期刊
NANO LETTERS
卷 11, 期 7, 页码 2887-2891出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201351f
关键词
Quantum dot; ligand exchange; energy transfer; lead sulfide; quantum efficiency
类别
资金
- AFOSR [FA9550-08-1-0146]
We present a new approach to ligand exchange on lead sulfide (PbS) quantum dots (QDs) in which the QDs are reacted with preformed Pb cation-ligand exchange units designed to promote reactions that replace surface Pb and oleate groups on the as-grown QDs. This process introduces negligible surface defects as the high quantum efficiency (similar to 55%) of the as-grown QDs is maintained. Infrared spectroscopy and electron microscopy are used to confirm the replacement of ligands and time-resolved photoluminescence to demonstrate the expected inverse sixth power dependence of the nonradiative resonant energy transfer rate on inter-QD spacing.
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