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Chromium Complex Emits Light in the Coveted NIR-II Range

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BASEL, Switzerland, Aug. 17, 2021 — A team of Swiss scientists has developed the first chromium complex that emits light in the NIR-II (1000 to 1700 nm) range. The scientists achieved an NIR-II luminescence of 1067 nm by strengthening the metal-ligand bond covalence in the complex. The approach weakened the mutual repulsion between d-electrons in the emissive excited state, lowering the energy enough to cause NIR-II luminescence to occur in the new trivalent chromium (CrIII) complex. In many complexes, both electrons in a covalent bond come from the ligand. Some of these metal-ligand bonds have a partially covalent...Read full article

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