Organic electroluminescent devices using novel starburst molecules, 1,3,5-tris[4-(3-methylphenyl-phenylamino)phenyl]benzene and 4,4',4''-tris(3-methylphenylphenylamino)triphenylamine, as hole-transport materials

Organic electroluminescent devices using novel starburst molecules, 1,3,5-tris[4-(3-methylphenylphenylamino)phenyl]benzene (m-MTDAPB) and 4,4',4 ''-tris(3-methylphenylphenylamino)triphenylamino (m-MTDATA), as hole-transport materials and tris(8-quinolinolate)aluminium (Alq(3)) as an emitting material were fabricated and their performance characteristics examined. The starburst molecules were found to function as excellent hole-transport materials. The ITO/m-MTDATA(300 Angstrom)/m-MTDATAPB(200 Angstrom)/Alq(3)(500 Angstrom)/MgAl device exhibited a luminance of cd 17,000 cd m(-2) at a driving voltage of 16 V and aluminous efficiency of 1.91 m W-1 at a luminance of 300 cd m(-2).