Fluorescence and phosphorescence emission and nonradiative relaxation of acridine in a crystalline matrix of 2,3-dimethylnaphthalene
✍ Scribed by O Morawski; J Prochorow
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 483 KB
- Volume
- 242
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The results of experimental studies of fluorescence and phosphorescence of acridine, selectively excited within its absorption band, in a crystalline host lattice of 2,3-dimethylnaphthalene, are reported. The energies of the first excited singlet and triplet states of acridine in this crystalline matrix were determined. The spectra of both emissions display a broadening caused by the orientational disorder of the host lattice. The intensity and the decay time of the fluorescence and phosphorescence show moderate temperature dependence (in the 4.2-300 K temperature range). It is concluded that over the whole temperature range the most important mode of the nonradiative relaxation of the excited acridine molecule is that of the (nearly) temperature-independent intersystem crossing from the Sl("rl" , "iT * ) singlet to the T3("rc, 'rr * ) and/or T2(n, Ir * ) triplet states.