ORGN 97 |
| A series of monodisperse pyrene-functionalized ethynylene-linked oligocarbazoles were synthesized and fully characterized. Moreover, their thermal, electrochemical and photoluminescent properties were investigated. Precise control on the sequence of fluorophores in oligomer resulted in different emission wavelengths. For instance, compound exhibits green emission when pyrene moiety is in the middle of the oligomers (Cz3PyCz3), while compound exhibits blue emission when pyrene moiety is at the end of the oligomers (PyCz3). To the pentacarbazole end-capped with two pyrenes (PyCz5Py), it exhibits red-shifted emission compared to the emission from tercarbazole end-capped with two pyrenes (PyCz3Py). The reason might be the excimer emission from the two pyrenes with the relative longer chain. All of these functionalized oligocarbazoles are highly fluorescent and their quantum yields are much higher than those of non-functionalized oligocarbazoles. These synthesized compounds might be good candidates for OLED display technology because oligcarbazole backbones have good hole-transporting properties while the pyrene moieties are qualified for the blue or green emission.
PL emission spectra of oligomers in cyclohexane
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Materials, Devices, and Switches
1:00 PM-5:00 PM, Sunday, 10 September 2006 Moscone Center -- Room 132, Oral
Division of Organic Chemistry |
