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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 character, which reduces the energy of certain excited states, causing the emitted radiation to have a longer wavelength. This phenomenon has been…READ MORE