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Influence of exciton lifetime on charge carrier dynamics in an organic heterostructure
8.Singlet-polaron quenching has been shown to take place with rates as high as 10−9–10−10 cm3/s in tris(8-hydroxyquinolinato)aluminum (Alq3) based OLEDs (Ref. 16). Although degradation in bipolar as well as unipolar devices has been explained through the instability of Alq3 cation-radicals, alternative mechanisms attributed to quenching are possible but not yet fully understood.
13. E. D. Palik, Handbook of Optical Constants of Solids (Academic Press, Boston, 1985).
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Interactions between charge carriers and excitons, as well as between excitons and optical cavity modes in organic optoelectronic devices are fundamental to their operational limits and chief in preventing the realization of certain phenomena, such as electrically pumped organic lasing. We uncovered a previously unreported phenomenon, wherein optical cavity-modulated exciton decay rate leads to a concomitant modulation in the electrical current of an archetypal NPD/Alq3 organic light emitting device operated in forward bias. The magnitude of this variation is sensitive to the local dielectric environment of the device and is found to be as large as 15%.
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