Abstract:
Since the earliest reports of organic/polymeric light emitting diodes (OLEDs/PLEDs), fabricating ultrathin, full color, freeangle and largearea displays have stimulated intensive research interest around the world. To realize full color displays, high performance red, green, and blue lightemitting materials are required. In contrast to red and green emitters, only a few blue emitters showed efficient blue lightemitting 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, fluorenebased oligomers and polymers have displayed excellent thermal stabilities, fluorescent quantum yields, and electroluminescent behaviors. However, the fluorenebased 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 fluorenebased blue lightemitting 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 electrondonors and/or acceptors. A large number of literatures have demonstrated that the materials containing both electrondonating and electronwithdrawing segments could have better performance than those corresponding “holeonly” or “electrononly” materials.