| http://www.w3.org/ns/prov#value | - Suitable materials for the electron transport layer include, for example, tris(8-hydroxyquinolato) aluminum, 1,3-bis[5-(4-(1,1-dimethylethyl)phenyl)-1,3,4-oxadiazol-2-yl]benzene, 2-(biphenyl-4-yl)-5-(4-(1,1-dimethylethyl)phenyl)-1,3,4-oxadiazole, and other compounds as are known in the art.
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