Low-lying electronically excited states of C60 and C70 and measurement of their picosecond transient absorption in solution

Lee, Minyung; Song, Ok‐Keun; Seo, Jung Chul; Kim, Dongho; Suh, Yung Doug; Jin, Seung Min; Kim, Seong Keun

doi:10.1016/0009-2614(92)85976-h

Cited by 111 publications

(38 citation statements)

References 17 publications

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“…Although it shows a small elongation of the lifetime at S 1 , this finding clearly indicates the great reduction of nonradiative relaxation channels, other than the very efficient intersystem crossing to the triplet state (F T % 0.96), [26] by solute-solvent interactions to the ground state.…”

mentioning

confidence: 82%

Dimeric Capsules with a Nanoscale Cavity for [60]Fullerene Encapsulation

Park

Kwon

Lee

et al. 2008

Chemistry A European J

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The acid-assisted and guest-induced formation of superstructures was achieved by the addition of haloacetic acids to a toluene solution of the resorcin[4]arene derivatives 1 and [60]fullerenes. The formation of dimeric superstructures that encapsulated a nanosized guest molecule was observed when appropriate acids, such as haloacetic acids, and suitable guest molecules, such as [60]fullerenes, were co-added to a toluene solution of cavitand 1 that has four pyridine units, whereas a complicated equilibrium between several species was detected without [60]fullerenes, and the formation of discrete superstructures was not monitored in the absence of haloacetic acids. The spectroscopic data indicate that the formed [60]fullerene-encapsulated complexes have the structure of 2. These complexes are self-assembled through pyridinium-anion-pyridinium interactions and by pi-pi and van der Waals interactions. The rate of decomplexation of 2 is estimated to be 3.1 s(-1) from a 2D exchange NMR spectrum. The [60]fullerene encapsulation process can be controlled by modifying the amounts of acids used, changing the temperature of the system, altering the ratio of acid/base, and even through varying the solvent polarity. Moreover, the fluorescence spectra show band-narrowing spectral changes and a retardation of the relaxation characteristics of isolated and isotropic [60]fullerenes, which indicates that the environmental change around [60]fullerene is induced upon its encapsulation.

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mentioning

confidence: 82%

Dimeric Capsules with a Nanoscale Cavity for [60]Fullerene Encapsulation

Park

Kwon

Lee

et al. 2008

Chemistry A European J

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“…where s obs , the observed |0)S 1 lifetime is 1.3 ns [14,15], and the sum of / f (the fluorescence quantum yield) and / IC (the IC yield) is obtained from one minus the intersystem crossing (ISC) yield / ISC = 0.96 given by Ref. [16].…”

Section: Theoretical Modelmentioning

confidence: 99%

Study of transient thermal lensing effect in C60-toluene solution

Chang

Leu

Wei

et al. 2010

Chemical Physics Letters

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“…À partir des équations (30) et (31), la dispersion des polaritons (linéaires) peut être reconstruite. Le résultat est montré sur la figure 5 b.…”

Section: /R|unclassified

“…Afin de décrire l'absorption non linéaire de la molécule de do, plusieurs auteurs proposent un modèle à cinq niveaux [31,32]. Chaque état électronique de la molécule est associé à un grand nombre d'états vibroniques.…”

Section: Limitation Optique Dans C«)unclassified

“…Les courbes en pointillé donnent le résultat calculé pour les positions des raies dédoublées discutées avant. On voit bien que, pour une densité n p < 2.10 13 cm" 3 photons du faisceau pompe, une seule solution des équations (30) et (31) existe et que pour n p > 10 15 cm" 3 les effets de saturation interviennent. Pour ajuster la théorie aux points expérimentaux ils faudrait augmenter largement les constantes d'amortissement intervenant dans la matrice densité.…”

Section: H(ù P = E(q) + E(k)unclassified

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Méthodes expérimentales de l'optique non linéaire

Hönerlage

1998

l'Optique Non Linéaire Et Ses Matériaux

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Résumé : Dans cet article, nous discutons les différentes techniques et méthodes expérimentales utilisées en spectroscopic optique non linéaire. En particulier, nous considérons les changements d'absorption et de dispersion des matériaux soumis à une forte intensité d'excitation, des mesures de photoluminescence et de gain optique ainsi que du mélange à quatre ondes dans différentes configurations. Dans nos exemples, nous appliquons principalement ces méthodes à des semiconducteurs possédant des zones interdites directes et dipôles actives où des quasi-particules électroniques peuvent être excitées en résonance. Nous obtenons ainsi des informations sur leur durée de vie et de cohérence, les processus de collision et de relaxation d'énergie ainsi que sur les propriétés de transport de ces matériaux.

show abstract

Low-lying electronically excited states of C60 and C70 and measurement of their picosecond transient absorption in solution

Cited by 111 publications

References 17 publications

Dimeric Capsules with a Nanoscale Cavity for [60]Fullerene Encapsulation

Dimeric Capsules with a Nanoscale Cavity for [60]Fullerene Encapsulation

Study of transient thermal lensing effect in C60-toluene solution

Méthodes expérimentales de l'optique non linéaire

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