Deep‐Blue OLED Fabrication from Heptazine Columnar Liquid Crystal Based AIE‐Active Sky‐Blue Emitter

A newly discovered electron‐deficient s‐Heptazine discotic core has been used for organic light emitting diodes (OLEDs) applications. The compound exhibits aggregation‐induced emission (AIE) characteristic, while most of other discotics reported so far, show aggregation‐caused quenching (ACQ) behavior. It (Hpz‐3C12) shows sky‐blue light emission in a solid state while weakly emissive in the solution state. The solution‐processed OLEDs have been fabricated from Hpz‐3C12 by using host‐guest configuration by doping with different hosts and found to display deep‐blue emission. The device shows the best efficiency with CBP‐host with 3 wt. % dopant (Hpz‐3C12) concentration. A novel electron‐deficient heptazine based columnar liquid crystal exhibit AIEE phenomena. Deep‐blue OLEDs have been fabricated by using host‐guest configuration from the sky‐blue emitter Hpz‐3C12 by using different hosts and it shows the best efficiency with CBP host at 3 wt. % dopant concentration.