Magnetic effects on delayed fluorescence in naphthalene crystals at low and high triplet exciton densities

Altwegg, L.; Chabr, M.; Zschokke‐Gränacher, I.

doi:10.1103/physrevb.14.1963

Cited by 27 publications

(3 citation statements)

References 12 publications

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“…To avoid the oversimplifications and pitfalls involved in one-dimensional cases as well as the complexities of three-dimensional ones we study the quasi-two-dimensional system of naphthalene. The latter is anisotropic enough to give essentially two-dimensional exciton migration for both the first triplet and the first singlet excitations [4][5][6][7][8][9]. We compare our experimental results to a theoretical exciton cluster model, based on variable range connectivity and percolation [10].…”

mentioning

confidence: 99%

Variable range cluster model of exciton migration: Dimensionality and critical exponents for naphthalene

Kopelman

Monberg

Newhouse

et al. 1979

Journal of Luminescence

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mentioning

confidence: 99%

Variable range cluster model of exciton migration: Dimensionality and critical exponents for naphthalene

Kopelman

Monberg

Newhouse

et al. 1979

Journal of Luminescence

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“…On the other hand, the value of As obtained from the low-field effect is 2.0 x 1Olo s-l and from the high-field effect 2.0 x loll 8-l by Altwegg et al [15]. Using (a), As may be calculated by assuming kl = 2y'.…”

Section: Reactioii Tate Constant In the Diffusion Limitmentioning

confidence: 96%

Reaction Rate Constants of Triplet Excitons in Naphthalene Single Crystals

Asami

Νακαyama

Chong

et al. 1978

Physica Status Solidi (b)

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The temperature dependence of the decay of the delayed fluorescence in a naphthalene crystal doped with P-chloronaphthalene is measured. The results are analyzed in terms of the reaction kinetics comprising a term for the collision of a free exciton with an exciton trapped by P-chloronaphthalene (X-trap). The reaction rate constant between the free and trapped excitons is obtained and found to be larger than the reaction rate constants of the triplet exciton with another triplet exciton, a radical, and a guest anthracene molecule in naphthalene crystals. Assuming that the reaction rate constant between the free and trapped excitons is the value at the diffusion limit, the transition probabilities from the neighbouring pair of an exciton and an energy acceptor to the excited state of the energy acceptor are obtained and compared with the results of the analysis using Dexter's theory.Die Temperaturabhiingigkeit des Abklingens der verzogerten Fluoreszenz eines Naphtalinkristalls, der mit P-Chlonutphtalen dotiert wurde, wird gemessen. Die Ergebnisse werden mit Reaktionskinetik analysiert unter EinschluB eines Termes fur den StoB eines freien Exzitons rnit einem durch P-Chlornaphtalen getrapten Exziton (X-Trap). Die Reaktionsrate zwischen den freien und getrapten Exzitonen wirderhalten, und es wirdgefunden, daB sie groler ale dieReaktionsrate eines Triplett-Exzitons mit einem anderen Triplett-Exziton, einem Radikal und einem GastAnthrazenmolekiil in Naphtalinkristallen ist. Unter der Annahme, daB die Reaktionsrate zwischen den freien und getrapten Exzitonen der Wert an der Diffusionsgrenze ist, werden die Ubergangswahrscheinlichkeiten von den Nachbarpaaren eines Exzitons und einem Energieakzeptor zu den ageregten Zustiiinden des Energieakzeptors erhalten und mit Egebnissen einer Analyse mittels der Theorie von Dexter verglichen.

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“…[32,33] and the recent large volume.of ESR work (see, for example, ref. [34]). The utilization of "resonance pair" ("mini-exciton") systems for the study of molecular-crystal excitations has started at about the same time both for electronic excitons [35-381, and vibrational excitons [39,40].…”

Section: Introductionmentioning

confidence: 99%

Vibrational exciton cluster states, percolation and pairwise interactions: Benzene A2u band

LeSar

Kopelman

1978

Chemical Physics

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Infrared spectra of isotopic mixed benzene crystals (C e 6 H /C D) 6 6 were obtained at about boiling nitrogen temperature, with emphasis on the umbrella mode (at about 700 cm-'). These are interpreted in terms of guest cluster spectra (monomers, pairs, etc.) up to about 55% mole. Static percolation sets in at about 50%. resulting in an extended exciton band. The line positions, line intensities and the percolation concentration all aBee quantitatively with an effective Z-dimensionaf sqtuzre lartice exciton inferactiozz topokz~~. This means that very short range, nearest neighbor interchange equivalent, excitation exchange interactions dominate over the long range transition-dipole type terms even in this most intense, dipole allowed IR band. These results fully support our recent picture of the umbrella mode exciton baitd, in both solid and liquid benzene. Similarities between these solid and liquid exciton bands are pointed out. The existence of pseudolocalized states, in the middle of the energy band of the extended states, is illustrated.

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Magnetic effects on delayed fluorescence in naphthalene crystals at low and high triplet exciton densities

Cited by 27 publications

References 12 publications

Variable range cluster model of exciton migration: Dimensionality and critical exponents for naphthalene

Variable range cluster model of exciton migration: Dimensionality and critical exponents for naphthalene

Reaction Rate Constants of Triplet Excitons in Naphthalene Single Crystals

Vibrational exciton cluster states, percolation and pairwise interactions: Benzene A2u band

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