Abstract
The delayed flourescence intensity, I DF, and phosphorescence intensity, I P, of phenanthrene-d 10 in biphenyl were observed at 77 K under various excitation light intensities, I exc. The plots of log I DF versus log I exc and log I P versus log I exc were found to deviate from linearity in the region of high excitation light intensity. The decay curves of delayed flourescence and phosphorescence were observed under various excitation durations and excitation light intensities. It was found that weaker excitation light intensity makes the delayed luminescence decay slower, while shorter excitation duration quickens the decay. The decay curves after successive double-pulse excitation were also observed. It was concluded that all the experimental results could be accounted for in terms of a single model for the emission of delayed flourescence: energy transfer between triplet phenanthrene molecules fixed in space.
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