Efficient green organic light-Emitting devices with a nondoped dual-functional electroluminescent material

An efficient nondoped green organic light-emitting device was demonstrated by using a dual-functional electroluminescent material, 4, 4′, 4″ -tris[8-(7,10-diphenylfluoranthenyl)] phenylamine (TDPFPA). TDPFPA was shown to be a good hole transporting [with a mobility of (1.1-1.2) × 10-4 cm2 V-1 s-1 at (1.8-5.6) × 105 V cm-1] and efficient fluorescent material with an exceptionally high glass transition temperature of 237 °C. The device with a simple structure of indium tin oxide/TDPFPA/4,7-diphenyl-1,10-phenanthroline/ LiFAl showed green emission with Commission Internationale de L'Eclairage coordinates of (0.24, 0.54), a current efficiency of 9.9 cdA, and power efficiency of 10.6 lmW. © 2007 American Institute of Physics.