Photophysical Studies of Triplet Exciton Processes in Pure Polymer Films: Technical Progress Report for the Period February 1985-July 26, 1986

摘要

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. (ERA citation 12:016402)