Novel fluorescent blue-emitting materials based on anthracene-fluorene hybrids with triphenylsilane group for organic light-emitting diodes

• Anthracene-fluorene derivatives with triphenylsilane groups were synthesized.
• Four different emitting cores are used to study the effect of structural variations on the electroluminescence performance of OLED devices.
• The introduction of triphenylsilane moieties into the anthracene-fluorene emitting cores provides non-coplanar structure, which effectively inhibits molecular aggregation and excimer formation in the solid state.

This paper reports the synthesis and electroluminescence properties of new blue-emitting materials based on anthracene-fluorene derivatives with triphenylsilane groups for organic light-emitting diodes. To study the electroluminescence properties, OLEDs were fabricated in the following sequence: ITO/4,4-Bis(N-(1-naphthyl)-N-phenylamino)biphenyl (50 nm)/newly designed blue materials (30 nm)/4,4-bis(N-(1-naphthyl)-N-phenylamino)biphenyl (30 nm)/8-Hydroxyquinolinolato-lithium (2 nm)/Al (100 nm). All devices exhibited blue electroluminescence. In particular, the device using 10-(9,9-dimethyl-2-(triphenylsilyl)-9H-fluoren-7-yl)-9-(4-(triphenylsilyl)phenyl) anthracene as the emitting material exhibited the deepest blue-emission with CIE coordinates of (x = 0.15, y = 0.09). Also, the device using (9,9-dimethyl-2-(10-(10-phenylanthracen-9-yl)anthracen-9-yl)-9H-fluoren-7-yl)triphenylsilane exhibited high luminous, power and quantum efficiencies of 2.53 cd/A, 1.94 lm/W and 1.72% at 20 mA/cm2, respectively.

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