Optoelectronic Applications of Colloidal Quantum Dots

Wang, Zhiping; Zhang, Nanzhu; Brenneman, Kimber; Wu, Tsai Chin; Jung, Hyeson; Biswas, Shyamal; Sen, Banani; Reinhardt, Kitt; Liao, Sicheng; Stroscio, Michael A.; Dutta, Mitra

doi:10.1007/978-1-4614-3570-9_15

Cited by 4 publications

(2 citation statements)

References 67 publications

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“…These include radiation detectors, emitters, photocatalytic and sensor systems, luminescent markers [1][2][3][4][5][6][7][8][9][10]. One of the fundamental problems that arise in the way of the applied use of QDs in applications based on luminescence is its degradation under the action of photoexciting quanta .…”

Section: Introductionmentioning

confidence: 99%

Photostability of luminescence of Ag-=SUB=-2-=/SUB=-S quantum dots and Ag-=SUB=-2-=/SUB=-S/SiO-=SUB=-2-=/SUB=- core/shell structures

I.G.

O.V.

M.S.

et al. 2022

Optics and Spectroscopy

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The paper presents regularities that demonstrate the effect of passivating ligands formation of thioglycolic acid and L-cysteine (TGA, L-Cys) and dielectric shells (SiO2) on Ag2S nanocrystals interface on the photostability of their IR luminescence. Using FTIR absorption spectroscopy, the interaction manifestations of passivating ligands molecules of TGA and L-Cys with Ag2S nanocrystals, as well as the formation of SiO2 shell due to the process of replacing organic ligands with a silica ligand (MPTMS) ("ligand exchange"), were found. In the case of replacing TGA with MPTMS, an increase in the luminescence quantum yield of Ag2S quantum dots (QDs) and its resistance to long-term exposure to exciting radiation was found. In the case of replacing L-Cys with MPTMS, the formation of a fragmentary SiO2/L-Cys shell on Ag2S nanocrystals was observed due to the partial replacement of L-Cys with MPTMS, which contributes to the reverse photodegradation of KT Ag2S luminescence of as a result of SiO2/L-Cys shell photodestruction. Keywords: photoluminescence, luminescence photostability, quantum yield, quantum dot, core/shell structures, FTIR spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Photostability of luminescence of Ag-=SUB=-2-=/SUB=-S quantum dots and Ag-=SUB=-2-=/SUB=-S/SiO-=SUB=-2-=/SUB=- core/shell structures

I.G.

O.V.

M.S.

et al. 2022

Optics and Spectroscopy

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“…Numerous unique properties of semiconductor quantum dots (QDs) − enable QD utilization for photovoltaics, , waveguides, − and fluorescent biolabels . In the latter role, QDs are used for studies of living cells, for example, as agents for drug delivery into the cell and/or for monitoring the conditions inside the cell. − The variety of applications makes profound investigations of the mechanisms of the QD fluorescence highly important.…”

Section: Introductionmentioning

confidence: 99%

Three Ligands with Biomedical Importance: Binding to Small ZnS Quantum Dots

Balaeff

Kuznetsov

2018

J. Phys. Chem. C

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We have performed the first systematic density functional theory study of the coordination of three biomedically significant ligands, acetylcysteine, dihydrolipoic acid, and dopamine, to a small quantum dot (QD), Zn6S6. An exhaustive search for the global minima structures of the ligands and of the ligand–QD species identified several isomers of each compound close in energy to the global minimum structures. The isomeric variety is explained by the presence of several functional groups in the ligands and thus by numerous possibilities of their coordination to the QD. The global minimum structures of the three ligand–QD complexes were further studied with a larger basis set and implicit water effects. The three complexes were shown to be stable, with the anionic ligand species coordinated to the QD being generally more stable than the neutral compounds. The QD distortions because of the coordination with the anionic ligands were much more pronounced than those with the neutral ligands. Charge transfer from both the neutral and anionic ligands to the QD upon the ligand coordination was detected.

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