Synthesis, characteristics of blue electroluminescent copolymers containing fluorene unit and aliphatic non-conjugated segments
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Polyfluorenes (PFs) have been intensively studied as the blue light-emitting materials due to their high photoluminescence (PL) quantum yields in the solid-state, thermal stability, suitable solubility, and good charge transport properties [1, 2, 3, 4, 5], and various fluorene-based copolymers have been synthesized for their benefits such as having the nature of two monomers, tuning the optical properties and improving device performance. Recently, Sung-Ho Jin et al.  reported a new poly(9,9-dialkylfluorene-2,7-vinylene) (PFV), and its copolymers with various ratios of MEHPV units, efficiently tuning HOMO and LUMO binding energy levels. However, these PFV fully conjugated homopolymer or copolymers all emitted greenish-blue or green light due to the introduction of the double bond in the main chain, which increased the π–π* conjugated length. On the other hand, the application of PFs in light emitting diodes has been hampered by the appearance of green electroluminescence (ca....
KeywordsBromomethyl Quinine Sulfate Phosphonium Salt Triphenylphosphonium Polyfluorene
This work was supported by the National Nature Science Foundation of China (50473045).