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Abstract
An Alq3 (tris-(8-hydroxyquinolinato)aluminium(III)) organic electroluminescence (EL) device has been studied from the point of view of spin chemistry. The external magnetic field effect (MFE) on the EL reveals the positive effect suggesting that the quenching of the charged spin pair from the triplet state is faster than that of the singlet state. The data also suggest that the diffusive motion of charges in this solid phase is similar to that in liquid, and the existence of semi-discrete level-crossing regions is proposed. Furthermore, the MFE on the photo-induced current from this device as an organic photovoltaic cell is also shown.
Acknowledgements
The authors are grateful to Professor P. Hore, Oxford University for his powerful organizing effort of the spin chemistry meeting 2005; his interest in many of the presentations is a great encouragement for many spin chemists. The authors are grateful to CANON Inc. for supply of the Alq3 sample device and for financial support.