Accession Number:

AD0725863

Title:

Excimer Fluorescence of Poly(N-Vinylcarbazole).

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY

Personal Author(s):

• Johnson,P. C.
• Offen,H. W.

Report Date:

1971-06-01

Pagination or Media Count:

19.0

Abstract:

Fluorescence spectra and lifetimes of carbazole, 1,3-bisN-carbazolyl-propane and polyN-vinylcarbazole have been studied as a function of pressure to 30 kbar at room temperature and 77K. Polymer films show exclusively excimer fluorescence tau 43 nsec at room temperature. This is not quenched at 77K but appears together with a new emission tau 12 nsec attributed to traps arising from exciton coupling between adjacent carbazole chromophores. The comparative P,T response of the three compounds suggests that excimers do not form between adjacent chromophores in the amorphous polymer. Author

Descriptors:

• (*NITROGEN HETEROCYCLIC COMPOUNDS
• *FLUORESCENCE)
• (*POLYMERS
• FLUORESCENCE)
• EXCITONS
• MOLECULAR ENERGY LEVELS
• RELAXATION TIME
• ELECTRON TRANSITIONS
• VINYL PLASTICS

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE