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Medientyp:
E-Artikel
Titel:
Transfer of Electronic Excitation Energy in Polyvinyl Carbazole
Beteiligte:
Klöpffer, W.
Erschienen:
AIP Publishing, 1969
Erschienen in:
The Journal of Chemical Physics, 50 (1969) 6, Seite 2337-2343
Sprache:
Englisch
DOI:
10.1063/1.1671385
ISSN:
0021-9606;
1089-7690
Entstehung:
Anmerkungen:
Beschreibung:
The energy transfer in amorphous polyvinyl carbazole (PVCA) has been studied by fluorescence quenching experiments using perylene, trinitrofluorenone, and hexachloro-p-xylene as guest molecules. The PVCA shows excimer fluorescence. The results are discussed in terms of exciton diffusion and competition between excimer-forming sites and guest molecules for the trapping of excitons. Single-step transfer from the excimer state by dipole resonance is considered as an alternative mechanism of energy transfer; in all three cases, however, exciton migration is the more probable energy-transfer mechanism. The concentration of excimer-forming sites is estimated to be 10−3 mole/mole basic unit of the polymer. In the pure polymer the exciton covers about a thousand basic units during its lifetime.