| http://www.w3.org/ns/prov#value | - A layer including a substance with a high electron-transporting property, a substance with a high hole-transporting property, a substance with a high electron-injecting property, a substance with a high hole-injecting property, a bipolar substance (a substance with high electron-transporting and hole-transporting properties), or the like may be as appropriate combined with the light-emitting layer
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