Abstract:Since the earliest reports of organic/polymeric light emitting diodes (OLEDs/PLEDs), fabricating ultrathin, full color, free angle and large area displays have stimulated intensive research interest around the world. To realize full color displays, high performance red, green, and blue light emitting materials are required. In contrast to red and green emitters, only a few blue emitters showed efficient blue light emitting materials can be used as not only emissive layer in OLEDs/PLEDs, but also host materials for efficient blue and white light source. Among the promising blue emitters, fluorene based oligomers and polymers have displayed excellent thermal stabilities, fluorescent quantum yields, and electroluminescent behaviors. However, the fluorene based electroluminescent blue materials usually exhibited inferior electroluminescence efficiency, poor color purity and spectral stability caused by weak charge injection and transport, aggregation/excimer formation, and/or the fluorenone of photooxidized fluorene. The progress of the fluorene based blue light emitting compounds and polymers was reviewed. The key point of the review was paid to the design, synthesis, and electroluminescent performance of oligofluorenes and polyfluorenes with electron donors and/or acceptors. A large number of literatures have demonstrated that the materials containing both electron donating and electron withdrawing segments could have better performance than those corresponding “hole only” or “electron only” materials.