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Two-exciton emission of BIC J-aggregates

โœ Scribed by Valey F. Kamalov; Irina A. Struganova; Yasushi Koyama; Keitaro Yoshihara

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
336 KB
Volume
226
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

We observed a blue-shift and narrowing of emission band of carbocyanine dye (BIC) J-aggregate in solution at high excitation intensity. This is explained by formation of a two-exciton state and efficient emission from the two-exciton to one-exciton state. The lifetime of the two-exciton state of BIC J-aggregate in solution is 30 ps at room temperature.

๐Ÿ“œ SIMILAR VOLUMES

Temperature dependence of superradiant e
Temperature dependence of superradiant emission of BIC J-aggregates
โœ Valey F. Kamalov; Irina A. Struganova; Tadaaki Tani; Keitaro Yoshihara ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 418 KB

The emission lifetime of the carbocyanine BIC J-aggregate decreased with the increase of the temperature in the range 20-60 K. Several mechanisms are proposed to explain the nonradiative relaxation of the J-aggregate observed in glass.

Time-resolved emission spectra of the BI
Time-resolved emission spectra of the BIC J-aggregate at low temperature
โœ Valey F. Kamalov; Irina A. Struganova; Keitaro Yoshihara ๐Ÿ“‚ Article ๐Ÿ“… 1993 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 456 KB

A red-shift and broadening of the emission of the BIC J-aggregate in glass were observed at low temperatures (4.5 K). To explain the observation a transformation of the excess excitation energy in the bath with disordering of the structure of molecular aggregate is proposed. The characteristic time

Femtosecond nonlinear optical dynamics o
Femtosecond nonlinear optical dynamics of excitons in J-aggregates
โœ Kaoru Minoshima; Makoto Taiji; Kazuhiko Misawa; Takayoshi Kobayashi ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 523 KB

Time-resolved difference absorption spectra of J-aggregates were measured by femtosecond pump-probe spectroscopy. The induced absorption near the J-band at 20 K was assigned to the transitions from n-exciton states to ( n + 1 )-exciton states (n 2 1) . The decay time of the n( > 2)-exciton states is