| abstract |
A cover layer molecular structure, comprising a high molecular structure formed by bonding of a first center structure and a second center structure, wherein the first center structure is one of 9, 9-dimethyl-2-bromofluorene, 2-bromine-9, 9'-spirobifluorene and 2-bromine-9, 9-dibenzyl fluorene; and the second center structure is one of 3-p-toluene-4-m-toluene-diphenylamine and 4, 4'-di(3,5-xylene)-diphenylamine. |