Electrostatic Formation of Quantum Dot/J-aggregate FRET Pairs in Solution

Halpert, Jonathan E.; Tischler, Jonathan R.; Nair, Gautham; Walker, Brian; Liu, Wenhao; Bulović, Vladimir; Bawendi, Moungi G.

doi:10.1021/jp8099169

Cited by 77 publications

(106 citation statements)

References 49 publications

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“…This can be realized with the same QDs and the J-aggregates of different dyes making the possibility to have many acceptors with emission of different colors in the designed nanocomposites ( figure 14). The efficient FRET is observed even though the QDs and J-aggregates were separated by long ligands or amphiphilic polymers [168]. With short polymer linkers the energy transfer efficiency may approach unity [217].…”

Section: J-aggregates As Fret Acceptorsmentioning

confidence: 99%

“…Fine pH-dependent rearrangement of J-aggregate structure leads to the increased number of participating molecules and to the increased coherence domain of J-aggregate. Since these hybrid constructs combine the broadband UV absorption of colloidal QDs with the ultra-narrow emission band of J-aggregates [168,217] (see figure 14), these properties make such composites attractive for different applications.…”

Section: J-aggregates As Fret Acceptorsmentioning

confidence: 99%

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Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

329

299

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J-aggregates are fascinating fluorescent nanomaterials formed by highly ordered assembly of organic dyes with the spectroscopic properties dramatically different from that of single or disorderly assembled dye molecules. They demonstrate very narrow red-shifted absorption and emission bands, strongly increased absorbance together with the decrease of radiative lifetime, highly polarized emission and other valuable features. The mechanisms of their electronic transitions are understood by formation of delocalized excitons already on the level of several coupled monomers. Cyanine dyes are unique in forming J-aggregates over the broad spectral range, from blue to near-IR. With the aim to inspire further developments, this review is focused on the optical characteristics of J-aggregates in connection with the dye structures and on their diverse already realized and emerging applications.

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Section: J-aggregates As Fret Acceptorsmentioning

confidence: 99%

Section: J-aggregates As Fret Acceptorsmentioning

confidence: 99%

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

329

299

View full text Add to dashboard Cite

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“…The monomer band in the TTBC/PVA solution was blue-shifted compared with the monomer band in the electrospun fibers, probably as a result of the solvatochromic effects based on environmental change from solution to the solid phase. Halpert and co-workers 34 reported a blue shift of the J-band of TTBC molecules associated with CdSe/ZnS quantum dots (QD) with respect to that of aggregated TTBC in the absence of QDs. This difference was likely to be attributed to the size of the aggregates formed on the QDs and solvatochromic effects.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Hierarchial Coassembly of a Cyanine Dye in Poly(vinyl alcohol) Fibrous Films by Electrospinning

et al. 2013

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We report molecular aggregate formation of TTBC (1,1′,3,3′-tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine) in submicrometer-sized PVA (poly-(vinyl alcohol)) fibers by electrospinning. The formation of the molecular aggregate is examined by solution and instrumental parameters of electrospinning. The precursor solution of PVA/TTBC, in the range of 0.016−0.065 wt % is subjected to electrospinning under an electrical field ranging from 0.95 to 1.81 kV cm −1 . Both randomly deposited and uniaxially aligned fibers are achieved by using two parallelpositioned metal strips as counter electrode. Photoluminescence and polarized Fourier transform infrared spectroscopies are employed to determine spectral properties of the fibers. H-aggregates are formed within the electrospun fibers, regardless of their alignment, and H-and J-type aggregates coexist in the alternative spin-coated and the cast films. A strongly polarized photoluminescence emission is observed in the direction of uniaxially aligned fibers as a result of the orientation of the H-aggregates along the fiber axis. We demonstrate that electrospinning is a process capable of forming and orienting TTBC aggregates during the structural development of the polymer/dye nanofibers. These fibrous films may potentially find applications in optics and electronics. ■ INTRODUCTIONMolecular aggregates of dyes have attracted remarkable interest because they exhibit collective optical/excitonic properties with various functions. The strong coupling of transition dipoles of the constituent dye molecules which have internal molecular arrangement within the aggregate leads to delocalized excitonic states over a few to several molecules and, accordingly, the enhancement of the optical properties. 1 The aggregation patterns of the dye molecules exhibit red shift (J-type) and blue shift (H-type) in absorption bands. 2,3 TTBC is a twodimensional planar molecule that can form secondary interactions, yielding intriguing supramolecular structure. This cyanine dye undergoes both H-and J-type aggregation by shortrange noncovalent interactions, such as dipole−dipole interactions, π−π stacking, and hydrogen bonding. Aggregation is driven mainly by the presence of a strong transition dipole moment formed by conjugated π-electrons of the polymethine backbone of cyanine dyes. 4 The construction of sophisticated molecular dye assemblies and highly ordered dye aggregates plays a significant role in designing smart materials because their optical properties show alteration depending on the structural organization of the dyes. 5 The understanding of internal organization and controlling the mesoscopic morphology of cyanine aggregates has provided a powerful way of developing techniques for fabrication of functional structures designed for specific purposes. To date, a number of approaches have been demonstrated to form and align the aggregates, such as magnetic field, 6−9 vertical spin coating, 10−12 Langmuir−Blodgett films, 13,14 adsorption on a single crystal surface, 15,16 ...

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“…Normally, the formation of dye J-aggregates needs a scaffold, and such scaffolds could be polymer nanoparticles, quantum dots (Halpert et al 2009 ), macromolecules of DNA (Losytskyy et al 2002 ), see Fig. 4.6 , or protein molecules (Xu et al 2010 ).…”

Section: Excitonic Effectsmentioning

confidence: 99%

Fluorescent Nanocomposites

Demchenko¹

2015

Introduction to Fluorescence Sensing

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In previous Chapters we discussed different properties of fl uorescence emitters in order to understand them and optimize them adapting for different sensing and imaging technologies. New unlimited possibilities are offered by composing the nanocomposites formed of different types of emitters. They display a variety of novel useful features and thus extend dramatically the information content of output data. Researcher can design them from different types of luminophores of molecular and nanoscale origin (Fig. 6.1 ), manipulating with their connection, interaction, formation of new surfaces and interfaces. Their fl uorescence response can be modulated by electronic conjugation or by excited-state resonance energy transfer and coupled with other functionalities on nanoscale level.The luminescent molecules and nanoparticles can serve as building blocks for achieving versatile functions that are not observed in separate emitters alone. These larger nanocomposites demonstrate dramatically increased brightness, the ability to

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Electrostatic Formation of Quantum Dot/J-aggregate FRET Pairs in Solution

Cited by 77 publications

References 49 publications

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Hierarchial Coassembly of a Cyanine Dye in Poly(vinyl alcohol) Fibrous Films by Electrospinning

Fluorescent Nanocomposites

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