Raman spectroscopic study of pure p-terphenyl and tetracene:p-terphenyl doped crystals
β Scribed by A.M Amorim da Costa; N Karger; A.M Amado; M Becucci
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 411 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0167-2738
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π SIMILAR VOLUMES
A picosecond laser system has been employed to study the kmetics of singlet evciton energy transfer m p-terphenyl single crystals doped with tetracene over the temperature range 77-300 K. First-order kinetics prevail and exciton migration from host to guest is controlled by thermal activation over a
The results of a preliminary investigation of the growth and nlorphology of p-terphenyl crystals grown by sublimation and by solvent evaporation methods are reported. It was observed that lozenge-shaped (001) crystal plates are obtained from xylene and benzene solution while dendritic crystals by su
The relative intensities, at 4.2 K, of fluorescence lines attributed to tetracene guests in different sites of a p-terphenyl host crystal are shown to depend on the rate of cooling of the crystal between 240 and 140 K across the disorder-order phase transition. This observation reflects the kinetics