Abstract
Starting from N,N -diarylsubstituted
thioureas 20 and thioacetamides 21 a series of heterocyclic analogous of N,N′ -perarylated phenylene-1,4-diamines
and benzidines was obtained. These compounds represent, as studied
by DSC measurements, a new class of hole transporting materials
with high thermal stability and high tendency to form stable amorphous
states. Moreover, some of the new compounds are, as measured by
cyclic voltammetry, easily reversibly oxidized indicating the formation
of persistent radical ions. Such compounds, which are, in general,
completely substituted by aryl groups at their heterocyclic moieties,
have been successfully used as hole-transport materials in OLEDs.
Key words
heterocyclization - hole transport materials -
N -perarylated 2-aminothiophenes -
N -perarylated 2-aminothiazoles
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