Photoluminescence quantum yield of CdSe-ZnS/CdS/ZnS core-multishell quantum dots approaches 100% due to enhancement of charge carrier confinement

Samokhvalov, Pavel; Linkov, Pavel; Michel, Jean; Molinari, Michaël; Nabiev, Igor

doi:10.1117/12.2040196

Cited by 29 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The quantum yield of luminescence is close to unity for dyes injected into PMMA [8] and reaches 88.5% for In(Zn)P/ZnS quantum dots [29]. For CdSe-ZnS/CdS/ZnS QDs, the quantum yield is close 100% (the quantum luminescence output already reaches 97%) [30].…”

Section: Organic Plasticsmentioning

confidence: 71%

Photoconverter with luminescent concentrator. Matrix material

Kulish¹

2019

Semicond. Phys. Quantum Electron. and Optoelectron.

View full text Add to dashboard Cite

Materials, promising for production of luminescent solar energy concentrators were considered. It is known that the silicon oxide matrix is transparent within the spectral range where Sun emits light. Up to date, the low-temperature sol-gel method for synthesizing SiO 2 coatings with the simultaneous doping of the material with quantum dots (QDs) is developed. The transmission spectrum of borosilicate glasses (BK7) is narrower than that of SiO 2. Typically, the doping of BK7 with the quantum dots of the group A II B VI is carried out using the method of condensation at high temperatures, which results in a low value of the quantum yield of luminescence. Minimal losses of luminescent quanta through the leakage cone will be in the matrix of glass LASF35 022291.541, which refractive index is 2.022. In the research of the properties of photoconductors with a luminescent concentrator, the matrix is most often made of polymethylmethacrylate (PMMA). Its doping with QDs and dyes is well developed. The quantum yield of luminescence of luminophores when doping PMMA with dyes and QDs is close to unity. The magnitude of losses of luminescent quanta in matrices of glass, PMMA and silica has been estimated. Dependence of these losses in the wave range, which should be taken into account in the study of stacked fluorescent concentrators, has been analyzed.

show abstract

Section: Organic Plasticsmentioning

confidence: 71%

Photoconverter with luminescent concentrator. Matrix material

Kulish¹

2019

Semicond. Phys. Quantum Electron. and Optoelectron.

View full text Add to dashboard Cite

show abstract

“…"Giant" shell allows to suppress Auger recombination, and thus to escape large nonradiative losses and to minimize fluorescence intermittency ("blinking") from single nanocrystals [26,27]. MS shell, as we have shown previously, provides high localization of charges inside fluorescent cores at a relatively low shell thickness [25]. …”

Section: Methodsmentioning

confidence: 91%

“…3) was synthesized starting from acridine by following the general procedures described in [12] purified cores [23] with different types of shells using the SILAR approach [24,25]. This method allows growing given number of shell layers in the layer-by-layer regime with highest possible precision.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Quantum Dot Shell Structure on Fluorescence Quenching By Acridine Ligand

Linkov¹,

Vokhmintcev²,

Samokhvalov³

et al. 2018

KEn

View full text Add to dashboard Cite

The current strategy for the development of advanced methods of tumor treatment focuses on targeted drug delivery to tumor cells. Quantum dot (QD) -semiconductor fluorescent nanocrystal, conjugated with a pharmacological ligand, such as acridine, ensures real-time tracking of the delivery process of the active substance. However, the problem of QD fluorescence quenching caused by charge transfer can arise in the case when acridine is bound to the QD. We found that QD shell structure has a defining role on photoinduced electron transfer from QD on acridine ligand which leads to quenching of QD photoluminescence. We have found that multishell CdSe/ZnS/CdS/ZnS QD structure provides minimal reduction of photoluminescence quantum yield at minimal shell thickness compared to classical thin ZnS or "giant" shells. Thus, CdSe/ZnS/CdS/ZnS core/multishell QD could be an optimal choice for engineering of small-sized acridine-based fluorescent labels for tumor diagnosis and treatment systems.

show abstract

“…In the present study, we demonstrate the growth of a SiO 2 shell with predetermined parameters on CdSe/ZnS/CdS/ZnS core/multishell (CdSe/MS) QDs [9]. The accuracy of the procedure is ensured by two main factors.…”

Section: Introductionmentioning

confidence: 91%

“…Synthesis of CdSe/MS "core/multishell" QDs with an emission peak at 610 nm was performed as reported in Ref. [9]. Briefly, 3.5-nm CdSe cores were synthesized by the hot injection method using n-hexadecylphosphonic acid as a capping ligand.…”

Section: Synthesis Of Cdse/ms Quantum Dotsmentioning

confidence: 99%