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
Temperature dependence of superradiant emission of BIC J-aggregates
โ Scribed by Valey F. Kamalov; Irina A. Struganova; Tadaaki Tani; Keitaro Yoshihara
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 418 KB
- Volume
- 220
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
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.
๐ SIMILAR VOLUMES
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
Temperature-dependent X-ray diffraction exhibits that the J-aggregates in crystals of bis-(dimethylamino)-heptamethinium perchlorate contract unusually strong at low temperature. The intermolecular distance between the dye cations is reduced from 354 pm at room temperature to 336 pm at 30 IC The res