A Model Oligomer Approach to Light-Emitting Semiconducting Polymers

Hutten, Paul F. van; Krasnikov, V. V.; Hadziioannou, Georges

doi:10.1021/ar980032f

Cited by 102 publications

(96 citation statements)

References 35 publications

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“…A first example is the observation by Weder et al, [13] following earlier results by Hadziioannou et al, [14] of a strong tendency toward excimer formation in crystalline solid cyano-substituted oligo(p-phenylene vinylene) derivatives. This tendency is facilitated by pronounced p-p interactions of planarized molecules stacked in a cofacial arrangement.…”

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confidence: 71%

Excimers Beyond Pyrene: A Far‐Red Optical Proximity Reporter and its Application to the Label‐Free Detection of DNA

et al. 2015

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A family of organic chromophores that, like pyrene, forms emissive excimers is reported. Their chemical and photophysical properties are superior to pyrene for the design of chemo- and biosensors. Unlike hydrophobic pyrene, which requires excitation by cell-damaging UV irradiation, these polar dyes absorb strongly in the visible range, and their excimers emit brightly in the red to far-red region of the electromagnetic spectrum. The intensity of the emission signal is greatly increased upon formation of a preassociated dimer that is triggered upon aggregation or crystallization. In demonstration of the potential of this new family of excimer-forming dyes, a probe that is capable of detecting label-free DNA in water down to 10 pM and also doubles as a visualization agent for DNA in gel electrophoresis is reported.

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confidence: 71%

Excimers Beyond Pyrene: A Far‐Red Optical Proximity Reporter and its Application to the Label‐Free Detection of DNA

et al. 2015

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“…To better understand the molecular level interactions in these polymers, for example the extent of electronic wave function delocalization, model oligomer systems have been studied as well. 3,4 Advantages of studying the oligomers include the ability to obtain high purity, single component samples and the ability to study the unaggregated molecule in dilute solution. Oelkrug and co-workers have looked at the properties of PV oligomers, both isolated and aggregated, in hopes of better understanding how the intermolecular interactions affect the properties of neat polymer films.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Individual Submicron Distyrylbenzene Aggregates Using Temperature-Dependent Picosecond Fluorescence and Atomic Force Microscopy

2004

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The time-resolved fluorescence of individual distyrylbenzene aggregates is studied in order to determine the effects of aggregate morphology on the emission properties. Using a confocal microscope and a photoncounting streak camera, we measure the full time and wavelength dependence of the fluorescence from individual submicron aggregates at the temperatures 290, 100, and 4 K. The morphology of these aggregates is characterized separately using tapping-mode atomic force microscopy. All aggregates show temperaturedependent fluorescence decays and spectral shifting, most likely due to activated energy transfer to lower energy sites which correspond to spectrally distinct species. We find significant aggregate-to-aggregate variations in the fluorescence spectra and decays, but the amount of variation depends on preparation conditions: solvent-annealed aggregates have a more uniform appearance and less variation in their spectral properties. To analyze the data, we model the dynamics in terms of two coupled states, which correspond to the intrinsic exciton in solid DSB and a lower energy defect. Even this simple model requires additional assumptions, but it allows us to extract spectra corresponding to both species, and generate histograms of the two different decay rates. Variations in the decay rates are ascribed to variations in the concentration of quenching defects between individual aggregates.

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“…The introduction of alkoxy groups also offers the possibility to tune the absorption and emission wavelength and improve the electroluminescence yield of LED's. [8][9][10] The application of PPV's in LED's and photovoltaic cells relies critically on the ability of the polymer to transport charges. A detailed knowledge of the nature of charge carriers in PPV's is therefore essential.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental studies of the opto-electronic properties of positively charged oligo(phenylene vinylene)s: Effects of chain length and alkoxy substitution

Grozema¹,

Candeias

Swart³

et al. 2002

The Journal of Chemical Physics

106

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In this paper a combined experimental and quantum chemical study of the geometry and opto-electronic properties of unsubstituted and dialkoxy-sustituted phenylene-vinylene oligomers ͑PV's͒ is presented. The optical absorption spectra for PV cations with different chain lengths and substitution patterns were measured using pulse radiolysis with time-resolved spectrophotometric detection from 1380 to 500 nm ͑0.9 to 2.5 eV͒. The geometries of the PV's studied were optimized using density functional theory ͑DFT͒ for both the neutral and singly charged molecule. The spectra for the PV radical cations were then calculated using singly excited configuration interaction with an intermediate neglect of differential overlap reference wave function method together with the DFT geometry. The agreement between experimental and theoretical absorption energies is excellent; most of the calculated radical cation absorption energies are within 0.15 eV of the experimental values. The pattern of dialkoxy-substitution is found to have a large effect on the optical absorption spectrum of the cation. Using the calculated charge distribution it is shown that the degree of delocalization of the charge correlates with the energy of the lowest absorption band. If alkoxy side chains are present on some of the rings the positive charge tends to localize at those sites.

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A Model Oligomer Approach to Light-Emitting Semiconducting Polymers

Cited by 102 publications

References 35 publications

Excimers Beyond Pyrene: A Far‐Red Optical Proximity Reporter and its Application to the Label‐Free Detection of DNA

Excimers Beyond Pyrene: A Far‐Red Optical Proximity Reporter and its Application to the Label‐Free Detection of DNA

Characterization of Individual Submicron Distyrylbenzene Aggregates Using Temperature-Dependent Picosecond Fluorescence and Atomic Force Microscopy

Theoretical and experimental studies of the opto-electronic properties of positively charged oligo(phenylene vinylene)s: Effects of chain length and alkoxy substitution

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