Triplet excimer-monomer equilibria as structural probes in pure and molecularly doped polymers
- Univ. of Neveda, Reno, NV (United States)
Solid films of vinyl aromatic polymers usually emit an excimeric type of phosophorescence at temperatures of 77 K or greater. At temperatures near 10 K these emission spectra are definitely nonexcimeric and at intermediate temperatures the two types of emission coexist. Using the assumption that triplet excimers are formed by trapping at an excimer-forming site, activation energies have been determined for both trapping and detrapping by measuring rates of decay of the excimeric and nonexcimeric emission. The activation energies for trapping of a given chromophore are independent of whether that chromophore is bonded to a chain backbone or present as a small molecule dopant in a polystyrene matrix. The activation energies for detrapping are potentially valuable as an indicator of microstructure for polymers containing a chromphoric group that is phosphorescent. 14 refs., 2 figs., 1 tab.
- DOE Contract Number:
- FG08-84ER45107
- OSTI ID:
- 81772
- Report Number(s):
- CONF-910402-; TRN: 95:016850
- Resource Relation:
- Conference: 201. American Chemical Society (ACS) national meeting, Atlanta, GA (United States), 14-19 Apr 1991; Other Information: PBD: 1993; Related Information: Is Part Of Structure-property relations in polymers: Spectroscopy and performance; Urban, M.W.; Craver, C.D. [eds.]; PB: 820 p.
- Country of Publication:
- United States
- Language:
- English
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