Exciton formation in dye doped OLEDs using electrically detected magnetic resonance
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Spie - Int Soc Optical Engineering
SPIE, the international society for optics and photonics
SPIE, the international society for optics and photonics
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Electrically Detected Magnetic Resonance (EDMR) was used to investigate the influence of dye doping molecules on spin-dependent exciton formation in Aluminum (III) 8-hydroxyquinoline (Alq(3)) based OLEDs with different device structures and temperature ranges. 4-(dicyanomethylene)-2-methyl-6-{2-[(4-diphenylamino-phenyl]ethyl}-4H-pyran (DCM-TPA) and 5,6,11,12-tetraphenylnaphthacene (Rubrene) were used as dopants. A strong temperature dependence have been observed for doped OLEDs, with a decrease of two orders of magnitude in EDMR signal for temperatures above similar to 200 K. The signal temperature dependence were fitted supposing different spin-lattice relaxation processes. The results suggest that thermally activated vibrations of dopants molecules induce spin pair dissociation, reducing the signal.
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Photonics and Optolectronics Meetings (poem) 2011: Optoelectronic Devices and Integration. Bellingham: Spie-int Soc Optical Engineering, v. 8333, p. 7, 2011.
