Synthesis and electroluminescent properties of blue fluorescent materials based on 9,9-diethyl-N,N-diphenyl-9 H-fluoren-2-amine substituted anthracene derivatives for organic light-emitting diodes

摘要

Four 9,9-diethyl-N,N-diphenyl-9 H-fluoren-2-amine substituted anthracene derivatives have been designed and synthesized by Suzuki cross coupling reactions. To explore the electroluminescent properties of these bluematerials, multilayer blue organic light-emitting diodes were fabricated in the following device structure: indium tin oxide (180 nm)/N,N'-diphenyl-N,N'-(1-napthyl)-(1,1'-phenyl)-4,4'-diamine (50 nm)/blue emitting materials (1-4) (30nm)/bathophenanthroline (30 nm)/lithiumquinolate (2 nm)/Al (100 nm). All devices appeared excellent deep-blue emissions. Among them, a device exhibited a maximum luminance of 5686 cd/m(2), the luminous, power and external quantum efficiencies of 5.11 cd/A, 3.79 lm/W, and 4.06% with the Commission International de L'Eclairage coordinates of (0.15, 0.15) at 500 cd/m(2), respectively. (C) 2015 Elsevier B.V. All rights reserved.