Structure Property Relationships in Conjugated Organic Systems

O’Neill, Luke A.J.; Lynch, Patrick; McNamara, Mary; Byrne, Hugh J.

doi:10.1016/j.synthmet.2005.07.149

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Similar behavior has been observed in a series of acene and phenyl oligomers and was attributed in these systems to a correlation between electron-vibrational coupling and oligomer length. 36 PLQYs and PL decays were measured in the oligofluorene solutions to gain further insights into the photophysical properties of the materials. The PL decays in such solutions are monoexponential (data not shown) and the PL lifetimes were determined by fitting the data with a single exponential decay function.…”

Section: Absorption and Photoluminescence Properties In Solutionmentioning

confidence: 99%

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Choi

Mazur

Mager

et al. 2014

Phys. Chem. Chem. Phys.

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We investigate the photophysical and amplified spontaneous emission properties of a series of monodisperse solution-processable oligofluorenes functionalized with hexyl chains at the C9 position of each fluorene unit. Thin films of these oligofluorenes are then used in organic field-effect transistors and their charge transport properties are examined. We have particularly focused our attention on the influence of oligofluorene length on the absorption and steady-state fluorescence spectra, on the HOMO/LUMO energy levels, on the photoluminescence lifetime and quantum yield as well as on the amplified spontaneous emission properties and the charge carrier mobilities. Differential scanning calorimetry and X-ray diffraction measurements demonstrate that, among all oligofluorene derivatives used in this study, only the structure and morphology of the pentafluorene film is significantly modified by a thermal treatment above the glass transition temperature, resulting in a 9 nm blue-shift of the fluorescence spectrum without significant changes in the photoluminescence quantum yield and in the amplified spontaneous emission threshold. In parallel, hole field-effect mobility is significantly increased from 8.6 × 10(-7) to 3.8 × 10(-5) cm(2) V(-1) s(-1) upon thermal treatment, due to an increase of crystallinity. This study provides useful insights into the morphological control of oligofluorene thin films and how it affects their photophysical and charge transport properties. Moreover, we provide evidence that, because of the low threshold, the tunability of the amplified spontaneous emission and the photostability of the films, these oligofluorenes are promising candidates for organic solid-state laser applications.

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Section: Absorption and Photoluminescence Properties In Solutionmentioning

confidence: 99%

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Choi

Mazur

Mager

et al. 2014

Phys. Chem. Chem. Phys.

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show abstract

“…Second, the absorption and, maybe to a lesser extent, the emission from organic fluorophors can be approximated by treating the π electrons in a double bond or in a series of conjugated double bonds using a particle-in-abox model (Kuhn, 1949;O'Neill et al, 2005);. The length of this box is approximately that of the spacing between the atoms in the bond, or in the case of conjugated double bonds, the relevant length is the overall distance the electron might move through the set of conjugated double bonds.…”

Section: Biomolecules Exhibiting Uv-excited Fluorescence Have Conjugamentioning

confidence: 99%

“…More complex expressions based on box models (O'Neill, 2005) are available, but the simplest may be best for illustrating the concepts.…”

Section: Biomolecules Exhibiting Uv-excited Fluorescence Have Conjugamentioning

confidence: 99%

Optics of Biological Particles

Hoekstra¹,

Maltsev²,

Videen³

2007

NATO Science Series

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Determination of xanthophylls in egg yolk using a combination of spectrophotometric and diol phase high‐performance liquid chromatography methods

Nguyen,

Deineka,

Burzhinskaya

et al. 2024

J of Separation Science

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Normal‐phase (NP) liquid chromatography is one of the most effective methods for separating isomers with sensitive structural features, including xanthophyll isomers. In this work, reverse‐phase (RP) and NP liquid chromatography (LC), with silica gel and diol phase, respectively, were evaluated for the separation of xanthophyll isomers. The results showed that RP LC with monomeric C18 phase not only poorly separate all xanthophyll isomers in egg yolk but also requires additional sample preparation to eliminate triacylglycerols in egg yolk. The diol phase of NP‐LC provided the highest efficiency for separating lutein, zeaxanthin, and their cis‐isomers with isocratic separation using mobile phases consisting of n‐hexane and polar modifiers (such as acetone, methyl tert‐butyl ether, or ethyl acetate). To determine the xanthophyll content, peak areas from LC and total absorbance from spectrophotometry measurements were used. The approach was applied to analyze the xanthophylls of nine commercial egg samples. The results revealed that five out of nine analyzed samples contained a high level of canthaxanthin, which contributes to color enhancement but not to prevent age‐related macular degeneration. Together, it shows that NP LC with diol phase combined with spectrophotometry is a powerful tool to monitor xanthophylls in eggs.

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Structure Property Relationships in Conjugated Organic Systems

Cited by 6 publications

References 7 publications

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Optics of Biological Particles

Determination of xanthophylls in egg yolk using a combination of spectrophotometric and diol phase high‐performance liquid chromatography methods

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