Abstract
We report on an electron spin resonance (ESR) study of a tris(8-hydroxyquinoline) aluminum (Alq3) thin film doped highly with Mg. We observed a clear ESR signal of radical anions in the film prepared by coevaporating Alq3 and Mg (Alq3:Mg= 1:3). The g value and peak-to-peak ESR linewidth ΔHpp are obtained as 2.0030 and 2.24 mT, respectively, which coincide well with the reported values of an Alq3 thin film with a low Mg doping concentration. The spin susceptibility of the film was found to obey Curie's law, which indicates that no interaction exists between spins of Alq3 anions. The doped charges are found to be localized at deep trapping sites by lineshape analysis and from the temperature dependence of ΔHpp. The doping concentration was evaluated to be 4.3%. This low doping concentration can be explained by the formation of Mg clusters in the film, which was directly confirmed by transmission electron microscopy.
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