| Effect of Mercaptocarboxylic Acids on Luminescent Properties of CdTe Quantum Dots. | |
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MedLine Citation:
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PMID: 21850430 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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CdTe quantum dots (QDs) were prepared in an aqueous solution using various mercaptocarboxylic acids, such as 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA), as stabilizing agents. The experimental result indicated that these stabilizing agents played an important role for the properties of the QDs. Although both TGA and MPA-capped CdTe QDs exhibited the tunable photoluminescence (PL) from green to red color, the TGA-capped QDs revealed a higher PL quantum yield (QY) up to 60% than that of MPA-capped QDs (up to 50%) by using the optimum preparation conditions, such as a pH value of ~11.2 and a TGA/Cd molar ratio of 1.5. PL lifetime measurements indicate that the TGA-capped QDs exhibited a short average lifetime while the MPA-capped QDs revealed a long one. Furthermore, the average lifetime of the TGA-capped QDs increased with the increase of the QDs size, while a decreased lifetime for the MPA-capped QDs was obtained. This means that the PL lifetime depended strongly on the surface state of the CdTe QDs. These results should be utilized for the preparation and applications of QDs. |
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Authors:
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Zhimin Yuan; Aiyu Zhang; Yongqiang Cao; Jie Yang; Yuanna Zhu; Ping Yang |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-8-18 |
Journal Detail:
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Title: Journal of fluorescence Volume: - ISSN: 1573-4994 ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-8-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9201341 Medline TA: J Fluoresc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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School of Material Science and Engineering, University of Jinan, 250022, Jinan, People's Republic of China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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