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Thermally stable organic light-emitting diodes using new families of hole-transporting amorphous molecular materials

Thermally stable organic light-emitting diodes using new families of hole-transporting amorphous molecular materials,10.1016/S0379-6779(99)00335-5,Syn

Thermally stable organic light-emitting diodes using new families of hole-transporting amorphous molecular materials   (Citations: 13)
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A new family of hole-transporting amorphous molecular materials with high glass-transition temperatures (Tg) have been designed and synthesized. They include 4,4′,4″-tris[biphenyl-2-yl(phenyl)amino]triphenylamine (o-PTDATA), 4,4′,4″-tris[biphenyl-3-yl(phenyl)amino]triphenylamine (m-PTDATA), and 4,4′,4″-tris[biphenyl-4-yl(3′-methylphenyl)amino]triphenylamine (p-PMTDATA). These compounds were found to form readily stable amorphous glasses with high Tg and to function as materials for hole-injection layers in contact with the ITO electrode in multilayer organic light-emitting diodes (OLEDs). Such devices consisting of double hole-transport layers of o-PTDATA or p-PMTDATA and N,N′-di(biphenyl-4-yl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine and the emitting layer of tris(8-quinolinolato)aluminum were found to exhibit high performance and thermal stability. The devices operated at 150°C, retaining a luminance of 80% of the initial value measured at 20°C.
Journal: Synthetic Metals - SYNTHET METAL , vol. 111, no. 1-2, pp. 387-391, 2000
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    • ...For some low molecular weight materials such as starburst molecules [15], [16], which are soluble in organic solvents, the film can be formed by a solution process...

    Yutaka Ohmoriet al. Organic Devices for Integrated Photonics

    • ... molecule 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB) has a good hole transport characteristics owing to its highest unoccupied molecular orbital (HOMO) levels, and is expected to have triplet energy levels suitable to be the host for the phosphorescent material fac-tris(2-phenyl-pyridine) iridium Ir ppy . TDAPB is reported a starburst molecule with excellent hole-transporting characteristics for organic EL devices [12], [13]...

    Yutaka Ohmoriet al. Organic Light-Emitting Diodes Fabricated by a Solution Process and The...

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