Edge dislocations — emission centres in deformed anthracene single crystals

Lisovenko, V. A.; Shpak, M. T.; Antoniuk, V.G.

doi:10.1016/0009-2614(76)80378-8

Cited by 30 publications

(8 citation statements)

References 12 publications

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“…The defects in the crystals play a very important role in the luminescence property [12]. The results obtained with selective self-seeded crystals are better when compared to previous reports [13 -15].…”

Section: Discussionsupporting

confidence: 36%

Effect of low angle grain boundaries on detection characteristics of trans-stilbene crystals

et al. 2004

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Section: Discussionsupporting

confidence: 36%

Effect of low angle grain boundaries on detection characteristics of trans-stilbene crystals

et al. 2004

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“…Here we focus on one-dimensional aggregates broadly representative of edge dislocations ͑"line" defects͒. 76 For one-dimensional ͑1D͒ defects we consider a linear array of unit cells along b, which is a simplified model for the common ͑001͒ ͓100͔ edge dislocation which is shown in Fig. 1͑c͒.…”

Section: -6mentioning

confidence: 99%

Experimental and theoretical study of temperature dependent exciton delocalization and relaxation in anthracene thin films

Ahn

Müller

Al‐Kaysi

et al. 2008

The Journal of Chemical Physics

101

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The spectroscopy of solid anthracene is examined both experimentally and theoretically. To avoid experimental complications such as self-absorption and polariton effects, ultrathin polycrystalline films deposited on transparent substrates are studied. To separate the contributions from different emitting species, the emission is resolved in both time and wavelength. The spectroscopic data are interpreted in terms of a three-state kinetic model, where two excited states, a high energy state 1 and a low energy state 2, both contribute to the luminescence and are kinetically coupled. Using this model, we analyze the spectral lineshape, relative quantum yield, and relaxation rates as a function of temperature. For state 1, we find that the ratio of the 0-0 vibronic peak to the 0-1 peak is enhanced by roughly a factor of 3.5 at low temperature, while the quantum yield and decay rates also increase by a similar factor. These observations are explained using a theoretical model previously developed for herringbone polyacene crystals. The early-time emission lineshape is consistent with that expected for a linear aggregate corresponding to an edge-dislocation defect. The results of experiment and theory are quantitatively compared at different temperatures in order to estimate that the singlet exciton in our polycrystalline films is delocalized over about ten molecules. Within these domains, the exciton's coherence length steadily increases as the temperature drops, until it reaches the limits of the domain, whereupon it saturates and remains constant as the temperature is lowered further. While the theoretical modeling correctly reproduces the temperature dependence of the fluorescence spectral lineshape, the decay of the singlet exciton appears to be determined by a trapping process that becomes more rapid as the temperature is lowered. This more rapid decay is consistent with accelerated trapping due to increased delocalization of the exciton at lower temperatures. These observations suggest that exciton coherence can play an important role in both radiative and nonradiative decay channels in these materials. Our results show that the spectroscopy of polyacene solids can be analyzed in a self-consistent fashion to obtain information about electronic delocalization and domain sizes.

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“…The luminescence spectra of the AN nanowires during synthesis display differences from those of AN bulk crystasl (Figure A) which demonstrates the characteristics of AN monomer emission bands at 420 and 445 nm (attributed to the 0−0 band by D 1 and D 2 bands, respectively) and the excimer bands at 486 and 530 nm (attributed to the AN formed by two AN molecules overlapped each other with one benzene ring , ). The (100) direction of the anthracene crystal is known to be responsible for the D 2 band in the luminescence spectrum, whereas those in the (001) direction are responsible for the D 1 band . However, the emission spectrum of AN nanowires show a sharp luminescence centered at 443 nm due to growth of orientation along the a axis.…”

mentioning

confidence: 99%

Synthesis of Organic One-Dimensional Nanomaterials by Solid-Phase Reaction

et al. 2003

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The synthesis of anthracene (AN) nanowires and perylene (PY) nanorods on the basis of solid-phase organic reactions under controlled conditions is discussed, and the structures are confirmed by SEM, TEM, and XRD. The dimension-dependent emission properties of the AN nanowires and PY nanorods is observed. This approach is expected to form a new general route for the controlled morphosynthesis of organic molecular materials in restricted dimensions, with controlled size and shape, the solid-state physical properties of which are of great interest. It should have outstanding potential in providing customized 1D nanomaterials for a broad range of applications for molecule devices and nanoscience and is expected to be applicable other functionalized nanomaterials (i.e., organic, inorganic, and polymer).

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Edge dislocations — emission centres in deformed anthracene single crystals

Cited by 30 publications

References 12 publications

Effect of low angle grain boundaries on detection characteristics of trans-stilbene crystals

Effect of low angle grain boundaries on detection characteristics of trans-stilbene crystals

Experimental and theoretical study of temperature dependent exciton delocalization and relaxation in anthracene thin films

Synthesis of Organic One-Dimensional Nanomaterials by Solid-Phase Reaction

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