Journal
PHYSICAL REVIEW B
Volume 81, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.073401
Keywords
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Funding
- NSF [DMR-0531171]
- NSF-EPSCoR
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Using time-resolved photoluminescence spectroscopy, we studied the electronic levels of semiconductor nanocrystals (NCs) with small spin-orbit coupling such as CdS. Low temperature radiative lifetimes indicate that the lowest-energy transition changes from orbital allowed to orbital forbidden with decreasing NC size. Our results are well explained by a size-dependent hierarchy of s- and p-orbital hole levels that is in agreement with theoretical predictions. Around the critical NC radius of similar to 2 nm we observe an anticrossing of s- and p-orbital hole levels and large changes in transition rates.
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