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)x10(-4) cm(2) V-1 s(-1) at (1.8-5.6)x10(5) V cm(-1)] and efficient fluorescent material with an exceptionally high glass transition temperature of 237 degrees C. The device with a simple structure of indium tin oxide/TDPFPA/4,7-diphenyl-1,10-phenanthroline/LiF/Al showed green emission with Commission Internationale de L'Eclairage coordinates of (0.24, 0.54), a current efficiency of 9.9 cd/A, and power efficiency of 10.6 lm/W. (C) 2007 American Institute of Physics.