Journal
NANO LETTERS
Volume 18, Issue 11, Pages 6948-6953Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02865
Keywords
Excimer; nanoplatelet; two-dimensional; photoluminescence; amplified spontaneous emission
Categories
Funding
- U.S. Department of Energy (DOE) Office of Science User Facility [DE-AC02-06CH11357]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- NSF [DMR-1644779]
- State of Florida
- National Science Foundation (NSF) Research Fellowship Program [DGE-1324585]
- NSF DMREF Program [DMR-1629601, DMR-1629383]
- Department of Defense Air Force Office of Scientific Research [FA9550-15-1-0099]
- National Science Foundation [DMR-1710104]
- NSF Earth Sciences [EAR-1634415]
- DOE, Geosciences [DE-FG02-94ER14466]
- NSF-MRI [EAR-1531583]
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Excimers, a portmanteau of excited dimer, are transient species that are formed from the electronic interaction of a fluorophore in the excited state with a neighbor in the ground state, which have found extensive use as laser gain media. Although common in molecular fluorophores, this work presents evidence for the formation of excimers in a new class of materials: atomically precise two-dimensional semiconductor nanoplatelets. Colloidal nanoplatelets of CdSe display two-color photoluminescence resolved at low temperatures with one band attributed to band-edge fluorescence and a second, red band attributed to excimer fluorescence. Previously reasonable explanations for two-color fluorescence, such as charging, are shown to be inconsistent with additional evidence. As with excimers in other materials systems, excimer emission is increased by increasing nanoplatelet concentration and the degree of cofacial stacking. Consistent with their promise as low-threshold gain media, amplified spontaneous emission emerges from the excimer emission line.
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