Photophysical studies of triplet exciton processes in pure polymer films: Technical progress report for the period February 1985-July 26, 1986. [Poly (N-vinylcarbazole) (PVCA)]

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6836658

Burkhart, R D

An integrated system has been constructed to conduct experiments on time resolved photoluminescence processes into the low microsecond time regime. It is specifically designed for investigations of triplet photophysical processes in polymers and it is very sensitive providing, for the first time, triplet-triplet absorption spectra of poly(N-vinylcarbazole). A primary mission for this system is the direct detection of excited triplets using triplet-triplet absorption spectroscopy. Both spectroscopic and kinetic characteristics of polymeric triplet states have been investigated with this system. Quantitative measurements have been made of molar absorptivities, triplet quantum yields and specific rate constants for both radiative and radiationless transitions for poly(4-((vinyloxy) carbonyl)-carbazole) (PFCZ) and ot its monomeric analogue (MFCZ). In addition, specific rate constants for triplet-triplet annihilation have been evaluated for several polymers and molecularly doped polymeric systems. Additional studies include computer assisted resolution of the excimeric phosphorescence of poly(N-vinylcarbazole) and the synthesis of end-capped polystyrene molecules in order to investigate intramolecular exciton transfer. Work is also under way to determine contributions from intermolecular and intramolecular triplet exciton migration in very concentrated solutions of poly(2-vinylnaphthalene). 6 refs., 3 figs.

• Research Organization: Nevada Univ., Reno (USA)
• DOE Contract Number: FG08-84ER45107
• OSTI ID: 6836658
• Report Number(s): DOE/ER/45107-2; ON: DE87003822
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
DECAY
EFFICIENCY
KINETICS
LUMINESCENCE
MONOMERS
MULTIPLETS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHOTOLUMINESCENCE
POLYMERS
QUANTUM EFFICIENCY
REACTION INTERMEDIATES
REACTION KINETICS
SPECTRA
TRIPLETS