Relaxation and trapping of excitons in J-aggregates of a thiacarbocynine dye

Drobizhev, Mikhail; Sapozhnikov, M. N.; Scheblykin, Ivan G.; Varnavsky, O.P.; Auweraer, Mark Van der; Vitukhnovsky, A. G.

doi:10.1016/0301-0104(96)00134-6

Cited by 42 publications

(41 citation statements)

References 41 publications

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“…Thus, the formation of two types of H-aggregates and of two types of J-aggregates was reported [122], and spontaneous transition from J-to H-aggregates can be mediated by the variation of solvent [123]. Four spectrally distinct J-aggregates of 3,3′,9-triethyl-5,5′-dichlorothiacarbocyanine iodide (TDC) dye were found in cryogenic experiment [69]. Kinetic studies do not always reveal dimers as the intermediates in J-aggregate formation indicating a direct transition from the monomer to the aggregate state [124].…”

Section: Self-assembly Of Dyes To Form J-aggregatesmentioning

confidence: 99%

“…The narrow fluorescence bands with slight Stokes shifts observed in the majority of experiments are commonly attributed to the emission of free excitons. However, the noticeable contributions of self-trapped excitons originating from significant exciton-phonon coupling can be observed only in low-temperature studies [41,69]. It was shown that they modulate significantly the temperature dependence of radiative lifetimes [66].…”

Section: Excitons In Dye Aggregatesmentioning

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.

323

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: Self-assembly Of Dyes To Form J-aggregatesmentioning

confidence: 99%

Section: Excitons In Dye Aggregatesmentioning

confidence: 99%

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

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

323

299

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“…Many years ha passed as the self-trapping concept was again exploited for the analysis of data concerning J-aggregate spectroscopy. The self-trapping idea was used to explain the Stokes shift (~100 cm -1 ) of THIATS J-aggregates luminescence [22]. But later, the authors [23] rejected this idea and declared the absence of exciton selftrapping.…”

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confidence: 98%

Coexistence of free and self‐trapped excitons in disordered J‐aggregates

Malyukin

2006

Phys. Status Solidi (c)

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PACS 71.35.AaCoexistence of free and self-trapped exciton in amphi-PIC J-aggregates is proved by the numerous experimental data presented and analyzed. The self-trapping states are shown to originate from delocalized exciton states exhibiting collective nature of polaronic relaxation. The strong correlation between the efficiency of exciton self-trapping and static disorder degree in J-aggregates has been shown. In amphi-PIC J-aggregates the polaronic state formation found out to require the overcoming an energy barrier which appears for quasi-one-dimension system as a result of combination of one-dimensional exciton motion and three-dimension lattice deformation. [16,17]. Despite relatively long history of J-aggregate investigation, some questions concerning exciton dynamics governed by polaronic relaxation are not fully understood.In many cases the absorption and luminescence properties of J-aggregates are well described within the one-dimensional Frenkel exciton model for a rigid chain with static disorder [1][2][3][4][5][6]. But, the chain could be deformable and if the constant of exciton-lattice coupling is strong enough, the exciton can create a chain distortion that produces a new polaronic state below the exciton band bottom. This phenomenon is called self-trapping [18]. The self-trapping pattern of the exciton interacting with a lattice via short-range potential depends strongly on the exciton motion dimension [19][20][21]. According to the Rashba-Toyozava theory, the excitons characterized by one-dimensional motion are always self-trapped. So, free excitons are unstable irrespective of the magnitude of exciton-lattice coupling and there is no any energy barrier which separates free and self-trapped exciton states [18][19][20][21]. The spatial extension of

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“…1, a) and its J-aggregates. This dye is well-known to form different kinds of J-aggregates in solution [10] [11] as well as in LB [12] and selfassembled [13] [14] films. The choice of THIATS allowed us to prepare a stable solution of J-aggregates and pre-PPV in H 2 O, while it was not possible for the dye 5,5',6,6'-tetrachloro-1,1'-diethyl-3,3'-bis(4-sulfobutyl)benzimidazolocarbocyanine (TDBC) [15] [16] due to incompatibility of the pH of the mixed compounds.…”

mentioning

confidence: 99%

“…of the positively charged pre-PPV was found to cause extensive aggregation. Upon mixing, the maximum of the absorption spectrum shifted from 550 nm, corresponding to dye monomers in H 2 O, to 625 nm, which is absorption band typical of J-aggregates [10], while the width of the band was reduced to 10 ± 15 nm (250 ± 400 cm À1 ). In this solution, J-aggregates revealed a high fluorescence quantum yield of ca.…”

mentioning

confidence: 99%

On the Complementary Photoluminescent and Electroluminescent Images of Poly(phenylenevinylene)-Based Light-Emitting Diodes with a Thin Active Layer

Scheblykin

Архипов

Auweraer

et al. 2001

HCA

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Dedicated to Professor Andre¬ M. Braun on the occasion of his 60th birthday A clear complementary relationship between photoluminescent (PL) and electroluminescent (EL) images was observed for organic light-emitting diodes (OLEDs) based on poly(phenylenevinylene) (PPV) and dyedoped PPV. So-called −black spots× (dark circular regions observed on the active area of running OLEDs) become bright ones, when the photoluminescence of the same area is excited. A very small thickness of the active layer (ca. 10 nm) was the crucial point to observe this anticorrelation between EL and PL. A substantial increase of the PL yield (−anti-burning× effect) was observed after strong light exposure (ca. 10 mJ/cm 2 ) of the polymer covered by an aluminium layer. The same light exposure without aluminium protection resulted in complete photobleaching of the polymer. The presence of a thin insulating layer between the polymer and aluminium was proposed to be responsible for these effects. This layer prevents electron injection and PL quenching due to exciton dissociation at the metal-polymer interface. The former effect leads to black spots in the EL image, the latter one gives rise to bright spots on the PL image situated on the same places. The intermediate layer can be also induced by light exposure. A very efficient energy transfer from the polymer to the dye and to the J-aggregates of the dye was demonstrated in PPV/dye composite films.

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Relaxation and trapping of excitons in J-aggregates of a thiacarbocynine dye

Cited by 42 publications

References 41 publications

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

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

Coexistence of free and self‐trapped excitons in disordered J‐aggregates

On the Complementary Photoluminescent and Electroluminescent Images of Poly(phenylenevinylene)-Based Light-Emitting Diodes with a Thin Active Layer

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