Photo-assisted synthesis of highly fluorescent ZnSe(S) quantum dots in aqueous solution

Guo Yu Lan, Yang-Wei Lin, Yu Fen Huang, Huan Tsung Chang

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Abstract

This paper describes the synthesis of highly water-soluble and fluorescent ZnSe(S)-alloyed quantum dots (QDs). We used zinc perchlorate hexahydrate, sodium hydrogen selenide as precursors and mercaptopropionic acid as stabilizer to synthesize ZnSe QDs in aqueous solution at 160 °C for 9 h. The as-prepared ZnSe QDs possess a quantum yield (QY) of 8.1% and high trapped emission. After UV irradiation using a 100 W Hg-Xe lamp for 0.5 h, ZnSe(S) QDs having a QY of 19.0% are formed from ZnSe QDs. However, aggregation of ZnSe(S) QDs under longer UV irradiation (> 0.5 h) takes place, leading to instability and irreproducibility. To overcome this, additional thiol compounds (mercaptopropionic acid, mercaptosuccinic acid, 11-mercaptoundecanoic acid, and thioglycolic acid) were separately added to ZnSe QD solutions during UV irradiation. UV irradiation and oxygen accelerate the release of S2- from the thiol compounds, leading to the formation of ZnSe(S) QDs. Among the thiol compounds, mercaptosuccinic acid is the most suitable in terms of stability and photoluminescence intensity. We suggest that the size and functional group of the thiol compounds play an important role in determining the optical properties and stability of ZnSe(S) QDs. The as-prepared ZnSe(S) QDs fluoresce strongly (QY up to 44.0%) at 407 nm with a narrow bandwidth (W 1/2 < 25 nm) when excited at 325 nm.

Original languageEnglish
Pages (from-to)2661-2666
Number of pages6
JournalJournal of Materials Chemistry
Volume17
Issue number25
DOIs
Publication statusPublished - 2007 Jan 1

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Semiconductor quantum dots
Sulfhydryl Compounds
Acids
Quantum yield
Irradiation
Electric lamps
Functional groups
Zinc
Photoluminescence
Agglomeration
Optical properties
Sodium
Oxygen
Bandwidth
Hydrogen
Water

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Lan, Guo Yu ; Lin, Yang-Wei ; Huang, Yu Fen ; Chang, Huan Tsung. / Photo-assisted synthesis of highly fluorescent ZnSe(S) quantum dots in aqueous solution. In: Journal of Materials Chemistry. 2007 ; Vol. 17, No. 25. pp. 2661-2666.
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Photo-assisted synthesis of highly fluorescent ZnSe(S) quantum dots in aqueous solution. / Lan, Guo Yu; Lin, Yang-Wei; Huang, Yu Fen; Chang, Huan Tsung.

In: Journal of Materials Chemistry, Vol. 17, No. 25, 01.01.2007, p. 2661-2666.

Research output: Contribution to journalArticle

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