期刊
NANO LETTERS
卷 17, 期 6, 页码 3837-3843出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01237
关键词
Self-assembly; back focal plane imaging; exciton; 2D materials; energy transfer
类别
资金
- Center for Excitonics, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001088]
- Office of China Postdoctoral Council under the international Postdoctoral Exchange Fellowship Program [20140040]
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF [DMR-1332208]
- National Science Foundation [DMR-08-19762]
Using liquid-liquid interfacial assembly, we control the deposition of CdSe nanoplatelets into face-down or edge-up configurations. Controlled assembly, combined with back focal plane imaging, enabled unambiguous determination of the transition dipole orientation. The transition dipole moment of the emissive band-edge exciton in CdSe nanoplatelets was found to be isotropically oriented within the plane of the nanoplatelet with no measurable out-of-plane component and no preference for the long- or short-axis of the nanoplatelet. Importantly, CdSe nanoplatelet films in the face-down configuration exhibited unity dipole orientation within the plane of the film, which could improve the external efficiency of nanoplatelet LEDs, lasers, photodetectors, and photovoltaic cells beyond that which is possible with isotropic emitters. We also show that the two self-assembled configurations have different Forster energy transfer rates, as a result of different dipole orientation and internanoplatelet distance.
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