2007
DOI: 10.1016/j.chemphys.2006.12.004
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Exciton relaxation in nanotubular TPPS4 aggregates in water solution and in polymeric matrix

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Cited by 20 publications
(18 citation statements)
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“…The highest spectroscopic aggregation number—a coherence length of 12.9 molecules—obtained from the width of the 490 nm band was realized for an aggregate with a hydrodynamic radius of 56 nm. A similar exciton delocalization over about 10 molecules was estimated for the narrow high‐energy J‐band at 490 nm by ultrafast transient absorption and fluorescence spectroscopy 130. However, as revealed by this study, the exciton becomes rapidly localized on only one to two molecules after its relaxation to the lowest exciton J‐band at 707 nm, where propagation is only possible in a noncoherent way.…”
Section: Chlorophyll Dyes and Structurally Related Macrocyclic Tetsupporting
confidence: 82%
“…The highest spectroscopic aggregation number—a coherence length of 12.9 molecules—obtained from the width of the 490 nm band was realized for an aggregate with a hydrodynamic radius of 56 nm. A similar exciton delocalization over about 10 molecules was estimated for the narrow high‐energy J‐band at 490 nm by ultrafast transient absorption and fluorescence spectroscopy 130. However, as revealed by this study, the exciton becomes rapidly localized on only one to two molecules after its relaxation to the lowest exciton J‐band at 707 nm, where propagation is only possible in a noncoherent way.…”
Section: Chlorophyll Dyes and Structurally Related Macrocyclic Tetsupporting
confidence: 82%
“…Eine ähnlich große Delokalisierung des Excitons über ca. 10 Moleküle wurde für die schmale, höherenergetische J‐Bande bei 490 nm durch ultraschnelle transiente Absorptions‐ und Fluoreszenzspektroskopie nachgewiesen 130. Diese Untersuchungen zeigten jedoch darüber hinaus, dass das Exciton sehr schnell auf ein bis zwei Moleküle lokalisiert wird, nachdem es zur tiefer liegenden J‐Bande bei 707 nm relaxiert ist, wo eine Excitonenübertragung dann nur noch auf nichtkohärentem Weg möglich ist.…”
Section: Chlorophylle Und Strukturverwandte Makrocyclische Tetrapyunclassified
“…The origin of the short lived species ∼ 1 = 65 ± 10 ps is assigned as boron mediated J-aggregates of TPPS 4 and long lived species ∼ 2 = 3.87 ± 0.1 ns to TPPS 4 -borate complex [34]. The observed lifetime of J-aggregates in the glass is shorter than the J-aggregates of TPPS 4 (150 ps) in solution and in polymer matrix [35,36]. This suggests that the J-aggregates in the glass matrix undergo strong bimolecular exciton-exciton annihilation.…”
Section: Time Resolved Fluorescence Emissionmentioning
confidence: 91%