Encapsulation of highly confined CdSe quantum dots for defect free luminescence and improved stability

Kumari, Asha; Singh, Ragini Raj

doi:10.1016/j.physe.2017.01.031

Cited by 27 publications

(8 citation statements)

References 34 publications

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“…5) the second emission band has always the larger relative amplitude, a characteristic which does not necessarily implies its identification as the band edge emission from the core (examples for thiol-CdSe in Ref. [65] and [66]). For identifying the band edge emission, we followed the rule of its dependence with the MSA-CdSe QDs size [59,67] with same capping ligand, which is parallel to the dependence of the first excitonic absorption peak with the size [59,67].…”

Section: Emission Spectrummentioning

confidence: 99%

Tailoring the photophysical properties and excitonic radiative decay of soluble CdSe quantum dots by controlling the ratio of capping thiol ligand

et al. 2019

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Section: Emission Spectrummentioning

confidence: 99%

Tailoring the photophysical properties and excitonic radiative decay of soluble CdSe quantum dots by controlling the ratio of capping thiol ligand

et al. 2019

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“…Because nanomaterials exhibit unusual properties at the 0D level, they have become a promising area of research. In nanoscale structures, such as nanoclusters and nano dispersions, central shelled structures, quantum wells, and quantum nodes are the most common 0D heterostructures [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

MgO Heterostructures: From Synthesis to Applications

et al. 2022

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The energy storage capacity of batteries and supercapacitors has seen rising demand and problems as large-scale energy storage systems and electric gadgets have become more widely adopted. With the development of nano-scale materials, the electrodes of these devices have changed dramatically. Heterostructure materials have gained increased interest as next-generation materials due to their unique interfaces, resilient structures and synergistic effects, providing the capacity to improve energy/power outputs and battery longevity. This review focuses on the role of MgO in heterostructured magnetic and energy storage devices and their applications and synthetic strategies. The role of metal oxides in manufacturing heterostructures has received much attention, especially MgO. Heterostructures have stronger interactions between tightly packed interfaces and perform better than single structures. Due to their typical physical and chemical properties, MgO heterostructures have made a breakthrough in energy storage. In perpendicularly magnetized heterostructures, the MgO’s thickness significantly affects the magnetic properties, which is good news for the next generation of high-speed magnetic storage devices.

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“…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 . A significant influence of the non-stoichiometry of the compound from which QDs [11][12][13][14][15][16][17][18] were synthesized was noted. Photodegradation of IR luminescence has been repeatedly observed in colloidal Ag 2 S QDs, the composition of which has a high degree of non-stoichiometry [21][22][23][24][25][26][27][28].…”

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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Encapsulation of highly confined CdSe quantum dots for defect free luminescence and improved stability

Cited by 27 publications

References 34 publications

Tailoring the photophysical properties and excitonic radiative decay of soluble CdSe quantum dots by controlling the ratio of capping thiol ligand

Tailoring the photophysical properties and excitonic radiative decay of soluble CdSe quantum dots by controlling the ratio of capping thiol ligand

MgO Heterostructures: From Synthesis to Applications

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

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