Abstract—
We have studied broadband (1000–1600 nm) IR photoluminescence of polycrystalline corundum (α-Al2O3) samples containing copper impurity ions and additionally doped with ions of elements in the oxidation state 4+: Si4+, Ge4+, Ti4+, Zr4+, Hf 4+, and Sn4+. The results demonstrate that the IR photoluminescence intensity in corundum singly doped with copper is rather low. Additional doping of corundum with some tetravalent cations sharply increases the luminescence intensity. The largest increase in Cu2+ IR photoluminescence intensity is obtained in the case of additional doping with Ti4+, Ge4+, or Sn4+ cations. It seems likely that these ions ensure charge compensation when incorporated into the corundum lattice together with Cu2+ ions, so that the substitution process can be represented as 2Al3+ → Cu2+ + M4+ (M4+ = Ti4+, Ge4+, Sn4+,…). In this way, the additional doping of corundum with tetravalent ions raises Cu2+ solubility in α-Al2O3, leading to photoluminescence enhancement in the material.
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This work was supported by the Russian Science Foundation, grant no. 23-23-00160.
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Romanov, A.N., Haula, E.V., Kapustin, A.A. et al. Effect of Codopant Ions on the IR Photoluminescence of Cu2+ Impurity Centers in Corundum (α-Al2O3). Inorg Mater 59, 1261–1266 (2023). https://doi.org/10.1134/S0020168523110109
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DOI: https://doi.org/10.1134/S0020168523110109