A series of 2,6-disubstituted indenofluorene derivatives were obtained in high purity via a general route involving the Suzuki coupling reaction. The potential of these conjugated indenofluorenes as new organic semiconductors was demonstrated by the light-emitting diode reaching a high luminance of 1400 Cd/m 2 below 10 V.Conjugated aromatic compounds are potential candidates as organic semiconductors for use in thin-film transistors (TFTs) and light-emitting diodes (LEDs). By incorporation of strongly electronegative substituents such as fluorine 1 and cyano groups 2 into certain aromatic molecules, some important n-type compounds have been obtained for TFT applications. To develop organic LED devices (OLEDs) with uniform luminescence, saturated color, and low driving voltages, many material factors must be considered, such as emission efficiency, color purity, carrier mobility, thermal and chemical stability, and processability (for vapor-phase deposition). 3 Among those organic semiconductors known for transistor and OLED applications, the fluorene-based compounds, 4 oligomers, 5 and polymers 6 have received most attention, owing to their unique properties, availability, and processability. Since the substituted fluorenes are known to have relatively high band gaps and low HOMO levels, they are
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