Aluminum quinolates (Alq3) were first reported by Tang and VanSlyke in 1987 to possess electroluminescent properties and are currently widely used as materials for emission and electron-conduction layers in organic light emitting devices (OLEDs). The recent discovery by Wang and coworkers that certain organoboron quinolates such as Ph2BQ show efficient luminescence while at the same time providing good stability triggered new research efforts into boron quinolates and related species. We have developed a novel modular synthetic route to the first example of well-defined luminescent organoboron quinolate polymers. Solutions and thin films of PS-B5HTQ and PS-B3HTQ show luminescent properties similar to those of the respective molecular model compounds with bright green emission at ca. 508 - 511 nm upon excitation at 395 nm. Our new approach is highly versatile since the polymer properties can readily be fine-tuned. Thus, we have shown that substitution of the pendant aryl rings with hexyl groups leads to enhanced polymer processability. Moreover, the emission characteristics can readily be fine-tuned through the substitution pattern of the chelating ligand and the boron substituents.
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