期刊
JOURNAL OF LUMINESCENCE
卷 128, 期 12, 页码 1948-1951出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2008.06.004
关键词
Quantum dots; Photoluminescence; Aggregation; Lifetime
类别
资金
- National Natural Science Foundation of China [60638010, 10774027]
- Shanghai Municipal Science and Technology Commission [06ZR14005]
- Graduate Innovation Fund of Fudan University [EYH1206005]
pH-dependent aggregation of thiol-capped CdTe quantum dots (QDs) in solutions was observed with a confocal microscope. The average size of the QD aggregates increased from 28 nm to 1.4 mu m as the pH decreased from 12 to 3. The basic condition improved the dispersion of QDs while the acidic condition caused the detachment of surface ligands, leading to the aggregation of QDs. A PL lifetime of 80 ns was detected for QDs at pH from 12 to 7, while it was shortened to 57 and 34 ns at pH 5 and 3, respectively, due to the formation of surface defects. (c) 2008 Elsevier B.V. All rights reserved.
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