Quantum Confined Luminescence in Two Dimensions
Achieving localized light emission from monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) embedded in the matrix of another TMD has been theoretically proposed but not experimentally proven. In this study, we used cathodoluminescence performed in a scanning transmission electron microscope to unambiguously resolve localized light emission from 2D monolayer MoSe2 nanodots of varying sizes embedded in a monolayer WSe2 matrix. We observed that the light emission strongly depends on the nanodot size, wherein the emission is dominated by MoSe2 excitons in dots larger than 85 nm and by MoSe2/WSe2 interface excitons below 50 nm. Interestingly, at extremely small dot sizes (<10 nm), the electron energy levels in the nanodot become quantized, as demonstrated by a striking blue-shift in interface exciton emission, thus inducing quantum confined luminescence. These results establish controllable light emission from spatially confined 2D nanodots, which holds potential to be generalized to other 2D systems toward future nanophotonic applications.
Authors
- Saiphaneendra Bachu (ORCID: https://orcid.org/0000-0001-9898-7349)
- Nicholas Trainor (ORCID: https://orcid.org/0009-0007-3400-5327)
- Gwangwoo Kim (ORCID: https://orcid.org/0000-0001-8519-4411)
- Benjamin Huet
- Joan Marie Redwing (ORCID: https://orcid.org/0000-0002-7906-452X)
- Nasim Alem (ORCID: https://orcid.org/0000-0003-0009-349X)
- Leixin Miao (ORCID: https://orcid.org/0000-0002-5454-5765)
- Luiz H. G. Tizei (ORCID: https://orcid.org/0000-0003-3998-9912)
- Fatimah Habis
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Steffi Y. Woo (ORCID: https://orcid.org/0000-0002-2342-9083)
- Yuanxi Wang (ORCID: https://orcid.org/0000-0002-0659-1134)
- Mathieu Kociak (ORCID: https://orcid.org/0000-0001-8858-0449)
- Deep Jariwala (ORCID: https://orcid.org/0000-0002-3570-8768)
- Danielle Reifsnyder Hickey (ORCID: https://orcid.org/0000-0002-8962-1473)
Institutions
- University of North Texas (US)
- Centre National de la Recherche Scientifique (FR)
- Pennsylvania State University (US)
- Chungbuk National University (KR)
- National Institute for Materials Science (JP)
- Université Paris-Saclay (FR)
- Laboratoire de physique des Solides (FR)
- California University of Pennsylvania (US)
- University of Pennsylvania (US)
- Jazan University (SA)
Publication Details
- Journal
- ACS Photonics
- Published
- 2024-12-26
- DOI
- https://doi.org/10.1021/acsphotonics.4c01739
- Citations
- 5
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.59
Funders
- National Science Foundation
- Pennsylvania State University
- Asian Office of Aerospace Research and Development
- Agence Nationale de la Recherche
- Ministry of Education, Culture, Sports, Science and Technology
- Horizon 2020 Framework Programme
- Japan Society for the Promotion of Science