Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.157403
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Funding
- Department of Energy [DE-FG02-07ER46454]
- NSF MRSEC [NSF-DMR-0213282]
- NIH [P41 RR02594]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001088]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819762] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-07ER46454] Funding Source: U.S. Department of Energy (DOE)
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Semiconductor nanocrystals emit light intermittently; i.e., they blink,'' under steady illumination. The dark periods have been widely assumed to be due to photoluminescence (PL) quenching by an Auger-like process involving a single additional charge present in the nanocrystal. Our results challenge this long-standing assumption. Close examination of exciton PL intensity time traces of single CdSe(CdZnS) core (shell) nanocrystals reveals that the dark state PL quantum yield can be 10 times less than the biexciton PL quantum yield. In addition, we observe spectrally resolved multiexciton emission and find that it also blinks with an on/off ratio greater than 10:1. These results directly contradict the predictions of the charging model.
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