Polyfluorene-based blue-emitting materials

Polyfluorenes are a class of promising blue light-emitting conjugated polymer due to their excellent optoelectronic properties. However, the applications of polyfluorenes in polymer light-emitting diodes (PLEDs) have been hampered by the appearance of long-wavelength green emission, leading to the problem of color purity and stability. Hence, the preparation of pure blue-emitting polyfluorenes becomes very important for the realization of real blueemitting PLEDs. In this short review, we introduce the efforts made by our group to realize polyfluorenes with pure blue emission, including the incorporation of spirobifluorene units, heterofluorene units, hyperbranched, and star-shaped structures into polymer backbones.