Extremely fast radiationless transition from the triplet state of 9,10-diazaphenanthrene |
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| Affiliation: | 1. Electronics Department, Zhejiang Univeristy, China;2. Department of Electrical and Computer Engineering, University of California Davis, Davis, CA, USA;3. Department of Electrical Engineering, National Tsing Hua University, Taiwan;4. Department of Electrical Engineering, University of California, Los Angeles, CA, USA |
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| Abstract: | The decay of the lowest excited triplet state of 9,10-diazaphenanthrene (DAP) was investigated. A surprisingly high sublevel decay rate (ky = 3.3 × 107 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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