New hole-transporting amorphous molecular materials with high glass-transition temperatures (Tgs), 4,4′,4″-tris[9,9-dimethyl-2-fluorenyl(phenyl)amino]triphenylamine (TFATA) and N,N,N′,N′-tetrakis(9,9-dimethyl-2-fluorenyl)-[1,1′-biphenyl]-4,4′-diamine (FFD), have been developed. TFATA and FFD exhibit hole drift mobilities of 1.7 × 10−5 and 4.1 × 10−3 cm2V−1s−1, respectively, at 293 K at an electric-field of 1.0 × 105 Vcm−1 in their amorphous glasses. These materials permit the fabrication of thermally stable, high-performance organic light emitting diodes.
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Okumoto et al. (2000) studied this question.