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. 2016 May 4;6:24884. doi: 10.1038/srep24884

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Copyright © 2016, Macmillan Publishers Limited

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The LPL spectra of the Pr³⁺ (a,b), Yb³⁺ (c,d) single doped and Pr³⁺-Yb³⁺ codoped (e,f) samples recorded at 30 s after ultraviolet (UV) lamp (254 nm) irradiation for 15 min, the red dots are the LPL spectra of Pr³⁺ single doped sample for comparison and and the (f) shows the LPL spectra in different atmospheric preparation condition.