Blue organic light-emitting diodes based on phenyl-bridged fluoranthene and triphenylene derivatives

• We synthesized fluoranthene and triphenylene derivatives.
• The EL efficiencies of materials depend on the degree of self-aggregation.
• These materials have great potential for applications as blue emitter in OLEDs.

In this study, we have designed and synthesized blue emitters based on fluoranthene and triphenylene via Diels–Alder reaction. To investigate EL properties, multilayered OLEDs were fabricated by using these materials as emitting materials. The device structure was ITO / NPB / (50 nm) / Blue emitting materials (30 nm) / Bphen (30 nm) / Liq (2 nm) / Al. In particular, a device showed blue EL properties with luminous, power, and external quantum efficiencies of 2.34 cd/A, 1.18 lm/W, 1.36% at 20 mA/cm2, and the CIE coordinates of (0.17, 0.23) at 6 V, respectively. The balanced charge injection properties of devices as well as the nonplanar structures of the emitting materials have the profound effects on the EL efficiencies.

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