Fluorescence quenching by reversible excimer formation: Kinetics and yield predictions for a classical potential association–dissociation model

Naumann, W.

doi:10.1063/1.1718156

Cited by 7 publications

(3 citation statements)

References 28 publications

(18 reference statements)

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“…The set of these equations with their kernel () are identical to IET equations derived in ref (eqs with kernels ) and their analogues postulated in ref . They are also in agreement with some particular results obtained earlier. − …”

Section: Competition Of Photoionization and Exciplex Formationsupporting

confidence: 88%

Exciplex Formation Accompanied with Excitation Quenching

Fedorenko

Burshteǐn

2010

J. Phys. Chem. A

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The competence of the reversible exciplex formation and parallel quenching of excitation (by electron or energy transfer) was considered using a non-Markovian pi-forms approach, identical to integral encounter theory (IET). General equations accounting for the reversible quenching and exciplex formation are derived in the contact approximation. Their general solution was obtained and adopted to the most common case when the ground state particles are in great excess. Particular cases of only photoionization or just exciplex formation separately studied earlier by means of IET are reproduced. In the case of the irreversible excitation quenching, the theory allows specifying the yields of the fluorescence and exciplex luminescence, as well as the long time kinetics of excitation and exciplex decays, in the absence of quenching. The theory distinguishes between the alternative regimes of (a) fast equilibration between excitations and exciplexes followed by their decay with a common average rate and (b) the fastest and deep excitation decay followed by the weaker and slower delayed fluorescence, backed by exciplex dissociation.

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Section: Competition Of Photoionization and Exciplex Formationsupporting

confidence: 88%

Exciplex Formation Accompanied with Excitation Quenching

Fedorenko

Burshteǐn

2010

J. Phys. Chem. A

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“…However this configuration results freezed within the polymer matrix and this could account for the enhancement, as opposed to the quenching effect in pyridine solution. The lower PLQY values measured for the more concentrated 30 and 50 wt% polymers can be ascribed to a concentration quenching effect where the number of neighboring fluorophores is too high and results in rapid nonradiative decays of the excimers . Where these effects are negligible (PR′ i ‐10), the polymers provide the highest PLQY values, regardless the type of ligand (A or B).…”

Section: Resultsmentioning

confidence: 97%

High Solid State Photoluminescence Quantum Yields and Effective Color Tuning in Polyvinylpyridine Based Zinc(II) Metallopolymers

Borbone

Caruso

Palma

et al. 2015

Macro Chemistry & Physics

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Two series of amorphous metallopolymers are produced by grafting N′-substituted aroylhydrazide zinc(II) coordinated fragments onto poly-(4-vinylpyridine) at several concentrations. The polymers are characterized concerning their thermal behavior and absorption/emission properties. In the solid state their photoluminescence (PL) performances are remarkable. The emission color can be effectively tuned across the entire visible spectrum by varying the strength of the electron acceptor substituent on the tridentate ligand. As concerns the emission intensity, PL quantum yields measured on spin coated thin fi lms range from medium to high values and greatly exceed those of the model molecular complexes. Some of these values can be considered among the highest reported in the literature for metallopolymers. through chemical synthesis. [1][2][3][4][5][6][7][8] Among these materials polymers containing transition metal complexes (metallopolymers) are an important class whose electron rich ligands and metal centers can enhance optical and electronic properties. [9][10][11][12][13] In the last years our research group focused interest [14][15][16] on O,N ligands with functional substituents able to coordinate a d 10 transition metal ion like Zn(II) into stable chelate complexes with interesting photoluminescence performances. [ 17 ] In a recent study [ 15,16 ] N′-substituted aroylhydrazide fragments acted as O,N,O tridentate ligands in mono and dinuclear Zn(II) complexes with high photoluminescence quantum yield (PLQY) in the solid state. The ability of pyridine molecules to complete the coordination sphere of the complexes in penta or hexacoordinated arrangements was explored and its dominant contribution to the lowest unoccupied molecular orbital (LUMO) involved in the electronic transitions was pointed up. The present work has the purpose

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“…This can be compared to a value for the corresponding monomeric reference compound of Φ F = 0.67 ± 0.04, where only monomer fluorescence is observed. Time-resolved fluorescence spectroscopy showed that the decay profiles recorded for monomer emission required analysis as the sum of three exponential components (Figure ) . Thus, the fluorescence intensity ( I F ) at time t could be well explained in terms of eq 1, where τ refers to a particular decay time and A is its fractional contribution to the total fluorescence signal at that wavelength.…”

Section: Resultsmentioning

confidence: 99%

Intramolecular Delayed Fluorescence as a Tool for Imaging Science: Synthesis and Photophysical Properties of a First-Generation Emitter

et al. 2007

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The synthesis of a molecular dyad comprising two pyrene-based terminals covalently linked via a Hantzsch 1,4-dihydropyridine is described. The dyad is sufficiently flexible to allow the end groups to approach each other in fluid solution, as is evident from the appearance of excimer fluorescence. Transient absorption spectroscopy indicates that both intra-and intermolecular triplet-triplet annihilation (TTA) takes place at modest laser intensities and leads to delayed fluorescence. The spectral distribution of the delayed fluorescence signal matches that of the excimer. The kinetics of TTA and the overall yield of delayed fluorescence are considered in terms of the molecule adopting disparate conformations that interconvert slowly. Consideration is also given to the possible application of such delayed fluorescence in imaging technology.

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Fluorescence quenching by reversible excimer formation: Kinetics and yield predictions for a classical potential association–dissociation model

Cited by 7 publications

References 28 publications

Exciplex Formation Accompanied with Excitation Quenching

Exciplex Formation Accompanied with Excitation Quenching

High Solid State Photoluminescence Quantum Yields and Effective Color Tuning in Polyvinylpyridine Based Zinc(II) Metallopolymers

Intramolecular Delayed Fluorescence as a Tool for Imaging Science: Synthesis and Photophysical Properties of a First-Generation Emitter

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