| http://www.w3.org/ns/prov#value | - Here, the substance having high electron transporting property is, for example, a metal complex having quinoline skeleton or benzoquinoline skeleton, such as tris(8-quinolinolato)aluminum (Alq3), tris(5-methyl-8-quinolinolato)aluminum (Almq3), bis(10-hydroxybenzo[h]-quinolinolato)beryllium (BeBq2), bis(2-methyl-8-quinolinolato)-4-phenylphenolato-aluminum (BAlq) and the like.
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