Blue Electroluminescent Dibenzofuran-Substituted Bianthracene Derivatives for Organic Light-Emitting Diodes

초록

In this study, 4 blue electroluminescent materials based on bianthracene derivatives were synthesized and characterized. Bianthracene derivatives have outstanding photophysical and electroluminescence properties such as good thermal stability and high quantum yield. End-capping groups such as phenyl, dibenzo[b,d]furan, naphthalene and pyrene were introduced to prevent intermolecular interaction and improve electroluminescence (EL) properties. To investigate their EL properties, multilayered devices were fabricated with the following sequences; indium tin oxide (180 nm)/N, N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (60 nm)/blue emitting materials (30 nm)/bathophenanthroline (30 nm)/lithium quinolate (2 nm)/Al (100 nm). Interestingly, a device using 10-(dibenzo[b,d]furan-4-yl)-9-(10-(dibenzo[b,d]furan-4-yl)anthracen-9-yl) anthracene showed good EL properties with a luminance, luminous-, power-, and external quantum efficiency of 3112 cd/m(2), 2.91 cd/A, 1.60 lm/W, and 2.11% at 30 mA/cm(2), respectively. The Commission Internationale de l'Eclairage coordinates of this device were (x = 0.17, y = 0.14) at 6.0 V.

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