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Plokker, M.P. (author), Hoogsteen, W. (author), Abellon, R.D. (author), Krämer, K. W. (author), van der Kolk, E. (author)The concentration dependent luminescence of the SrI<sub>2</sub>-TmI<sub>2</sub> system was investigated. For Tm<sup>2+</sup> concentrations up to 5 mol %, the quantum efficiency (QE) of the <sup>2</sup>F<sub>5/2</sub>→<sup>2</sup>F<sub>7/2</sub> emission exhibits a constant value above 50%. The QE drops for higher Tm<sup>2+</sup>...journal article 2020