Improved performance of organic light-emitting diodes using advanced hole-transporting materials

A new class of aryl amine derivatives, which contains phenylnaphthyldiamine core, has been synthesized and examined as a hole-transporting material (HTM) for organic light-emitting diodes (OLEDs). These phenylnaphthyldiamine derivatives possess high radical cation stabilities and high morphologic stabilities relative to their biphenyldiamine analogs. Theoretical experiments and OLED device fabrication were carried out to study their better hole-transporting properties. The electroluminescent devices with the phenylnaphthyldiamine derivatives HTM 2-4 as the hole-transporting layer were more efficient than that with the biphenyldiamine HIM 1. (C) 2009 Elsevier B.V. All rights reserved.