(a) XRD pattern of the LiYF4:Pr3+/Yb3+. (b) Photo of Pr3+/Yb3+ co-doped LiYF4 single crystal. (c) The standard line pattern of the orthorhombic phase LiYF4 (JCPD 77-0816).
(a) PLE spectra of the Pr3+:3P0 → 3H6 emission (606 nm, dotted) and the Yb3+:2F5/2 → 2F7/2 emission (980 nm, solid) in the 0.28 mol. % Pr3+/6.02 mol. %Yb3+ co-doped LiYF4 crystal pumped by 606 nm LD and 980 nm LD, respectively. (b) Visible-NIR PL spectra of various Pr3+/Yb3+ co-doped LiYF4 single crystals upon excitation of 480 nm LD.
Energy level scheme and downconversion mechanism for the (Pr3+,Yb3+) couple. (a) The cooperative energy transfer process. (b) The cross relaxation energy transfer process.
Decay curves of the Pr3+-Yb3+ ions co-doped LiYF4 crystal samples monitored at 606 nm under 480 nm LD excitation. The black solid lines are the stretched exponential fits for the decays.
Concentration of Pr3+ ions and Yb3+ ions in the crystals (mol.%).
Room temperature luminescence decay parameters, average decay lifetime, ETE, and QE as functions of Yb3+ concentration for χ mol. %, Pr3+/У mol. %, Yb3+ co-doped LiYF4 samples.
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