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

• We synthesized blue emitters based on bispiro-type anthracene derivatives.
• These materials showed the efficient deep-blue electroluminece.
• Bispiro-type emitters have great potential for blue emitters in OLEDs.

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/cm2, respectively. The CIE coordinates of this device were (0.16, 0.10).

Figure optionsDownload as PowerPoint slide