Highly Efficient Organic Light-Emitting Diodes Based on Naphthoanthracene Derivatives Containing Different Arylamines.

Herein, we designed and synthesized emitting materials based on naphthoanthracene with the different arylamino-substituents. Organic Light Emitting-Diodes (OLEDs) devices using these materials were fabricated in the following sequence; ITO/N, N '-diphenyl-N, N '-(2-napthyl)-(1,1 '-phenyl)-4,4 '-diamine (NPB) (500 angstrom)/Emitters (400 angstrom)/Alumium quinolate (Alq(3)) (150 angstrom)/lithium quinolate (Liq) (20 angstrom)/Al (1000 angstrom). All devices showed efficient emissions. In particular, a device using 4-((5,5-dimethyl-9-phenyl-5H-naphtho[3,2,1-de] anthracen-3-yl)(phenyl) amino) benzonitrile as an emitter exhibited the luminous efficiency, power efficiency, and external quantum efficiency of 9.15 cd/A, 6.36 lm/W, 2.72% at 20 mA/cm(2), respectively, with the Commission Internationale d'Enclairage (CIE) coordinates of (0.30, 0.62) at 6.0 V.