yuling Xiong (ORCID: https://orcid.org/0000-0003-1820-3722)
- Niclas S. Mueller (ORCID: https://orcid.org/0000-0002-8688-1974)
- Angela Demetriadou (ORCID: https://orcid.org/0000-0001-7240-597X)
- Junzhi Ye (ORCID: https://orcid.org/0000-0001-8919-9236)
- Lukas A. Jakob
- Junyang Huang (ORCID: https://orcid.org/0000-0001-6676-495X)
- Jeremy J. Baumberg (ORCID: https://orcid.org/0000-0002-9606-9488)
- Akshay Rao (ORCID: https://orcid.org/0000-0003-4261-0766)
- Shu Hu (ORCID: https://orcid.org/0000-0001-9703-7966)
- L. Sun (ORCID: https://orcid.org/0000-0003-0527-1777)
- Shijie Zhu (ORCID: https://orcid.org/0009-0005-5740-3913)
- Angus Crookes (ORCID: https://orcid.org/0009-0004-8786-1862)
Institutions
- Bowling Green State University (US)
- University of Cambridge (GB)
- University of Birmingham (GB)
Publication Details
- Journal
- Advanced Optical Materials
- Published
- 2025-02-27
- DOI
- https://doi.org/10.1002/adom.202500275
- Citations
- 1
- Primary Topic
- Quantum Dots Synthesis And Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.52
Funders
- National Science Foundation
- Royal Society
- Deutsche Akademie der Naturforscher Leopoldina - Nationale Akademie der Wissenschaften
- Engineering and Physical Sciences Research Council
- European Research Council
- HORIZON EUROPE European Research Council