Reversible photoluminescence quenching of CdSe/ZnS quantum dots embedded in porous glass by ammonia vapor

Орлова, А. О.; Gromova, Yulia; Маслов, В. Г.; Andreeva, O. V.; Баранов, А. В.; Fedorov, Anatoly V.; Prudnikau, Anatol; Artemyev, Mikhail; Berwick, Kevin

doi:10.1088/0957-4484/24/33/335701

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…Another important advantage of NSMs is that they allow a controlled variation of the pore diameter, opening the possibility of size-selective infiltration of QDs and study of the optical properties of both isolated and close-packed QDs. Several applications of NSMs filled by various nanoparticles such as fullerene-based optical limiters, 19 Ag−AgI-based hybrid "plasmon−exciton" nanostructures, 20 and ammonia vapor sensors 21 have been reported recently.…”

Section: ■ Introductionmentioning

confidence: 99%

Photoluminescence of Lead Sulfide Quantum Dots of Different Sizes in a Nanoporous Silicate Glass Matrix

et al. 2017

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The optical properties of lead sulfide quantum dots (QDs) of different sizes embedded in a nanoporous silicate glass matrix (NSM) are investigated by steady-state and transient photoluminescence spectroscopy. The use of this matrix allows the fabrication of samples with reproducible optical characteristics, for both isolated and close-packed QDs. Low-temperature PL analysis of isolated QDs with sizes of 3.7 and 4.5 nm shows that the coefficient of temperature shift of the PL position changes sign with reducing QD size because of size-dependent contributions from thermal expansion, mechanical strain, and electron–phonon coupling. The PL intensity is determined by size-dependent splitting of the lowest energy electronic state.

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Section: ■ Introductionmentioning

confidence: 99%

Photoluminescence of Lead Sulfide Quantum Dots of Different Sizes in a Nanoporous Silicate Glass Matrix

et al. 2017

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“…This facilitates the formation of highly luminescent QD distributions that are surface bound but still largely accessible for surface modification studies. Using the QD-PSiO 2 platform, we can study QD radiation sensitivity on a solid surface that mimics a potential device configuration while preventing inter-QD exciton couplings that may otherwise encourage other avenues for nonradiative exciton annihilation and interfere with conclusions that are drawn purely from radiation induced changes in exciton dynamics. − Here, a sub-monolayer of CdTe/CdS QDs (Figure S1) are electrostatically attached within a 10 μm thick PSiO 2 framework (Figures S2–S5), although other types of QDs could be similarly studied using this approach. We show that cumulative 10 keV X-ray irradiation of the QD-PSiO 2 samples in air from 2.2 Mrad(SiO 2 ) to 6.6 Mrad(SiO 2 ) leads to an exponential decrease in QD peak emission intensity and a concurrent exponential blue-shift of the QD peak emission to higher energies due to accelerated photo-oxidative effects.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ionizing Radiation and the Role of Thiol Ligands on the Reversible Photodarkening of CdTe/CdS Quantum Dots

Gaur

Koktysh

Fleetwood

et al. 2016

ACS Appl. Mater. Interfaces

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We investigate the influence of high energy photons and thiol ligands on the photophysical properties of sub-monolayer CdTe/CdS quantum dots (QDs) immobilized in porous silica (PSiO2) scaffolds. The highly disperse, uniform distributions of QDs in a three-dimensional PSiO2 framework ensure uniform interaction of not only radiation but also subsequent surface repassivation solutions to all immobilized QDs. The high optical densities of QDs achieved using PSiO2 enable straightforward monitoring of the QD photoluminescence intensities and carrier lifetimes. Irradiation of QDs in PSiO2 by high energy photons, X-rays, and γ-rays leads to dose-dependent QD photodarkening, which is accompanied by accelerated photooxidative effects in ambient environments that give rise to blue-shifts in the peak QD emission wavelength. Irradiation in an oxygen-free environment also leads to QD photodarkening but with no accompanying blue-shift of the QD emission. Significant reversal of QD photodarkening is demonstrated following QD surface repassivation with a solution containing free-thiols, suggesting reformation of a CdS shell, etching of surface oxidized species, and possible reduction of photoionized dark QDs to a neutral, bright state. Permanent lattice displacement damage effects may contribute toward some irreversible γ radiation damage. This work contributes to an improved understanding of the influence of surface ligands on the optical properties of QDs and opens up the possibilities of engineering large area, low-cost, reuseable, and flexible QD-based optical radiation sensors.

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“…Orlova A. et al . 48 demonstrated that the exposure of the porous glass samples with embedded CdSe/ZnS QDs to ammonia vapor results in effective quenching of the QD PL and a reduction in the average PL decay time due to the formation of QD/ammonia complexes on the surface of the CdSe/ZnS QDs. The transition from isolated QDs to superstructures based on them could lead to an enhancement of the sensor performance.…”

Section: Resultsmentioning

confidence: 99%

Porous flower-like superstructures based on self-assembled colloidal quantum dots for sensing

Stepanidenko

Gromova

Kormilina

et al. 2019

Sci Rep

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Quantum dots (QDs) have been envisaged as very promising materials for the development of advanced optical sensors. Here we report a new highly porous luminescent material based on colloidal QDs for potential applications in optical sensing devices. Bulk flower-like porous structures with sizes of hundreds of microns have been produced by slow destabilization of QD solution in the presence of a non-solvent vapor. The porous highly luminescent material was formed from CdSe QDs using the approach of non-solvent destabilization. This material demonstrated a 4-fold decrease in PL signal in the presence of the ammonia vapor. The relationship between the destabilization rate of QDs in solution and the resulting morphology of structural elements has been established. The proposed model of bulk porous flower-like nanostructured material fabrication can be applied to nanoparticles of different nature combining their unique properties. This research opens up a new approach to design novel multi-component composite materials enabling potential performance improvements of various photonic devices.

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Reversible photoluminescence quenching of CdSe/ZnS quantum dots embedded in porous glass by ammonia vapor

Cited by 14 publications

References 21 publications

Photoluminescence of Lead Sulfide Quantum Dots of Different Sizes in a Nanoporous Silicate Glass Matrix

Photoluminescence of Lead Sulfide Quantum Dots of Different Sizes in a Nanoporous Silicate Glass Matrix

Influence of Ionizing Radiation and the Role of Thiol Ligands on the Reversible Photodarkening of CdTe/CdS Quantum Dots

Porous flower-like superstructures based on self-assembled colloidal quantum dots for sensing

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