NIR-Emitting Colloidal Quantum Dots Having 26% Luminescence Quantum Yield in Buffer Solution

Hinds, Sean; Myrskog, Stefan; Levina, Larissa; Koleilat, Ghada I.; Yang, Jun; Kelley, Shana O.; Sargent, Edward H.

doi:10.1021/ja070525s

Cited by 92 publications

(93 citation statements)

References 11 publications

(18 reference statements)

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“…Compared with PbS OA , a remarkably reduced intensity of λ em at 1309 nm with a blue-shift by 245 nm is observed in PbS Cys QDs (Figure 6b). According to previous studies2432, PL intensity showed a strong surface dependence and thus was sensitive to the structure of ligands. Furthermore, during the phase transfer, oxidative etching of QD surface occurred because of the existence of oxygen in solution25.…”

Section: Resultsmentioning

confidence: 63%

A layer-nanostructured assembly of PbS quantum dot/multiwalled carbon nanotube for a high-performance photoswitch

Feng

Qin

Shen

et al. 2014

Sci Rep

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A layered nanostructure of a lead sulfide (PbS) quantum dot (QD)/multi-walled carbon nanotube (MWNT) hybrid was prepared by the electrostatic assembly after the phase transfer of PbS QDs from an organic to an aqueous phase. Well-crystallized PbS QDs with a narrow diameter (5.5 nm) was mono-dispersed on the sidewalls of MWNT by the electrostatic adsorption. Near-infrared absorption of PbS/MWNT nanostructures was improved and controlled by the packing density of PbS QDs. Efficient charge transfer between PbS and MWNT at the interface resulted in a remarkable quenching of photoluminescence up to 28.6% and a blue-shift of emission band by 300 nm. This feature was facilitated by band energy levels based on the intimate contact through the electrostatic interaction. Two-terminal devices using PbS/MWNT nanostructures showed an excellent on/off switching photocurrent and good stability during 20 cycles under light illumination due to electron transfer from PbS to MWNT. The photoswitch exhibited a high photo sensitivity up to 31.3% with the photocurrent of 18.3 μA under the light of 3.85 mW/cm2, which outperformed many QD/carbon-based nanocomposites. Results indicate that the electrostatic layered assembly of QD/MWNT nanostructure is an excellent platform for the fabrication of high-performance optoelectronic devices.

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Section: Resultsmentioning

confidence: 63%

A layer-nanostructured assembly of PbS quantum dot/multiwalled carbon nanotube for a high-performance photoswitch

Feng

Qin

Shen

et al. 2014

Sci Rep

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“…Up to date, many kinds of QDs with different size, shape, and composition have been extensively investigated for not only their theoretical fundaments but also their practical applications [7][8][9]. As an important branch of QDs materials, the near-infrared emitting (NIR) QDs with emission range of 700-1300 nm are becoming increasingly attractive in the last 5 years [10][11][12]. This is because absorption and scattering by biological tissues is much reduced in this spectral window compared to the visible range.…”

Section: Introductionmentioning

confidence: 99%

Effect of ligands on the photoluminescence properties of water-soluble PbS quantum dots

Zhang

Sun

2013

Journal of Molecular Structure

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“…[2][3][4] PbSe and PbS nanocrystals have been shown to possess special properties [5][6][7] and can potentially be employed in numerous applications, such as infrared photovoltaics, [8][9][10] infrared LED, 11 and IR luminescence. [12][13][14] Various methods have been developed to synthesize PbSe and PbS nanocrystals, [15][16][17][18][19] but the obtained nanocrystals can not be used in device fabrication due to their bad size distribution or poor solubility in organic solvent. The hot-injection method may be the most effective approach to produce monodispersed and processable PbSe and PbS nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Size- and shape-controlled synthesis of PbSe and PbS nanocrystalsvia a facile method

Dong

et al. 2010

CrystEngComm

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The present study describes the synthesis of monodispersed PbSe and PbS nanocrystals by a facile, less hazardous and inexpensive approach. In this study, Se and S powder are used as chalcogenide precursors instead of trioctylphosphine-selenium (TOPSe) and hexamethyldisilthiane (TMS), which are toxic and expensive. The chalcogenide precursors used in this method are inexpensive and air-stable, which not only reduces the cost of the experiment, but also simplifies the synthesis process. Monodispersed PbSe and PbS nanocrystals with spherical, cubic and cuboctahedral shapes were obtained, and the size of the nanocrystals can be tuned in a wide range (6-25 nm for PbSe and 10-80 nm for PbS) via tuning the concentration of oleic acid (OA) and oleyamine (OAm). The mechanism of the size control and shape evolution is discussed. The concentration of OA and OAm is found to play an important role in deciding the size and shape of the nanocrystals in the nucleation and growth process.

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NIR-Emitting Colloidal Quantum Dots Having 26% Luminescence Quantum Yield in Buffer Solution

Abstract: We report PbS quantum dot lumophores emitting in the near-infrared. The lumophores are stable for at least 5 days stored in physiologically relevant pH 6−8 buffer, have sub-10 nm hydrodynamic diameter, and exhibit 26% quantum yield.

Cited by 92 publications

References 11 publications

A layer-nanostructured assembly of PbS quantum dot/multiwalled carbon nanotube for a high-performance photoswitch

A layer-nanostructured assembly of PbS quantum dot/multiwalled carbon nanotube for a high-performance photoswitch

Effect of ligands on the photoluminescence properties of water-soluble PbS quantum dots

Size- and shape-controlled synthesis of PbSe and PbS nanocrystalsvia a facile method

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