Synthesis, Photophysics, and Electroluminescence of Poly(dibenzofluorene)s

Abstract

AbstractSummary: A series of soluble poly(dibenzofluorene) derivatives that contain dibenzo[a,g]fluorene, dibenzo[a,i]fluorene, and dibenzo[c,g]fluorene repeat units in the main chain have been synthesized, characterized, and explored as emissive materials in polymer light emitting diodes (PLEDs). These polymers possess higher glass transition temperatures (108–133 °C) than that of poly(2,7‐(9,9‐dialkyl)fluorene) (PFO). The photophysical and electrochemical properties of these polymers are affected by the steric hindrance effect. These polymers emit blue light in dilute solution (378–400 nm) and in the solid state (426–447 nm). As emissive materials in PLEDs, blue electroluminescence with a brightness of up to 3 130 cd · m−2 is obtained from single‐layer diodes of P2 with aluminum/barium in air.The photophysical and electrochemical properties of these polymers are affected by the size effect.magnified imageThe photophysical and electrochemical properties of these polymers are affected by the size effect.