M. Thelakkat et al., SYNTHESIS AND PROPERTIES OF NOVEL HOLE TRANSPORT MATERIALS FOR ELECTROLUMINESCENT DEVICES, Macromolecular symposia, 125, 1998, pp. 157-164
We synthesized low molecular weight triphenyldiamines (TPDs), novel 1,
3,5-tris(diarylamino)benzenes (TDABs), polymeric triphenyldiamines and
insoluble triphenylamine networks based on tris(4-ethynylphenyl)amine
as hole transport materials for electroluminescent displays. The HOMO
energy values as determined from cyclic voltammetry measurements for
TPDs and TDABs are between -4.97 and -5.16 eV. By using a polymeric TP
D as hole transport layer and tris(8-quinolinolato) aluminium as emitt
er, LEDs with an onset voltage of 3V and a luminance up to 900 cd/m(2)
were obtained under ambient conditions.