ChemInform Abstract: SINGLET EXCITON FISSION IN PURE AND DOPED ANTHRACENE

Burg, Kathrin Von; Zschokke-Graenacher, I.

doi:10.1002/chin.197937049

Cited by 2 publications

(9 citation statements)

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“…For 1 , the threshold energy for the initial rise of Δ F / F is 3.66 eV, and for 2 , it is 2.48 eV, values close to twice the respective triplet excitation energies . This interpretation has gained general acceptance. ,, …”

Section: Molecular Crystalsmentioning

confidence: 81%

“…In single crystals of 1 excited at 4.89 eV, the triplet quantum yield due to singlet fission was 6%, a value compatible with fast vibrational relaxation . Fitting the dependence of prompt fluorescence intensity on magnetic field angle to the Johnson−Merrifield model yielded k −1 = 3 × 10 9 s −1 for the dissociation of the correlated triplet pair.…”

Section: Molecular Crystalsmentioning

confidence: 87%

“…Excited near its absorption edge, crystalline 1 has a fluorescence quantum yield of 0.95, and singlet fission is not competitive at practical temperatures. However, it is possible to overcome the energy barrier by optical excitation at higher energies. ,,,,− The nature of the high-energy fissionable state from which singlet fission in 1 occurs has received much attention and depends on both excitation energy and intensity, as described below.…”

Section: Molecular Crystalsmentioning

confidence: 99%

“…Later studies focused on the observation of magnetic field effects on prompt and delayed fluorescence of 1 as evidence of singlet fission (section ). ,,,,− Under magnetic resonance conditions, the prompt fluorescence gains intensity as excitation energy increases. , Fine structure in the action spectrum of Δ F / F (defined as [ F ( H ) − F (0)]/ F (0), cf. section ) was initially attributed to a progression in symmetric C−H vibration modes as suggested previously for tetracene ( 2 ), but this interpretation was not supported by a later study of the action spectrum of perdeuterated 1 …”

Section: Molecular Crystalsmentioning

confidence: 99%

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Singlet Fission

2010

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where he stayed and became a full professor in 1975 and served as chairman in -1984. In 1986 he held the M. K. Collie-Welch Regents Chair in Chemistry at the University of Texas at Austin, and subsequently moved to the University of Colorado at Boulder. He now shares his time equally between his research groups at Boulder and in Prague, Czech Republic, where he works at the Academy of Sciences. He is a Fellow of the American Chemical Society and a member of the U.S. National Academy of Sciences, the American Academy of Arts and Sciences, the Czech Learned Society, and the International Academy of Quantum Molecular Science. Dr. Michl's current research interests are the photophysics of solar cells; organic photochemistry; nanoscience, especially new ways of attaching molecules to metal surfaces and preparing artificial surface-mounted molecular rotors; chemistry of lithium, boron, silicon, and fluorine; and use of quantum chemical and experimental methods for better understanding of molecular electronic structure. He has been the Editor of Chemical Reviews since 1984.

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Section: Molecular Crystalsmentioning

confidence: 81%

Section: Molecular Crystalsmentioning

confidence: 87%

Section: Molecular Crystalsmentioning

confidence: 99%

Section: Molecular Crystalsmentioning

confidence: 99%

See 2 more Smart Citations

Singlet Fission

2010

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“…SF was first proposed in 1965 to explain delayed fluorescence in anthracene crystals, then invoked in crystalline tetracene to rationalize its low fluorescence quantum yield, and subsequently confirmed in pentacene crystals . SF has been observed in mixed crystals (heterofission) of anthracene doped with tetracene and pentacene doped with tetracene . More recently, tetracene, pentacene, , p -terphenyl and p -sexiphenyl, tetracyano- p -quinodimethane, , 1,3-diphenylisobenzofuran, perylene, benzophenone, and rubrene have all been shown to have SF triplet quantum yields (Φ T ) ranging from 6% to 200%.…”

Section: Introductionmentioning

confidence: 99%

Singlet Exciton Fission in Polycrystalline Thin Films of a Slip-Stacked Perylenediimide

et al. 2013

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The crystal structure of N,N-bis(n-octyl)-2,5,8,11-tetraphenylperylene-3,4:9,10-bis(dicarboximide), 1, obtained by X-ray diffraction reveals that 1 has a nearly planar perylene core and π-π stacks at a 3.5 Å interplanar distance in well-separated slip-stacked columns. Theory predicts that slip-stacked, π-π-stacked structures should enhance interchromophore electronic coupling and thus favor singlet exciton fission. Photoexcitation of vapor-deposited polycrystalline 188 nm thick films of 1 results in a 140 ± 20% yield of triplet excitons ((3*)1) in τ(SF) = 180 ± 10 ps. These results illustrate a design strategy for producing perylenediimide and related rylene derivatives that have the optimized interchromophore electronic interactions which promote high-yield singlet exciton fission for potentially enhancing organic solar cell performance and charge separation in systems for artificial photosynthesis.

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ChemInform Abstract: SINGLET EXCITON FISSION IN PURE AND DOPED ANTHRACENE

Cited by 2 publications

References 1 publication

Singlet Fission

Singlet Fission

Singlet Exciton Fission in Polycrystalline Thin Films of a Slip-Stacked Perylenediimide

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