Patent ID: 7951874

Claim:
A K type of copolyarylborane: wherein: hydrogen atoms are bonded to the ends; Ar n represents at least one of Ar 1 , Ar 2 , and Ar 3 ; Wherein Ar 1 and Ar 2 , independent of each other, are selected from mono (homo)aromatic arylenes, and polycyclic heteroaromatic arylenes; Ar 3 represents an heteroaromatic arylene radical; and each of Ar 1 , Ar 2 , and Ar 3 is bonded in the K type of copolyarylborane in a bivalent conjugating manner; Ar 1 has π electron density of no less than that of benzene; Ar 2 is capable of hole transport; Ar 3 has a π electron density of no greater than that of benzene and less than that of Ar 1 ; wherein Ar 1 is different from Ar 2 and Ar 3 and wherein Ar 2 is different from Ar 3 ; x, y, and z respectively represent the molar parts of Ar 1 , Ar 1 , and Ar 3 ; each of x, y, and z is in the range of 0-1, and x+y+z=1, wherein two of x, y, and z are not equal to 0; and depending on the intended conjucation in the K type of copolyarylborane, R represents one of the following radicals: (1) a heteroaromatic or a (homo)aromatic aryl radical, which is donor-free, wherein R's conjugation in the copolyarylborane is formed by application of an electrical field; (2) a heteroaromatic or a (homo)aromatic aryl in which at least one additional donor function is substituted (intrinsic formation of conjugation); and (3) a heteroaromatic or a (homo)aromatic aryl whose hydrogen atom(s) is substituted by one or more branched or unbranched alkyl radicals or alkoxy radicals R*.