Polymerisation und polymere Adsorption als Ursache neuartiger Absorptionsbanden von organischen Farbstoffen

Scheibe, G.; Kandler, L.; Ecker, H.

doi:10.1007/bf01493278

Cited by 137 publications

(65 citation statements)

References 4 publications

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“…Soon after the discovering and assigning their fluorescence to molecular aggregates [5], Scheibe and Kandler [6] showed in flow linear dichroism experiments that the direction of their absorption dipole is parallel to the aggregate axis. From this result, Förster [7] concluded that the monomers in J-aggregate are aligned parallel (or slightly inclined) to the aggregate direction.…”

Section: Introductionmentioning

confidence: 99%

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

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

341

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: Introductionmentioning

confidence: 99%

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

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

341

299

View full text Add to dashboard Cite

show abstract

“…J‐aggregrates, or Jelley aggregrates to give them their full name, were discovered independently by Scheibe et al. , and Jelley in 1937 . J‐aggregrates are essentially dye clusters with an absorption band that can be shifted.…”

Section: Plasmonic‐based Devicesmentioning

confidence: 99%

Optical trapping and manipulation of micrometer and submicrometer particles

Daly¹,

Σεργίδης²,

Chormaic³

2015

Laser & Photonics Reviews

123

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Subwavelength features in conjunction with light‐guiding structures have gained significant interest in recent decades due to their wide range of applications to particle and atom trapping. Lately, the focus of particle trapping has shifted from the microscale to the nanoscale. This few orders of magnitude change is driven, in part, by the needs of life scientists who wish to better manipulate smaller biological samples. Devices with subwavelength features are excellent platforms for shaping local electric fields for this purpose. A major factor that inhibits the manipulation of submicrometer particles is the diffraction‐limited spot size of free‐space laser beams. As a result, technologies that can circumvent this limit are highly desirable. This review covers some of the more significant advances in the field, from the earliest attempts at trapping using focused Gaussian beams, to more sophisticated hybrid plasmonic/metamaterial structures. In particular, examples of emerging optical trapping configurations are presented.

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“…Scheibe and Jelley independently investigated PIC in a poor solvent such as aqueous solution [21,22,[63][64][65]. Scheibe and Jelley independently investigated PIC in a poor solvent such as aqueous solution [21,22,[63][64][65].…”

Section: Molecular J and H Aggregates: Cyanine Dyes And Carotenesmentioning

confidence: 99%

Charges and Excited States in Organic Semiconductors

Köhler

Bäßler

2015

Electronic Processes in Organic Semiconductors

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In Chapter 1, we discussed how light interacts with a molecule and thereby creates an excited state. The part of the molecule that absorbs light is termed a chromophore. A chromophore may comprise (i) the π-conjugated core of a molecule without any non-conjugated side chains, or (ii) an electronically coherent part in a π-conjugated polymer chain. In this chapter, we explore how the nature of the excited state in a chromophore is affected by the chromophore's environment and the way in which the chromophores are arranged with respect to each other. The species formed upon excitation of a neutral chromophore is commonly referred to as neutral excitation. The term charged excitation is associated with the chromophore in a charged state and shall be discussed in Section 2.4. Excited Molecules from the Gas Phase to the Amorphous FilmA good starting point to understand excited states in organic semiconductors is to follow the changes that are associated with having a single excited molecule in different environments. In order to correctly interpret spectra it is essential to know how and why the absorption and luminescence spectra of molecules change when going from the bare molecule, present in the gas phase, to the molecule embedded in an environment, as given in the condensed phase. The starting point is therefore given by the gas phase spectra. Absorption and fluorescence (FL) spectra of aromatic molecules used in optoelectronic devices are not routinely measured in the gas phase. We shall consider the tetracene molecule as a model object because this molecule has been investigated in the gas phase, in solid and liquid solution, in an amorphous as well as in a crystalline phase. Moreover, in bulk films and in the crystal, singlet excitations of tetracene and its derivatives can undergo fission into pair of triplets states, which will turn out to be an important process in organic solar cells (OSCs) [1-3]. Effects due to PolarizationFirst, let us consider how the absorption and FL spectra of the bare, isolated molecule evolve when it becomes surrounded by inert noble gas atoms. The prototypical experiment to study this involves the use of supersonic expansion beams [4]. Pioneering work has been carried out in the 1980s by the Jortner group in Tel Aviv [5]. The basic setup of the experiment is shown in Figure 2.1a. Two adjacent chambers are connected by a small outlet, for instance, an outlet of 150 μm diameter. One chamber is filled with an inert gas such as argon and kept at a certain stagnation pressure, while the second chamber is kept under a dynamic vacuum. As the argon escapes through the outlet from the full into the empty chamber, it forms a supersonic expanding beam. Typically, one investigates not pure argon but rather a mixture formed by the carrier gas argon and the vapor of the molecule of interest. The Jortner group conducted the experiment by placing tetracene into the argon-filled sample chamber and heating it to 220 ∘ C where tetracene has a vapor pressure of about 0.1 mbar. They

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Polymerisation und polymere Adsorption als Ursache neuartiger Absorptionsbanden von organischen Farbstoffen

Cited by 137 publications

References 4 publications

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

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

Optical trapping and manipulation of micrometer and submicrometer particles

Charges and Excited States in Organic Semiconductors

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