Fluorescence from exciplex formed by N,N’-bis(3-methylphenyl)-N,N’-diphenylbenzidine (TPD) and 2-(4-biphenyl)-5- (4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) in inert polymer poly-methyl methacrylate (PMMA) was studied with fluorescence spectra and transient emission decay measurements. Equivalent weight of the donor and acceptor were incorporated into the matrix with various ratio (5 ~ 80 wt%), showing emission composed of exciplex and the donor molecule. Emission decay curves were well fitted with bi-exponential functions which was derived by a model including exciplex decay and back-and-forth transition to non-emissive states as triplex exciplex. Parameters for decay and intersystem crossing and reverse intersystem crossing was obtained. Their dependence on dopant concentrations indicated that the exciplex formation process was strongly affected by nominal intermolecular distance. The results indicated that in highly concentrated films, donor and acceptor in the samples separately made nano-aggregation with the same types of molecules.
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