Batagin0Neto, A*; Graeff, C F O*; Gomez, J A*; Castro, F A; Nuesch, F*; Zuppiroli, L* (2011) Exciton formation in dye doped OLEDs using electrically detected magnetic resonance. Proc. SPIE - Int. Soc. Opt. Eng., 8333. 83331B

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Abstract

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 (Alq3) 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 ~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.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Photovoltaics
Identification number/DOI:	10.1117/12.918246
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5396

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