# DELAYED FLUORESCENCE OF MIXED CRYSTALS.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/14846

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 Title: DELAYED FLUORESCENCE OF MIXED CRYSTALS. Creators: Misra, T. N.; McGlynn, S. P. Issue Date: 1965 Publisher: Ohio State University Abstract: Delayed fluorescence of a number of mixed crystals has been investigated for systems which have guest $S_{1}$ and $T_{1}$ states lower respectively than host $S_{1}$ and $T_{1}$ states, for example, phenanthrene, naphthalene and $naphthalene-d_{8}$ guests in biphenyl host, and triphenylene and $naphthalene-d_{8}$ guests in durene host. Delayed fluorescence seems to be a fairly general characteristic of these host-guest system. The experimental results can be interpreted reasonably in terms of two types of annihilation: homogenous annihilation between two similar triplets (guest-guest or host-host) and heterogeneous annihilation between a host triplet and a guest triplet. The type of triplet kinetics encountered is complex: it depends on temperature, excitation intensity, guest concentration and time. It also depends on the energy interval between $T_{1}$ (guest) and $T_{1}$ (host) and on the transfer efficiencies of the host triplet exciton band. Description: Author Institution: Department of Chemistry, Louisiana State University URI: http://hdl.handle.net/1811/14846 Other Identifiers: 1965-M-6