The spectroscopic investigation of the fluorescence decay time of the anthracene crystal

Galanin, M. D.; Khan-Magometova, Sh.D.; Chizhikova, Z. A.; Demchuk, M. I.; Chernyavskii, A. F.

doi:10.1016/0022-2313(75)90059-9

Cited by 17 publications

(4 citation statements)

References 8 publications

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“…The increasing characteristic lifetime of the excitons with increasing wavelength has been observed earlier by Galanin and Khan‐Magometova, and interpreted theoretically by Berberan‐Santos et al . This correlation would be coherent with an underlying reabsorption mechanism, an effect that only becomes negligible for smaller, sub‐micrometer‐scaled crystals . However, in the work of Vu et al .…”

Section: Resultssupporting

confidence: 56%

Fluorescence Spectroscopy of AdamBODIPY Single Crystals

et al. 2017

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Interest in the fluorescence of organic solids is increasing with the development of nanosensors and research into new molecules with aggregation‐induced fluorescence properties. We have gone beyond the qualitative observation of fluorescence by analyzing the luminescence properties of planar single crystals of a 4,4′‐difluoro‐4‐bora‐(3a,4a)‐diaza‐s‐indacene (BODIPY) derivative with micrometric dimensions. A simple Frenkel exciton model applied to this crystal predicts one band. From time‐resolved fluorescence spectra, three emissions were distinguished. The shortest‐lived one at λ=547 nm was predicted by theory and corresponds to an exciton lifetime of 0.9 ns. A trap with an intermediate emission lifetime of 1.2 ns was found at 569 nm and a final trap at 620 nm has a lifetime of 1.9 ns. These attributions were confirmed by the study of the polarization of these emissions. The 547 nm emission was polarized along the long axis of the crystal as predicted by the Frenkel exciton model. The 569 nm emission was polarized perpendicularly to the plane of the crystal and the 620 nm emission was polarized along the short axis. Thus, the two red‐shifted bands were related to well‐defined defects with specific orientations in the crystal. Fluorescence lifetime imaging measurements showed that the density of these defects is not uniform and that under our synthesis conditions, they are formed in the initial steps of the growth and therefore appear in the center of the crystals.

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Section: Resultssupporting

confidence: 56%

Fluorescence Spectroscopy of AdamBODIPY Single Crystals

et al. 2017

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“…A non-single-exponential decay of fluorescence from chemically pure anthracene crystal is generally associated with the presence of structural defects, e.g., refs ,, and . These defects can act as trapping centers for migrating singlet excitons.…”

Section: Resultsmentioning

confidence: 99%

High-Pressure Effects on the Electronic Structure of Anthracene Single Crystals: Role of Nonhydrostaticity

et al. 2009

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Optical spectroscopy methods were used to examine the effect of nonhydrostaticity on the electronic structure of anthracene single crystals compressed statically to 9 GPa. Two pressure-transmitting media, nitrogen (hydrostatic) and water (nonhydrostatic above approximately 5.5 GPa), were utilized. It was found that nonhydrostatic compression generates several new features both in the absorption and fluorescence spectra: (i) formation of new absorption and fluorescence bands, (ii) deviations in pressure shift of fluorescence peaks, (iii) extensive broadening of vibrational peaks, and (iv) irreversible changes in the spectra shape upon pressure unloading. Furthermore, the time-resolved fluorescence decay curves measured at the wavelength corresponding to the new fluorescence band show clear initial increase. These new features are accompanied by inhomogeneous color changes and macroscopic lines on the (001) plane of the crystal. All of the changes are discussed and correlated with microscopic transformations in the crystal. It is demonstrated that nonhydrostatic compression in anthracene crystal introduces inelastic changes in the form of dislocations along [110] and [110] directions. These dislocations lead to the development of dimeric structures and, consequently, to various changes in the electronic response of the compressed anthracene crystal.

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“…Knowledge about the photophysical and diffusion properties of excitons populated in various kinds of materials is important in designing the optoelectronic devices with improved performance. Although exciton dynamics in the crystalline phase and in thin films of anthracene have been extensively studied by several groups, − to the best of our knowledge, these properties have not been discussed in nanoaggregates. Preparation of anthracene nanoaggregate by reprecipitation technique has been reported recently, and these particles have been shown to be quite stable in ambient conditions. ,,− Herein, we have investigated the basic photophysical properties and exciton dynamics in anthracene nanoaggregates using steady state and time-resolved absorption and fluorescence spectroscopic techniques.…”

Section: Introductionmentioning

confidence: 99%