| http://www.w3.org/ns/prov#value | - The charge transport layer forming mixture preferably comprises an aromatic amine compound of one or more compounds having the general formula: ##STR2## wherein R1 and R2 are an aromatic group selected from the group consisting of a substituted or unsubstituted phenyl group, naphthyl group, and polyphenyl group and R3 is selected from the group consisting of a substituted or unsubstituted aryl gro
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