Organic Electroluminescent Devices Using Novel Starburst Molecules, 1,3,5-Tris[4-(3-Methylphenyl-Phenylamino)Phenyl]Benzene And 4,4′,4″-Tris(3-Methyl-Phenylphenylamino)Triphenylamine, as Hole-Transport Materials

Abstract

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)triphenylamine (m-MTDATA), as hole-transport materials and tris(8-quinolinolate)aluminium (Alqs) 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(300Å)/m-MTDAPB(200Å)/Alq₃(500Å)/MgAl device exhibited a luminance of ca. 17,000 cd m⁻² at a driving voltage of 16 V and a luminous efficiency of 1.9 1m W⁻¹ at a luminance of 300 cd m⁻².