Changes in spectral frequencies and intensities recorded at low temperatures (4 to 40 K), as well as measurements of prompt-fluorescence lifetimes, of annealed and deformed high-purity single crystals of anthracene reveal that traps l013ed nt ca. 300 cm-' and 1500 cm-' below the Sr level may be ascr
β¦ LIBER β¦
Triplet excitons as probes for structural imperfections in crystalline anthracene
β Scribed by D. Goode; Y. Lupien; W. Siebrand; D.F. Williams; J.M. Thomas; J.O. Williams
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 401 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The phosphorescence and delayed fluorescence associated with triplet exciton trapping in crystalline anthracene have been used to demonstrate the physical nature of many of the traps and to determine their depth.
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The hyperfine tensors of the triplet states of several guest donor molecules in naphthaleneitetracyanobenzene host crystals have been measured by EPR s~ctroscopy. From these data the degree of charge transfer (6') in the excited state can be derived. in a straightforward way. Whereas anthracene yieI