Anti-Smoluchowski time dependence of the delayed fluorescence from anthracene in viscous solution due to triplet-triplet annihilation

Nickel, Bernhard; H, Wilhelm; Ruth, Albert A.

doi:10.1016/0301-0104(94)00240-1

Cited by 18 publications

(15 citation statements)

References 32 publications

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“…It was really measured and given a reasonable explanation [146] that was confirmed and extended in Ref. [145] The biexcitonic reactions can also be responsible for bimolecular ionization in liquids and solids, which results in nonlinear photoconductivity of the systems.…”

Section: Discussionmentioning

confidence: 77%

Unified Theory of Photochemical Charge Separation

Burshteǐn

2000

Advances in Chemical Physics

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Section: Discussionmentioning

confidence: 77%

Unified Theory of Photochemical Charge Separation

Burshteǐn

2000

Advances in Chemical Physics

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“…The intrinsic triplet decay rate constant of perylene is also reduced in viscous solvents ( Figure 5 b) due to a restriction of molecular vibrations. 70 These effects will benefit the TTA-UC efficiency, explaining the observed high TTA-UC quantum yields in viscous solvents.…”

Section: Resultsmentioning

confidence: 99%

Annihilation Versus Excimer Formation by the Triplet Pair in Triplet–Triplet Annihilation Photon Upconversion

Gray

Mårtensson

et al. 2019

J. Am. Chem. Soc.

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The triplet pair is the key functional unit in triplet–triplet annihilation photon upconversion. The same molecular properties that stabilize the triplet pair also allow dimers to form on the singlet energy surface, creating an unwanted energy relaxation pathway. Here we show that excimer formation most likely is a consequence of a triplet dimer formed before the annihilation event. Polarity-dependent studies were performed to elucidate how to promote wanted emission pathways over excimer formation. Furthermore, we show that the yield of triplet–triplet annihilation is increased in higher-viscosity solvents. The results will bring new insights in how to increase the upconversion efficiency and how to avoid energy-loss channels.

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“…If the delayed fluorescence in the time range governed by anti-Smoluchowski behaviour is considered, 4 the modified boundary condition r A (r,0) in eqn. ( 7) must be applied and the factor f in eqn.…”

Section: Spatially Periodic Excitationmentioning

confidence: 99%

Application of Smoluchowski's generalized theory to the kinetics of triplet–triplet annihilation of anthracene in viscous solution after long-pulse excitation

Nickel

Borowicz

Ruth

et al. 2004

Phys. Chem. Chem. Phys.

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The validity of Smoluchowski's theory is demonstrated by its application to the bimolecular triplet-triplet annihilation (TTA) T 1 þ T 1 ! S 0 þ S 1 in viscous solution. For that purpose the delayed S 1 ! S 0 fluorescence of anthracene in cis-1,3-dimethylcyclohexane/trans-1,4-dimethylcyclohexane (1:1) was measured after UV excitation with long laser pulses ($30 ms) in a temperature range where TTA is completely diffusion controlled. Through the adequate treatment of the kinetics of TTA upon spatially homogeneous and spatially periodic excitation (which is partially based on the results of previous publications) absolute values for the diffusion coefficients D of triplet molecules, for the effective annihilation distance R A and for the Fö rster radius R ST of heterogeneous annihilation S 1 þ T 1 ! S 0 þ T n were determined. The temperature dependence of all three parameters (D, R A and R ST ) is discussed. From the decrease of R A with increasing temperature, the parameters A and L can be determined, which define the exponential distance dependence of the annihilation of a triplet pair in the kinetic model of Butler and Pilling (1977). Differences of the two models and applicability criteria are discussed.

show abstract

Anti-Smoluchowski time dependence of the delayed fluorescence from anthracene in viscous solution due to triplet-triplet annihilation

Cited by 18 publications

References 32 publications

Unified Theory of Photochemical Charge Separation

Unified Theory of Photochemical Charge Separation

Annihilation Versus Excimer Formation by the Triplet Pair in Triplet–Triplet Annihilation Photon Upconversion

Application of Smoluchowski's generalized theory to the kinetics of triplet–triplet annihilation of anthracene in viscous solution after long-pulse excitation

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