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- W2077746721 abstract "Abstract The phenomenon of triplet-triplet annihilation in the following mixed crystal systems is discussed: phenanthrene-h10 in biphenyl, phenanthrene-d10 in biphenyl, naphthalene-h8 in biphenyl, naphthalene-d8 in biphenyl and chrysene in biphenyl. The kinetics of the phenomenon are elaborated, particular attention being paid to tthe effects of (i) host-guest triplet energy gaps; (ii) random walk of triplet host excitons; and (iii) the influence of adventitious impurity or host crystalline defects. The topics discussed and concerning which experimental information is presented are: (a) the decay behavior of phosphorescence and delayed fluorescence; (b) the temperature dependence of the above decays; (c) the growth characteristics of phosphorescence and delayed fluorescence; (d) the temperature dependence of phosphorescence and delayed fluorescence intensities; (e) the concentration dependence of delayed fluorescence intensity; and (f) the incident intensity dependence of phosphorescence and delayed fluorescence intensities. It is shown that all data, with the single exception of delayed fluorescence decay at T ∼ T 77°K, are in accord with the kinetic model developed. The decay behavior of delayed fluorescence at 77°K is interpreted in terms of a crystal defect model. Exception is taken to the model of Hadley, Rast and Keller for the temperature dependence of phosphorescenc decay; it is shown that the annihilative model is in better accord with fact." @default.
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- W2077746721 date "1968-06-01" @default.
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- W2077746721 title "Delayed luminescence of organic mixed Crystals. IV. Triplet-Triplet Annihilation Phenomena" @default.
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- W2077746721 doi "https://doi.org/10.1080/15421406808082915" @default.
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