| abstract |
A compound of formula [Ar1]m[Ar2]n wherein: m is from 1-3 and n is from 1-2; Ar1 is optionally substituted- dibenzo[b,e][1,4]dioxine, phenoxanthine, thianthrene, dibenzo[b,e]1,4-thiaselenane or selenanthrene having a linkage to Ar2 at one or two positions selected from ring positions 1-4 and 5-8; Ar2 represents a residue derived from an arylamine in which the aryl rings are optionally substituted- phenyl, naphthyl or anthracenyl, a polycyclic fused/chain aromatic ring system optionally containing nitrogen or sulphur and in a chain aromatic ring system optionally containing one or more chain oxygen or sulphur atoms, a triarylphosphine oxide or an arylsilane, the rings of any of which are optionally substituted. These compounds exhibit high hole mobility and/or high glass transition temperatures. The compounds may be used in electron transport layers, may be doped with p-type dopants, incorporated into OLEDs, organic photovoltaic devices, imaging members or thin-film transistors. Preferred compounds include 1-anthracenyl-9-yl-thianthrene, 1-biphenyl-4-yl-thianthrene and 9,10-Bis(1- thianthrenyl)anthracene. |