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. 2016 Aug 9;6:31327. doi: 10.1038/srep31327

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(a,c) Emission spectra of⁴S_3/2 → ⁴I_15/2 (a) and ⁴F_9/2 → ⁴I_15/2 (c) transitions of Er³⁺ ions in NaNbO₃ nano-crystals at different magnetic fields at 77 K. (b,d) Dependence of energy change on the magnetic field for the transition⁴S_3/2 → ⁴I_15/2 emission band center at 611 nm (b) and ⁴F_9/2 → ⁴I_15/2 emission band center at 671 nm (d).