Enhancement of up-conversion luminescence through doping Ce3+ ions in YbxEr2−xTi2O7 thin films

Study on the Up-Conversion Luminescence and Conductivity Behavior of p-Type NiO:Yb,Er Thin Films

“…A possible reason is that the doped Li + ions affected the position of Ni 2+ which reduced the symmetry of the crystal field and then enhanced the UC emission intensity. A similar phenomenon has also be reported in Ce + -doped TiO 2 :Yb,Er films and Gd 3+ -doped ErYbGdTiO composite nanophosphor [ 31 , 32 ]. In addition, the relationship between UC intensity and exciting power of the laser is nonlinear, as described in the equation I = P m , where I is the UC emission intensity, P is the power of the exciting laser, and m is the number of photons [ 31 ].…”

“…A similar phenomenon has also be reported in Ce + -do TiO2:Yb,Er films and Gd 3+ -doped ErYbGdTiO composite nanophosphor [31,32]. In a tion, the relationship between UC intensity and exciting power of the laser is nonli as described in the equation I = P m , where I is the UC emission intensity, P is the pow the exciting laser, and m is the number of photons [31]. As shown in Figure 4d, the s The PL spectrum of the doped films are shown in Figure 4a under excitation with a 980 nm laser at a laser power of 1000 mW.…”