PHOTO-ACTIVE AND ELECTROACTIVE AMORPHOUS MOLECULAR MATERIALS - MORPHOLOGY, STRUCTURES, AND HOLE TRANSPORT-PROPERTIES OF TRI(BIPHENYL-4-YL)AMINE

Tri(biphenyl-4-yl)amine is found to constitute a new class of photo- and electro-active amorphous molecular materials. The material readily forms an amorphous glass with a glass-transition temperature of 76-degrees-C, as characterized by differential scanning calorimetry, X-ray diffraction and Raman spectroscopy. Its glass-forming properties are discussed in the light of its molecular and crystal structures determined by X-ray crystallography. The material in the glassy state shows a relatively high hole drift mobility of 1.5 x 10(-4) cm2 V-1 s-1 at an electric field of 2 x 10(5) V cm-1 at 20-degrees-C. Temperature and electric-field dependencies of the hole drift mobility in the glassy state of TBA are discussed.