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By tuning cationic compositions, Cr 3+ -doped antimonate double perovskites present emissions from NIR-I to NIR-II regions. In particular, Ca 2 ScSbO 6 :Cr 3+ and Sr 2 InSbO 6 :Cr 3+ feature long-wavelength emissions with high luminescence efficiency.
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Zhao et al. (2022) studied this question.
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