Blue emitting materials based on bispiro-type anthracene derivatives for organic light emitting diodes

초록

Three bispiro-type molecules, 2-(10-phenylanthracen-9-yl)-bispiro(9,10-dihydro-anthracene-9,7'-7'H-fluorene-10,7"-7"H-fluorene) (1), 10-([naphthalen-2-yl]anthracen-9-yl)-bispiro(9,10-dihydro-anthracene-9,7'-7'H-fluorene-10,7"-7"H-fluorene) (2), and 10-([naphthalen-1-yl]anthracen-9-yl)-bispiro(9,10-dihydro-anthracene-9,7'-7'H-fluorene-10,7"-7"H-fluorene) (3), were synthesized by Pt-catalyzed Suzuki coupling reactions. To explore electroluminescence properties of these materials, devices were fabricated with the following structures: Indium-tin-oxide (180 nm)/4,4'-Bis(N-(1-naphthyl)-N-phenylamino)biphenyl (60 nm)/blue emitting materials (30 nm)/Bathophenanthroline (30 nm)/Lithium quinolate (2 nm)/Al (100 nm). Among devices, device using 2-(10-phenylanthracen-9-yl)-bispiro(9,10-dihydro-anthracene-9,7'-7'H-fluorene-10,7"-7"H-fluorene) showed the efficient blue emission with a luminous efficiency of 1.57 cd/A, a power efficiency of 1.83 lm/W and an external quantum efficiency of 1.83% at 20 mA/cm(2), respectively. The CIE coordinates of this device were (0.16, 0.10). (C) 2015 Elsevier Ltd. All rights reserved.

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