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Synthesis and Characterization of Oxazaborinin Phosphonate for Blue OLED Emitter Applications |
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| Authors: | Jonas Köhling Dr Volodymyr Kozel Dr Vladislav Jovanov Dr Romana Pajkert Dr Sergey N Tverdomed Oleg Gridenco Malte Fugel Prof Dr Simon Grabowsky Prof Dr Gerd-Volker Röschenthaler Prof Dr Veit Wagner |
| Institution: | 1. Department of Physics and Earth Sciences, Jacobs University gGmbH, Campus Ring 1, 28759 Bremen, Germany;2. Department of Life Sciences and Chemistry, Jacobs University gGmbH, Campus Ring 1, 28759 Bremen, Germany;3. Semiconductor Optics, Institute of Solid State Physics, University of Bremen, 28359 Bremen, Germany;4. Institute of Inorganic Chemistry and Crystallography, University of Bremen, 28359 Bremen, Germany |
| Abstract: | A blue-light emitting material based on a boron complex containing heteroaromatic phosphonate ligand is synthesized and characterized. The Phospho-Fries rearrangement is used in the synthesis route of the ligand as a convenient method of introducing phosphonate groups into phenols. Structural, thermal and photophysical properties of the resulting oxazaborinin phosphonate compound have been characterized. DFT geometry optimizations were studied as well as the spatial position and symmetry of the HOMO and LUMO. Good thermal stability up to 250 °C enables vacuum deposition methods next to solution processing. Combining the work function with the optical band gap from UV-Vis measurements shows that band alignment is possible with standard contact materials. Photoluminescence reveals an emission peak at 428 nm, which is suitable for a blue light-emitter. |
| Keywords: | difluoroboronic compound fluorescence materials science N O ligands Phospho-Fries rearrangement |