High thermal stability fluorene-based hole-injecting material for organic light-emitting devices

Novel N-1,N-3,N-5-tris(9,9-diphenyl-9H-fluroen-2-yl)-N-1,N-3,N-5-triphenylbenzene-1,3,5-triamine (TFADB) was synthesized and characterized as a hole-injecting material (HIM) for organic light-emitting devices (OLEDs). By incorporating fluorene group TFADB shows a high glass-transition temperature T-g > 168 degrees C, indicative of excellent thermal stability. TFADB-based devices exhibited the highest performance in terms of the maximum current efficiency (6.0 cd/A), maximum power efficiency (4.0 lm/W), which is improved than that of the standard device based on 4-4'-4 '' Tris(N-(naphthalene-2-yl)-N-phenyl-amino)triphenyla mine (2T-NATA) (5.2 cd/A, 3.6 lm/W). This material could be a promising hole-injecting material, especially for the high temperature applications of OLEDs and other organic electronic devices. (C) 2016 Published by Elsevier B.V.