Abstract
The decay of the lowest excited triplet state of 9,10-diazaphenanthrene (DAP) was investigated. A surprisingly high sublevel decay rate ( k y = 3.3 × 10 7 s −1) in biphenyl and fluorene hosts was found at 3.0 K from the decay of a time-resolved EPR (TREPR) signal. This high decay rate was confirmed by a lifetime measurement of the delayed fluorescence using a picosecond laser and photon counting system. The nature of the fast radiationless transition is discussed.
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