Abstract
Abstract Geminate formation and recombination of the triplet excitons in the 2,3-benzocarbazole/tetracene has been studied using a dynamic technique (pulse vs. steady state excitation). In tetracene, the mode of decay of the first excited singlet state is by fission into two neighboring triplet excitons that can undergo geminate recombination. The concentration of 2,3-benzocarbazole in our samples was 20%. We monitored the geminate exciton recombination via delayed fluorescence at room temperature. Decay rates were monitored using steady state and pulsed excitations. Decay rates for the 2,3-benzocarbazole/tetracene samples were then compared with the decay rates for nongeminate recombination in naphthalene samples. We find that the geminate recombination decay rates do not depend on the duration of the excitation (pulse length). For nongeminate recombination the decay rates were found to depend on the pulse length (duration of excitation). Thus our work clearly provides a new, dynamic technique to differentiate between geminate and nongeminate recombination of triplet excitons.
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